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• What's the value of a Facebook fan?

  - by David Dorf

  In his blog posting titled "Why Each Facebook Fan Is Worth $2,000 to J. Crew," Joe Skorupa lays out a simplistic calculation for assigning a value to social media efforts within Facebook. While I don't believe the metric, at least its a metric that can be applied consistently. Trying to explain the ROI to management to start a program, then benchmarking to show progress isn't straightforward at all. Social media isn't really mature enough to have hard-and-fast rules around valuation (yet). When I'm asked by retailers how to measure social media efforts, I usually fess-up and say I can't show an ROI but the investment is so low you might was well take a risk. Intuitively, it just seems like a good way to interact with consumers, and since your competition is doing it, you better do it as well. Vitrue, a social media management company, has calculated a fan as being worth $3.60 per year based on impressions generated in Facebook's news feed. That means a fan base of 1 million translates into at least $3.6 million in equivalent media over a year. Don't believe that number either? Fine, Vitrue now has a tool that let's you adjust the earned media value of a fan. Jump over to http://evaluator.vitrue.com/ and enter your brand's Facebook URL to get an assessment of the current value and potential value. For fun, I compared Abercrombie & Fitch (1,077,480 fans), Gap (567,772 fans), and Wet Seal (294,479 fans). The image below shows the results assuming the default $5 earned media value for a fan. The calculation is more complicated than just counting fans. It also accounts for postings and comments. Its possible for a brand with fewer fans to have a higher value based on frequency and relevancy of posts. The tool gathers data via the Social Graph API for the past 30 days of activity. I'm not sure this tool assigns the correct value either, but hey, its a great start.

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• What's up with LDoms: Part 1 - Introduction & Basic Concepts

  - by Stefan Hinker

  LDoms - the correct name is Oracle VM Server for SPARC - have been around for quite a while now.  But to my surprise, I get more and more requests to explain how they work or to give advise on how to make good use of them.  This made me think that writing up a few articles discussing the different features would be a good idea.  Now - I don't intend to rewrite the LDoms Admin Guide or to copy and reformat the (hopefully) well known "Beginners Guide to LDoms" by Tony Shoumack from 2007.  Those documents are very recommendable - especially the Beginners Guide, although based on LDoms 1.0, is still a good place to begin with.  However, LDoms have come a long way since then, and I hope to contribute to their adoption by discussing how they work and what features there are today.  In this and the following posts, I will use the term "LDoms" as a common abbreviation for Oracle VM Server for SPARC, just because it's a lot shorter and easier to type (and presumably, read). So, just to get everyone on the same baseline, lets briefly discuss the basic concepts of virtualization with LDoms.  LDoms make use of a hypervisor as a layer of abstraction between real, physical hardware and virtual hardware.  This virtual hardware is then used to create a number of guest systems which each behave very similar to a system running on bare metal:  Each has its own OBP, each will install its own copy of the Solaris OS and each will see a certain amount of CPU, memory, disk and network resources available to it.  Unlike some other type 1 hypervisors running on x86 hardware, the SPARC hypervisor is embedded in the system firmware and makes use both of supporting functions in the sun4v SPARC instruction set as well as the overall CPU architecture to fulfill its function. The CMT architecture of the supporting CPUs (T1 through T4) provide a large number of cores and threads to the OS.  For example, the current T4 CPU has eight cores, each running 8 threads, for a total of 64 threads per socket.  To the OS, this looks like 64 CPUs.  The SPARC hypervisor, when creating guest systems, simply assigns a certain number of these threads exclusively to one guest, thus avoiding the overhead of having to schedule OS threads to CPUs, as do typical x86 hypervisors.  The hypervisor only assigns CPUs and then steps aside.  It is not involved in the actual work being dispatched from the OS to the CPU, all it does is maintain isolation between different guests. Likewise, memory is assigned exclusively to individual guests.  Here,  the hypervisor provides generic mappings between the physical hardware addresses and the guest's views on memory.  Again, the hypervisor is not involved in the actual memory access, it only maintains isolation between guests. During the inital setup of a system with LDoms, you start with one special domain, called the Control Domain.  Initially, this domain owns all the hardware available in the system, including all CPUs, all RAM and all IO resources.  If you'd be running the system un-virtualized, this would be what you'd be working with.  To allow for guests, you first resize this initial domain (also called a primary domain in LDoms speak), assigning it a small amount of CPU and memory.  This frees up most of the available CPU and memory resources for guest domains.  IO is a little more complex, but very straightforward.  When LDoms 1.0 first came out, the only way to provide IO to guest systems was to create virtual disk and network services and attach guests to these services.  In the meantime, several different ways to connect guest domains to IO have been developed, the most recent one being SR-IOV support for network devices released in version 2.2 of Oracle VM Server for SPARC. I will cover these more advanced features in detail later.  For now, lets have a short look at the initial way IO was virtualized in LDoms: For virtualized IO, you create two services, one "Virtual Disk Service" or vds, and one "Virtual Switch" or vswitch.  You can, of course, also create more of these, but that's more advanced than I want to cover in this introduction.  These IO services now connect real, physical IO resources like a disk LUN or a networt port to the virtual devices that are assigned to guest domains.  For disk IO, the normal case would be to connect a physical LUN (or some other storage option that I'll discuss later) to one specific guest.  That guest would be assigned a virtual disk, which would appear to be just like a real LUN to the guest, while the IO is actually routed through the virtual disk service down to the physical device.  For network, the vswitch acts very much like a real, physical ethernet switch - you connect one physical port to it for outside connectivity and define one or more connections per guest, just like you would plug cables between a real switch and a real system. For completeness, there is another service that provides console access to guest domains which mimics the behavior of serial terminal servers. The connections between the virtual devices on the guest's side and the virtual IO services in the primary domain are created by the hypervisor.  It uses so called "Logical Domain Channels" or LDCs to create point-to-point connections between all of these devices and services.  These LDCs work very similar to high speed serial connections and are configured automatically whenever the Control Domain adds or removes virtual IO. To see all this in action, now lets look at a first example.  I will start with a newly installed machine and configure the control domain so that it's ready to create guest systems. In a first step, after we've installed the software, let's start the virtual console service and downsize the primary domain.  root@sun # ldm list NAME STATE FLAGS CONS VCPU MEMORY UTIL UPTIME primary active -n-c-- UART 512 261632M 0.3% 2d 13h 58m root@sun # ldm add-vconscon port-range=5000-5100 \ primary-console primary root@sun # svcadm enable vntsd root@sun # svcs vntsd STATE STIME FMRI online 9:53:21 svc:/ldoms/vntsd:default root@sun # ldm set-vcpu 16 primary root@sun # ldm set-mau 1 primary root@sun # ldm start-reconf primary root@sun # ldm set-memory 7680m primary root@sun # ldm add-config initial root@sun # shutdown -y -g0 -i6 So what have I done: I've defined a range of ports (5000-5100) for the virtual network terminal service and then started that service.  The vnts will later provide console connections to guest systems, very much like serial NTS's do in the physical world. Next, I assigned 16 vCPUs (on this platform, a T3-4, that's two cores) to the primary domain, freeing the rest up for future guest systems.  I also assigned one MAU to this domain.  A MAU is a crypto unit in the T3 CPU.  These need to be explicitly assigned to domains, just like CPU or memory.  (This is no longer the case with T4 systems, where crypto is always available everywhere.) Before I reassigned the memory, I started what's called a "delayed reconfiguration" session.  That avoids actually doing the change right away, which would take a considerable amount of time in this case.  Instead, I'll need to reboot once I'm all done.  I've assigned 7680MB of RAM to the primary.  That's 8GB less the 512MB which the hypervisor uses for it's own private purposes.  You can, depending on your needs, work with less.  I'll spend a dedicated article on sizing, discussing the pros and cons in detail. Finally, just before the reboot, I saved my work on the ILOM, to make this configuration available after a powercycle of the box.  (It'll always be available after a simple reboot, but the ILOM needs to know the configuration of the hypervisor after a power-cycle, before the primary domain is booted.) Now, lets create a first disk service and a first virtual switch which is connected to the physical network device igb2. We will later use these to connect virtual disks and virtual network ports of our guest systems to real world storage and network. root@sun # ldm add-vds primary-vds root@sun # ldm add-vswitch net-dev=igb2 switch-primary primary You are free to choose whatever names you like for the virtual disk service and the virtual switch.  I strongly recommend that you choose names that make sense to you and describe the function of each service in the context of your implementation.  For the vswitch, for example, you could choose names like "admin-vswitch" or "production-network" etc. This already concludes the configuration of the control domain.  We've freed up considerable amounts of CPU and RAM for guest systems and created the necessary infrastructure - console, vts and vswitch - so that guests systems can actually interact with the outside world.  The system is now ready to create guests, which I'll describe in the next section. For further reading, here are some recommendable links: The LDoms 2.2 Admin Guide The "Beginners Guide to LDoms" The LDoms Information Center on MOS LDoms on OTN

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• Clustering Basics and Challenges

  - by Karoly Vegh

  For upcoming posts it seemed to be a good idea to dedicate some time for cluster basic concepts and theory. This post misses a lot of details that would explode the articlesize, should you have questions, do not hesitate to ask them in the comments.  The goal here is to get some concepts straight. I can't promise to give you an overall complete definitions of cluster, cluster agent, quorum, voting, fencing, split brain condition, so the following is more of an explanation. Here we go. -------- Cluster, HA, failover, switchover, scalability -------- An attempted definition of a Cluster: A cluster is a set (2+) server nodes dedicated to keep application services alive, communicating through the cluster software/framework with eachother, test and probe health status of servernodes/services and with quorum based decisions and with switchover/failover techniques keep the application services running on them available. That is, should a node that runs a service unexpectedly lose functionality/connection, the other ones would take over the and run the services, so that availability is guaranteed. To provide availability while strictly sticking to a consistent clusterconfiguration is the main goal of a cluster.  At this point we have to add that this defines a HA-cluster, a High-Availability cluster, where the clusternodes are planned to run the services in an active-standby, or failover fashion. An example could be a single instance database. Some applications can be run in a distributed or scalable fashion. In the latter case instances of the application run actively on separate clusternodes serving servicerequests simultaneously. An example for this version could be a webserver that forwards connection requests to many backend servers in a round-robin way. Or a database running in active-active RAC setup.  -------- Cluster arhitecture, interconnect, topologies -------- Now, what is a cluster made of? Servers, right. These servers (the clusternodes) need to communicate. This of course happens over the network, usually over dedicated network interfaces interconnecting all the clusternodes. These connection are called interconnects.How many clusternodes are in a cluster? There are different cluster topologies. The most simple one is a clustered pair topology, involving only two clusternodes:  There are several more topologies, clicking the image above will take you to the relevant documentation. Also, to answer the question Solaris Cluster allows you to run up to 16 servers in a cluster. Where shall these clusternodes be placed? A very important question. The right answer is: It depends on what you plan to achieve with the cluster. Do you plan to avoid only a server outage? Then you can place them right next to eachother in the datacenter. Do you need to avoid DataCenter outage? In that case of course you should place them at least in different fire zones. Or in two geographically distant DataCenters to avoid disasters like floods, large-scale fires or power outages. We call this a stretched- or campus cluster, the clusternodes being several kilometers away from eachother. To cover really large distances, you probably need to move to a GeoCluster, which is a different kind of animal.  What is a geocluster? A Geographic Cluster in Solaris Cluster terms is actually a metacluster between two, separate (locally-HA) clusters.  -------- Cluster resource types, agents, resources, resource groups -------- So how does the cluster manage my applications? The cluster needs to start, stop and probe your applications. If you application runs, the cluster needs to check regularly if the application state is healthy, does it respond over the network, does it have all the processes running, etc. This is called probing. If the cluster deems the application is in a faulty state, then it can try to restart it locally or decide to switch (stop on node A, start on node B) the service. Starting, stopping and probing are the three actions that a cluster agent does. There are many different kinds of agents included in Solaris Cluster, but you can build your own too. Examples are an agent that manages (mounts, moves) ZFS filesystems, or the Oracle DB HA agent that cares about the database, or an agent that moves a floating IP address between nodes. There are lots of other agents included for Apache, Tomcat, MySQL, Oracle DB, Oracle Weblogic, Zones, LDoms, NFS, DNS, etc.We also need to clarify the difference between a cluster resource and the cluster resource group.A cluster resource is something that is managed by a cluster agent. Cluster resource types are included in Solaris cluster (see above, e.g. HAStoragePlus, HA-Oracle, LogicalHost). You can group cluster resources into cluster resourcegroups, and switch these groups together from one node to another. To stick to the example above, to move an Oracle DB service from one node to another, you have to switch the group between nodes, and the agents of the cluster resources in the group will do the following:  On node A Shut down the DB Unconfigure the LogicalHost IP the DB Listener listens on unmount the filesystem   Then, on node B: mount the FS configure the IP  startup the DB -------- Voting, Quorum, Split Brain Condition, Fencing, Amnesia -------- How do the clusternodes agree upon their action? How do they decide which node runs what services? Another important question. Running a cluster is a strictly democratic thing.Every node has votes, and you need the majority of votes to have the deciding power. Now, this is usually no problem, clusternodes think very much all alike. Still, every action needs to be governed upon in a productive system, and has to be agreed upon. Agreeing is easy as long as the clusternodes all behave and talk to eachother over the interconnect. But if the interconnect is gone/down, this all gets tricky and confusing. Clusternodes think like this: "My job is to run these services. The other node does not answer my interconnect communication, it must be down. I'd better take control and run the services!". The problem is, as I have already mentioned, clusternodes very much think alike. If the interconnect is gone, they all assume the other node is down, and they all want to mount the data backend, enable the IP and run the database. Double IPs, double mounts, double DB instances - now that is trouble. Also, in a 2-node cluster they both have only 50% of the votes, that is, they themselves alone are not allowed to run a cluster.  This is where you need a quorum device. According to Wikipedia, the "requirement for a quorum is protection against totally unrepresentative action in the name of the body by an unduly small number of persons.". They need additional votes to run the cluster. For this requirement a 2-node cluster needs a quorum device or a quorum server. If the interconnect is gone, (this is what we call a split brain condition) both nodes start to race and try to reserve the quorum device to themselves. They do this, because the quorum device bears an additional vote, that could ensure majority (50% +1). The one that manages to lock the quorum device (e.g. if it's an FC LUN, it SCSI reserves it) wins the right to build/run a cluster, the other one - realizing he was late - panics/reboots to ensure the cluster config stays consistent.  Losing the interconnect isn't only endangering the availability of services, but it also endangers the cluster configuration consistence. Just imagine node A being down and during that the cluster configuration changes. Now node B goes down, and node A comes up. It isn't uptodate about the cluster configuration's changes so it will refuse to start a cluster, since that would lead to cluster amnesia, that is the cluster had some changes, but now runs with an older cluster configuration repository state, that is it's like it forgot about the changes.  Also, to ensure application data consistence, the clusternode that wins the race makes sure that a server that isn't part of or can't currently join the cluster can access the devices. This procedure is called fencing. This usually happens to storage LUNs via SCSI reservation.  Now, another important question: Where do I place the quorum disk?  Imagine having two sites, two separate datacenters, one in the north of the city and the other one in the south part of it. You run a stretched cluster in the clustered pair topology. Where do you place the quorum disk/server? If you put it into the north DC, and that gets hit by a meteor, you lose one clusternode, which isn't a problem, but you also lose your quorum, and the south clusternode can't keep the cluster running lacking the votes. This problem can't be solved with two sites and a campus cluster. You will need a third site to either place the quorum server to, or a third clusternode. Otherwise, lacking majority, if you lose the site that had your quorum, you lose the cluster. Okay, we covered the very basics. We haven't talked about virtualization support, CCR, ClusterFilesystems, DID devices, affinities, storage-replication, management tools, upgrade procedures - should those be interesting for you, let me know in the comments, along with any other questions. Given enough demand I'd be glad to write a followup post too. Now I really want to move on to the second part in the series: ClusterInstallation.  Oh, as for additional source of information, I recommend the documentation: http://docs.oracle.com/cd/E23623_01/index.html, and the OTN Oracle Solaris Cluster site: http://www.oracle.com/technetwork/server-storage/solaris-cluster/index.html

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• Evolution email forgets all settings after reboot

  - by jbrendel

  My Evolution email client keeps forgetting all settings after a reboot or even a logout/login! Please help! I have recently installed Ubuntu 12.04 on a new laptop. To move my Evolution settings and email over to the new machine, I selected "backup", which creates a single tar.gz archive of all Evolution settings and mail. I copied the file to the new computer, started Evolution which presented me with the startup assistant. I selected 'restore from backup', pointed at the tar.gz file and all was beautifully restored. All seemed to work just fine. However, after a reboot I noticed that Evolution seems to have forgotten all settings: I get the startup assistant again when I start Evolution. I checked that the .conf/evolution and .local/share/evolution directories were still present, yet, none of that seemed to matter, it wanted me to restore from a backup again. The version of Ubuntu (12.04) and Evolution (3.2.3) are the same on the old and new laptop. Just stopping and restarting Evolution does not cause this problem. Even if I manually kill all Evolution related processes, the settings will be remembered and it can start up no problem. The problem only happens on logout/login or reboot. Any help is greatly appreciated! Thank you very much!

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• very long boot up with Ubuntu 10.04.4

  - by wt70707

  I installed Ubuntu 10.04.3 on Atom. Then I do the update and upgrade with: #apt-get update #apt-get upgrade #apt-get dist-upgrade The system can boot up now but in almost 2 minutes. After power on and system test, it will stop at "Verifying DMI pool data" for 10 seconds before the GRUB menu comes up. Then after the choosing of one item, to the start up of OS there is 100 seconds of black screen. The start up after that is normal and the operations in the system is also normal. I am concerned with if it is of hardware problem, or just some problem with the kernel. Also I want to know after "Verifying DMI pool data" what is done? And after we choose an item in GRUB menu, what does the system do? And where can I see the procedure of the whole boot up? The /var/log/boot.log is too simple, and this is it: fsck from util-linux-ng 2.17.2 fsck from util-linux-ng 2.17.2 /dev/mmcblk0p5: clean, ...... /dev/mmcblk0p1: clean, ...... * Starting AppArmor profiles Skipping profile in /etc/apparmor.d/disable: usr.bin.firefox OK] * Setting sensors limits OK]

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• TFS Build 2010: BuildNumber and DropLocation

  - by javarg

  Automatic Builds for Application Release is a current practice in every major development factory nowadays. Using Team Foundation Server Build 2010 to accomplish this offers many opportunities to improve quality of your releases. The following approach allow us to generate build drop folders including the BuildNumber and the Changeset or Label provided. Using this procedure we can quickly identify the generated binaries in the Drop Server with the corresponding Version. Branch the DefaultTemplate.xaml and renamed it with CustomDefaultTemplate.xaml Open it for edit (check out) Go to the Set Drop Location Activity and edit the DropLocation property. Write the following expression: BuildDetail.DropLocationRoot + "\" + BuildDetail.BuildDefinition.Name + "\" + If(String.IsNullOrWhiteSpace(GetVersion), BuildDetail.SourceGetVersion, GetVersion) + "_" + BuildDetail.BuildNumber Check in the branched template. Now create a build definition named TestBuildForDev using the new template. The previous expression sets the DropLocation with the following format: (ChangesetNumber|LabelName)_BuildName_BuildNumber The first part of the folder name will be the changeset number or the label name (if triggered using labels). Folder names will be generated as following: C1850_TestBuildForDev_20111117.1 (changesets start with letter C) LLabelname_TestBuildForDev_20111117.1 (labels start with letter L) Try launching a build from a Changeset and from a Label. You can specify a Label in the GetVersion parameter in the Queue new Build Wizard, going to the Parameters tab (for labels add the “L” prefix):

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• On contract work, obligations to said contract, and looking out for yourself…

  - by jlnorsworthy

  Without boring you all with details, my last two contract assignments were cut short; I was given 3 days notice on one, and 4 weeks notice on the other. Neither of these were due to performance – they both basically came down budget issues. On my second contract, I got the feeling that I may not have been a great place to stay for the duration of my contract. Because of money/time spent getting me in the door, and the possible negative effect of my employer/recruiter, I decided to stay at least for a few months (and start looking several weeks before the end of my supposedly “extendable” contract). These experiences have left me a little wary of contract work. It seems that if I land a bad contract, that my recruiter would take a hit (reputation or otherwise) if I quickly found another job. But on the other hand, the client company won’t think twice of ending the contract early for any reason. I know that the counter argument to this is “maybe your recruiter shouldn’t have put you into a crappy assignment”… either way, it seems that since I am relying on him to provide me with work, that I should try to not damage his reputation with client companies. I’m basically brand new to contracting (these were my first two contracts) so these concerns are new to me. TLDR: Is contract work, by its very nature, largely unstable? Am I worried too much about my recruiter? Should I be quicker to start looking for a new job even after just weeks at a new company (when the environment seems unstable)? If so, do I look through my recruiter or just find another position by any means necessary?

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• Business guy building a software company [closed]

  - by Dreamer

  I am a business guy who is about to embark on a very risky journey to start this own software company. I have done sales for several software companies and in the last 8 years, I have managed to generate over $15 million in pure SAAS revenues for my employers. I think now its time to do it for myself and see where I can take the business. I have an idea in mind which I would like to develop and have been speaking with several companies who I may hire to convert that idea into a SAAS based offering. I am scared of the following: Being ripped off as I have no technical knowledge Over-charged Building something and realizing the foundation was weak, not scalable etc. Can anyone help me identify what I need to do before I sign a software development company to start my project. What do I need to know? What is the typical cost? What is a realistic time frame? Which coding language is better? What steps can I take to prevent myself from being ripped-off?

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• unable to load nvidia(bumblebee) in ubuntu 14.04 (only nouveau loads)

  - by Ubuntuser

  Bumblebee stopped working on my system after upgrading to stable version of Ubuntu 14.04. DUring installation I get this error rmmod: ERROR: Module nouveau is in use Setting up bumblebee (3.2.1-90~trustyppa1) ... Selecting 01:00:0 as discrete nvidia card. If this is incorrect, edit the BusID line in /etc/bumblebee/xorg.conf.nouveau . bumblebeed start/running, process 11133 Processing triggers for initramfs-tools (0.103ubuntu4.1) ... update-initramfs: Generating /boot/initrd.img-3.14.1-031401-generic Setting up bumblebee-nvidia (3.2.1-90~trustyppa1) ... Selecting 01:00:0 as discrete nvidia card. If this is incorrect, edit the BusID line in /etc/bumblebee/xorg.conf.nvidia rmmod: ERROR: Module nouveau is in use bumblebeed start/running, process 18284 It says nouveau is in use. I checked the loaded modules lsmod | grep nouveau nouveau 1097199 1 mxm_wmi 13021 1 nouveau ttm 85115 1 nouveau i2c_algo_bit 13413 2 i915,nouveau drm_kms_helper 52758 2 i915,nouveau drm 302817 7 ttm,i915,drm_kms_helper,nouveau wmi 19177 3 dell_wmi,mxm_wmi,nouveau video 19476 2 i915,nouveau However, I have nouveau in my blacklist cat /etc/modprobe.d/blacklist.conf | grep nouveau blacklist nouveau blacklist lbm-nouveau alias nouveau off alias lbm-nouveau off My grub is also set to nomodeset cat /etc/default/grub | grep nomodeset GRUB_CMDLINE_LINUX_DEFAULT="nomodeset quiet splash" My graphics card is nvidia optimus lspci | grep -i vga 00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 18) 01:00.0 VGA compatible controller: NVIDIA Corporation GT218M [GeForce 310M] (rev ff) I've raised a bug in launchpad: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1327598 Note: Nvidia-prime is working for me (partially). Frequent mouse locks. Interestingly, bumblebee works perfectly fine on my fedora 20 partition on this same laptop.

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• unable to install anything that depends upon spamassassin. Cant even install spamassasin

  - by Harbhag

  I am trying to install mailscanner using apt-get install mailscanner and I got the following error Setting up spamassassin (3.3.1-1) ... Starting SpamAssassin Mail Filter Daemon: child process [21344] exited or timed out without signaling production of a PID file: exit 255 at /usr/sbin/spamd line 2588. invoke-rc.d: initscript spamassassin, action "start" failed. dpkg: error processing spamassassin (--configure): subprocess installed post-installation script returned error exit status 255 dpkg: dependency problems prevent configuration of mailscanner: mailscanner depends on spamassassin (>= 3.1); however: Package spamassassin is not configured yet. dpkg: error processing mailscanner (--configure): dependency problems - leaving unconfigured No apport report written because the error message indicates its a followup error from a previous failure. Errors were encountered while processing: spamassassin mailscanner E: Sub-process /usr/bin/dpkg returned an error code (1) and when I tried to install spamassassin I got the following error : Setting up spamassassin (3.3.1-1) ... Starting SpamAssassin Mail Filter Daemon: child process [21389] exited or timed out without signaling production of a PID file: exit 255 at /usr/sbin/spamd line 2588. invoke-rc.d: initscript spamassassin, action "start" failed. dpkg: error processing spamassassin (--configure): subprocess installed post-installation script returned error exit status 255 dpkg: dependency problems prevent configuration of mailscanner: mailscanner depends on spamassassin (>= 3.1); however: Package spamassassin is not configured yet. dpkg: error processing mailscanner (--configure): dependency problems - leaving unconfigured No apport report written because the error message indicates its a followup error from a previous failure. Errors were encountered while processing: spamassassin mailscanner E: Sub-process /usr/bin/dpkg returned an error code (1) I am using Ubuntu Server 10.04

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• The art of Unit Testing with Examples in .NET

  - by outcoldman

  First time when I familiarized with unit testing was 5 or 6 years ago. It was start of my developing career. I remember that somebody told me about code coverage. At that time I didn’t write any Unit tests. Guy, who was my team lead, told me “Do you see operator if with three conditions? You should check all of these conditions”. So, after that I had written some code, I should go to interface and try to invoke all code which I wrote from user interface. Nice? At current time I know little more about tests and unit testing. I have not participated in projects, designed by Test Driven Development (TDD). Basics of my knowledge are a spying code of my colleagues, some articles and screencasts. I had decide that I should know much more, and became a real professional of unit testing, this is why I had start to read book The art of Unit Testing with Examples in .NET. More than, in my current job place looks like I’m just one who writing unit tests for my code. I should show good examples of my tests. ,a href="http://outcoldman.ru/en/blog/show/267"Read more...

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• SQL SERVER – Migration Assistant Upgraded to Support SQL Server 2014

  - by Pinal Dave

  We all start somewhere when it is about database. There are different reasons, why we go for one database over another database. Usually the reason is cost and convenience. After a period of time when business is successful and traffic is growing, the same two reasons of cost and convenience start to become secondary goals. I have seen quite a lot of companies starting with free databases and after a while switching to another database as they want stability and service from the product company. Microsoft has an excellent product which lets you migrate your database from the alternate database to SQL Server. It is called SQL Server Migration Assistant (SSMA) and earlier this week, it has been upgraded to support SQL Server 2014. Now you can migrate from your database to to all editions of SQL Server 2005, SQL Server 2008, SQL Server 2008 R2, SQL Server 2012 and SQL Server 2014. SQL Server Migration Assistant (SSMA) is a free supported tool from Microsoft. Here is where you can download SSMA v5.3 for various databases. Microsoft SQL Server Migration Assistant v5.3 for Access Microsoft SQL Server Migration Assistant (SSMA) for Access is a tool to automate migration from Microsoft Access database(s) to SQL Server Microsoft SQL Server Migration Assistant v5.3 for Oracle Microsoft SQL Server Migration Assistant (SSMA) for Oracle is a tool to automate migration from Oracle database to SQL Server. Microsoft SQL Server Migration Assistant v5.3 for Sybase Microsoft SQL Server Migration Assistant (SSMA) for Sybase is a tool to automate migration from Sybase ASE database to SQL Server. Microsoft SQL Server Migration Assistant v5.3 for MySQL Microsoft SQL Server Migration Assistant (SSMA) for MySQL is a tool to automate migration from MySQL database to SQL Server. Reference: Pinal Dave (http://blog.sqlauthority.com)Filed under: MySQL, PostADay, SQL, SQL Authority, SQL Documentation, SQL Download, SQL Query, SQL Server, SQL Tips and Tricks, T SQL

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• ext4 jbd2 journaling active even on empty filesystem

  - by Paul

  I have been having several issues with my ext4 filesystems that seem to be due to jbd2 journaling. I made a related post here and am rephrasing it with the hope that someone may be able to help. For a minimal example, I start with an empty 8gb USB stick and use gparted to create one ext4 partition. The command used by gparted when creating the ext4 file system is: mkfs.ext4 -j -O extent -L DataTraveler8gb /dev/sde1 I check the filesystem with gparted: e2fsck -f -y -v /dev/sde1 and I mount it: sudo mount /dev/sde1 /media/test The disk is empty, but the journaling is very active on this disk (/dev/sde1). The other disks are ext4 SSDs formatted similarly. A snapshot of iotop: % sudo iotop -oPa Total DISK READ: 0.00 B/s | Total DISK WRITE: 2027.21 K/s PID PRIO USER DISK READ DISK WRITE SWAPIN IO COMMAND 262 be/3 root 0.00 B 56.00 K 0.00 % 0.18 % [jbd2/sda1-8] 29069 be/3 root 0.00 B 0.00 B 0.00 % 0.16 % [jbd2/sde1-8] 891 be/3 root 0.00 B 4.00 K 0.00 % 0.03 % [jbd2/sdc1-8] What is jbd2 doing with /dev/sde1? If I follow the same steps with a larger 2Tb disk, iotop indicates this empty disk is constantly being written to by jbd2 at the rate of Mb/s as soon as I mount it. On the other disks, which have the OS and /home, I have tried to find if any files are being modified by processes to cause this behavior but couldn't find any. I also moved many of the disk intensive process to use a tmpfs. And used noatime. I have another non-SSD hard disk on this machine, /dev/sdb, that is also ext4 but was not formatted by gparted (given to me by a coworker). It does not appear in iotop. So I am assuming there an issue with gparted. Any suggestions are appreciated. Also any tips on how to modify existing partitions to fix the issue without having to start from scratch would be great. There are some posts related to jbd2 but they didn't help (eg. here).

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• SQL SERVER – Determine if SSRS 2012 is Installed on your SQL Server

  - by Pinal Dave

  This example is from the Beginning SSRS by Kathi Kellenberger. Supporting files are available with a free download from the www.Joes2Pros.com web site. Determine if SSRS 2012 is Installed on your SQL Server You may already have SSRS, or you may need to install it. Before doing any installation it makes sense to know where you are now. If you happened to install SQL Server with all features, you have the tools you need. There are two tools you need: SQL Server Data Tools and Reporting Services installed in Native Mode. To find out if SQL Server Data Tools (SSDT) is installed, click the Start button, go to All Programs, and expand SQL Server 2012. Look for SQL Server Data Tools   Now, let’s check to see if SQL Server Reporting Services is installed. Click the Start > All Programs > SQL Server 2012 > Configuration Tools > SQL > Server Configuration Manager   Once Configuration Manager is running, select SQL Server Services. Look for SQL Server Reporting Services in the list of services installed. If you have both SQL Server Reporting Services service and SQL Server Developer tools installed, you will not have to install them again. You may have SQL Server installed, but are missing the Data Tools or the SSRS service or both. In tomorrow blog post we will go over how to install based on where you are now.   Tomorrow’s Post Tomorrow’s blog post will show how to install and configure SSRS. If you want to learn SSRS in easy to simple words – I strongly recommend you to get Beginning SSRS book from Joes 2 Pros. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL Tagged: Reporting Services, SSRS

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• Why am I getting this "Connection to PulseAudio failed" error?

  - by Dave M G

  I have a computer that runs Mythbuntu 11.10. It has an external USB Kenwood Digital Audio device. When I open up pavucontrol, I get this message: If I do as the message suggests and run start-pulseaudio-x11, I get this output: $ start-pulseaudio-x11 Connection failure: Connection refused pa_context_connect() failed: Connection refused How do I correct this error? Update: Somewhere during the course of doing the suggested tests in the comments, a new audio device has now become visible in my sound settings. I have not attached or made any new device, so this must be the result of of some setting change. The device I use and know about is the Kenwood Audio device. The "GF108" device will play sound through the Kenwood anyway, but not reliably: Command line output as requested in the comments: $ ls -l ~/.pulse* -rw------- 1 mythbuntu mythbuntu 256 Feb 28 2011 /home/mythbuntu/.pulse-cookie /home/mythbuntu/.pulse: total 200 -rw-r--r-- 1 mythbuntu mythbuntu 8192 Oct 23 01:38 2b98330d36bf53bb85c97fc300000008-card-database.tdb -rw-r--r-- 1 mythbuntu mythbuntu 69 Nov 16 22:51 2b98330d36bf53bb85c97fc300000008-default-sink -rw-r--r-- 1 mythbuntu mythbuntu 68 Nov 16 22:51 2b98330d36bf53bb85c97fc300000008-default-source -rw-r--r-- 1 mythbuntu mythbuntu 49152 Oct 14 12:30 2b98330d36bf53bb85c97fc300000008-device-manager.tdb -rw-r--r-- 1 mythbuntu mythbuntu 61440 Oct 23 01:40 2b98330d36bf53bb85c97fc300000008-device-volumes.tdb lrwxrwxrwx 1 mythbuntu mythbuntu 23 Nov 16 22:50 2b98330d36bf53bb85c97fc300000008-runtime -> /tmp/pulse-EAwvLIQZn7e8 -rw-r--r-- 1 mythbuntu mythbuntu 77824 Nov 1 12:54 2b98330d36bf53bb85c97fc300000008-stream-volumes.tdb And yet more requested command line output: $ ps auxw|grep pulse 1000 2266 0.5 0.2 294184 9152 ? S<l Nov16 4:26 pulseaudio -D 1000 2413 0.0 0.0 94816 3040 ? S Nov16 0:00 /usr/lib/pulseaudio/pulse/gconf-helper 1000 4875 0.0 0.0 8108 908 pts/0 S+ 12:15 0:00 grep --color=auto pulse

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• Autoscaling in a modern world&hellip;. Part 1

  - by Steve Loethen

  It has been a while since I have had time to sit down and blog.  I need to make sure I take the time.  It helps me to focus on technology and not let the administrivia keep me from doing the things I love. I have been focusing on the cloud for the last couple of years.  Specifically the  PaaS platform from Microsoft called Azure.  Time to dig in.. I wanted to explore Autoscaling.  Autoscaling is not native part of Azure.  The platform has the needed connection points.  You can write code that looks at the health and performance of your application components and react to needed scaling changes.  But that means you have to write all the code.  Luckily, an add on to the Enterprise Library provides a lot of code that gets you a long way to being able to autoscale without having to start from scratch. The tool set is primarily composed of a Autoscaler object that you need to host.  This object, when hosted and configured, looks at the performance criteria you specify and adjusts your application based on your needs.  Sounds perfect. I started with the a set of HOL’s that gave me a good basis to understand the mechanics.  I worked through labs 1 and 2 just to get the feel, but let’s start our saga at the end of lab3.  Lab3 end results in a web application, hosted in Azure and a console app running on premise.  The web app has a few buttons on it.  One set adds messages to a queue, another removes them.  A second set of buttons drives processor utilization to 100%.  If you want to guess, a safe bet is that the Autoscaler is configured to react to a queue that has filled up or high cpu usage.  We will continue our saga in the next post…

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• crash when using wireless network

  - by Erik

  ubuntu 12.04 32 bit When I start up my system almost instantly freezes, I found that the problem lays with my wireless network, because the crash is always t the same time as the message that tells me I am connected to a network when I start up connected to a cable everything works fine, I can even see that I am connected to our wireless network, until I unplug the ethernet cable, then it all freezes again the same happened when I boot from a live cd (from usb) The problem only occurs on my netbook, my laptop doesn't give any problems. I don't know if anyone else has had similar problems, or if anyone knows a solution... Thanks in advance! greetings Erik EDIT (21/3/2012): it seems there is some external factor involved, I'm using my netbook for about 50 minutes now while connected to the wireless network, and still it didn't crash strange enough, before these 50 minutes I had to put it down by holding the power button, because I decided to try it again, that time it did crash... before (while connected with an ethernet cable) I've been trying to get my Bluetooth working, that didn't succeed entirely, but I guess that might be a factor in the question why it doesn't crash at the moment now I rebooted, connected, and no crash... if it crashes again, I'll update this post again. in the meantime, if anyone has an idea on what could be a factor, and on how to create a crash using that factor, feel free to ask!

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• Silverlight Cream for April 23, 2010 -- #845

  - by Dave Campbell

  In this Issue: Jason Allor, Bill Reiss, Mike Snow, Tim Heuer, John Papa, Jeremy Likness, and Dave Campbell. Shoutouts: You saw it at MIX10 and DevConnections... now you can give it a dance, John Papa announced eBay Simple Lister Beta Now Available Mike Snow posted some info about and a link to his new Flickr/Bing/Google High End Image Viewer and he's looking for feedback From SilverlightCream.com: Hierarchical Data Trees With A Custom DataSource Jason Allor is rounding out a series here in his new blog (bookmark it), and he's created his own custom HierarchicalDataSource class for use with the TreeView. Space Rocks game step 11: Start level logic Bill Reiss has Episode 11 up in his Space Rocks game ... working on NewGame and start level logic Silverlight Tip of the Day #3 – Mouse Right Clicks Mike Snow has Tip 3 up ... about handling right-mouse clicks in Silverlight 4 -- oh yeah, we got right mouse now ... grab Mike's project to check it out. Silverlight 4 enables Authorization header modification Tim Heuer talks about the ability to modify the Authorization header in network calls with Silverlight 4. He gives not only the quick-and-dirty of how to use it, but has some good examples, code, and code results for show and tell. WCF RIA Services - Hands On Lab John Papa built a bookstore app in roughly 10 minutes in the keynote at DevConnections. He now has a tutorial on doing just that plus all the code up. Transactions with MVVM Not strictly Silverlight (or WPF), but Jeremy Likness has an interesting article up on MVVM and transaction processing. Read the post then grab his helper class. Your First Windows Phone 7 Application As with the First Silverlight App a couple weeks ago, if you've got any WP7 experience at all, just keep going... this is for folks that have not looked at it yet, have not downloaded anything... oh, and it's by Dave Campbell Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight    Silverlight 3    Silverlight 4    Windows Phone MIX10

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• Personal | First Stop on our trip, St. Louis

  - by Jeff Julian

  St. Louis is definitely a cool city. I have always looked at it as Kansas City’s big brother. I love to Arch, wonder what is would be like to have pro hockey, really like the downtown area, and have some great friends who live there. The reason we left for St. Louis on Thursday evening was to get us a head start on our journey. Since we were doing a Diners, Drive-ins, and Dives tour, it made since to have the journey start there. We picked the Hyatt Downtown as our hotel because they had an Arch Package which was suppose to get you tickets to the arch so you didn’t need to arrive early and wait in line. That ended up not working cause the arch had been selling out every day and they were no longer accepting the hotels tickets. No biggie and the hotel did try very hard to get us tickets, but we just took our chances in the line and waited. We walked over to the park and had to wait for about 20 minutes for the doors to open and had tickets after another 20 minutes of waiting in line and at that point walked right up and were able to get to the elevators.I want to stop here to have a little aside. I don’t know who started the rumor that the arch ride is scary but it is not. You do sit in a small pod, but it like the accent on a roller coaster to the top of the first drop and an elevator with no windows outside. Nothing to be afraid of here if you aren’t claustrophobic. If you are afraid of small spaces, stay clear of this ride. Once you get to the top, you walk up 10 to 30 stairs depending on which car you were in (lower the number the less stairs you climb) and you are then at the top in a decent sized room where you look out the windows. Beautiful view of the city. I don’t typically like heights, but this felt like being inside a building and not hang out on a roof. Here is the view from the arch: Related Tags: Diners, Drive-ins, and Dives, St. Louis, Vacation

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• How to Omit the Page Number From the First Page of a Word 2013 Document Without Using Sections

  - by Lori Kaufman

  Normally, the first page, or cover page, of a document does not have a page number or other header or footer text. You can avoid putting a page number on the first page using sections, but there is an easier way to do this. If you don’t plan to use sections in any other part of your document, you may want to avoid using them completely. We will show you how to easily take the page number off the cover page and start the page numbering at one on the second page of your document by simply using a footer (or a header) and changing one setting. Click the Page Layout tab. In the Page Setup section of the Page Layout tab, click the Page Setup dialog box launcher icon in the lower, right corner of the section. On the Page Setup dialog box, click the Layout tab and select the Different first page check box in the Headers and footers section so there is a check mark in the box. Click OK. You’ll notice there is no page number on the first page of your document now. However, you might want the second page to be page one of your document, only to find it is currently page two. To change the page number on the second page to one, click the Insert tab. In the Header & Footer section of the Insert tab, click Page Number and select Format Page Numbers from the drop-down menu. On the Page Number Format dialog box, select Start at in the Page numbering section. Enter 0 in the edit box and click OK. This allows the second page of your document to be labeled as page one. You can use the drop-down menu on the Format Page Numbers button in the Header & Footer section of the Insert tab to add page numbers to your document as well. Easily insert formatted page numbers at the top or bottom of the page or in the page margins. Use the same menu to remove page numbers from your document.     

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• Visual Studio 2010 Service Pack 1, now available for download

  - by Harish Ranganathan

  Visual Studio 2010 Service Pack 1 (SP1) is now available for general download for almost a week now.  The Beta of SP1 came couple of months back and it did a lot of performance enhancements, added support for HTML5 tags and few other stuff related to web development.  Now, the final release of SP1 is available.  The good part is that, if you had installed the SP1 beta, you don’t have to remove the Beta and start all over again.  You can apply the final release on top of the Beta and it works like a charm. So, in simplified terms, what is new in Visual Studio 2010 SP1 Before I start listing it down, I was checking if there was an MSDN article available on this and found http://msdn.microsoft.com/en-us/library/gg442059.aspx  While it reads (Beta), the same holds good for the release candidate as well.  Unlike VS 2008 SP1 and .NET 3.5 SP1 (which came together), this release doesn’t add any new project templates/item templates. However, there are lot of enhancements related to Web Deployment, Debugging and Unit Testing for .NET 3.5 applications. So, how does one find if you are running the correct version of SP1 final release. While the SP1 Beta (Help – About Visual Studio) reads Microsoft Visual Studio 2010 Version 10.0.3118.1 SP1 Rel, once you install the SP1 RTM release, it should read as below The download link for SP1 Beta is here Cheers!!!

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• Building Simple Workflows in Oozie

  - by dan.mcclary

  Introduction More often than not, data doesn't come packaged exactly as we'd like it for analysis. Transformation, match-merge operations, and a host of data munging tasks are usually needed before we can extract insights from our Big Data sources. Few people find data munging exciting, but it has to be done. Once we've suffered that boredom, we should take steps to automate the process. We want codify our work into repeatable units and create workflows which we can leverage over and over again without having to write new code. In this article, we'll look at how to use Oozie to create a workflow for the parallel machine learning task I described on Cloudera's site. Hive Actions: Prepping for Pig In my parallel machine learning article, I use data from the National Climatic Data Center to build weather models on a state-by-state basis. NCDC makes the data freely available as gzipped files of day-over-day observations stretching from the 1930s to today. In reading that post, one might get the impression that the data came in a handy, ready-to-model files with convenient delimiters. The truth of it is that I need to perform some parsing and projection on the dataset before it can be modeled. If I get more observations, I'll want to retrain and test those models, which will require more parsing and projection. This is a good opportunity to start building up a workflow with Oozie. I store the data from the NCDC in HDFS and create an external Hive table partitioned by year. This gives me flexibility of Hive's query language when I want it, but let's me put the dataset in a directory of my choosing in case I want to treat the same data with Pig or MapReduce code. CREATE EXTERNAL TABLE IF NOT EXISTS historic_weather(column 1, column2) PARTITIONED BY (yr string) STORED AS ... LOCATION '/user/oracle/weather/historic'; As new weather data comes in from NCDC, I'll need to add partitions to my table. That's an action I should put in the workflow. Similarly, the weather data requires parsing in order to be useful as a set of columns. Because of their long history, the weather data is broken up into fields of specific byte lengths: x bytes for the station ID, y bytes for the dew point, and so on. The delimiting is consistent from year to year, so writing SerDe or a parser for transformation is simple. Once that's done, I want to select columns on which to train, classify certain features, and place the training data in an HDFS directory for my Pig script to access. ALTER TABLE historic_weather ADD IF NOT EXISTS PARTITION (yr='2010') LOCATION '/user/oracle/weather/historic/yr=2011'; INSERT OVERWRITE DIRECTORY '/user/oracle/weather/cleaned_history' SELECT w.stn, w.wban, w.weather_year, w.weather_month, w.weather_day, w.temp, w.dewp, w.weather FROM ( FROM historic_weather SELECT TRANSFORM(...) USING '/path/to/hive/filters/ncdc_parser.py' as stn, wban, weather_year, weather_month, weather_day, temp, dewp, weather ) w; Since I'm going to prepare training directories with at least the same frequency that I add partitions, I should also add that to my workflow. Oozie is going to invoke these Hive actions using what's somewhat obviously referred to as a Hive action. Hive actions amount to Oozie running a script file containing our query language statements, so we can place them in a file called weather_train.hql. Starting Our Workflow Oozie offers two types of jobs: workflows and coordinator jobs. Workflows are straightforward: they define a set of actions to perform as a sequence or directed acyclic graph. Coordinator jobs can take all the same actions of Workflow jobs, but they can be automatically started either periodically or when new data arrives in a specified location. To keep things simple we'll make a workflow job; coordinator jobs simply require another XML file for scheduling. The bare minimum for workflow XML defines a name, a starting point, and an end point: <workflow-app name="WeatherMan" xmlns="uri:oozie:workflow:0.1"> <start to="ParseNCDCData"/> <end name="end"/> </workflow-app> To this we need to add an action, and within that we'll specify the hive parameters Also, keep in mind that actions require <ok> and <error> tags to direct the next action on success or failure. <action name="ParseNCDCData"> <hive xmlns="uri:oozie:hive-action:0.2"> <job-tracker>localhost:8021</job-tracker> <name-node>localhost:8020</name-node> <configuration> <property> <name>oozie.hive.defaults</name> <value>/user/oracle/weather_ooze/hive-default.xml</value> </property> </configuration> <script>ncdc_parse.hql</script> </hive> <ok to="WeatherMan"/> <error to="end"/> </action> There are a couple of things to note here: I have to give the FQDN (or IP) and port of my JobTracker and NameNode. I have to include a hive-default.xml file. I have to include a script file. The hive-default.xml and script file must be stored in HDFS That last point is particularly important. Oozie doesn't make assumptions about where a given workflow is being run. You might submit workflows against different clusters, or have different hive-defaults.xml on different clusters (e.g. MySQL or Postgres-backed metastores). A quick way to ensure that all the assets end up in the right place in HDFS is just to make a working directory locally, build your workflow.xml in it, and copy the assets you'll need to it as you add actions to workflow.xml. At this point, our local directory should contain: workflow.xml hive-defaults.xml (make sure this file contains your metastore connection data) ncdc_parse.hql Adding Pig to the Ooze Adding our Pig script as an action is slightly simpler from an XML standpoint. All we do is add an action to workflow.xml as follows: <action name="WeatherMan"> <pig> <job-tracker>localhost:8021</job-tracker> <name-node>localhost:8020</name-node> <script>weather_train.pig</script> </pig> <ok to="end"/> <error to="end"/> </action> Once we've done this, we'll copy weather_train.pig to our working directory. However, there's a bit of a "gotcha" here. My pig script registers the Weka Jar and a chunk of jython. If those aren't also in HDFS, our action will fail from the outset -- but where do we put them? The Jython script goes into the working directory at the same level as the pig script, because pig attempts to load Jython files in the directory from which the script executes. However, that's not where our Weka jar goes. While Oozie doesn't assume much, it does make an assumption about the Pig classpath. Anything under working_directory/lib gets automatically added to the Pig classpath and no longer requires a REGISTER statement in the script. Anything that uses a REGISTER statement cannot be in the working_directory/lib directory. Instead, it needs to be in a different HDFS directory and attached to the pig action with an <archive> tag. Yes, that's as confusing as you think it is. You can get the exact rules for adding Jars to the distributed cache from Oozie's Pig Cookbook. Making the Workflow Work We've got a workflow defined and have collected all the components we'll need to run. But we can't run anything yet, because we still have to define some properties about the job and submit it to Oozie. We need to start with the job properties, as this is essentially the "request" we'll submit to the Oozie server. In the same working directory, we'll make a file called job.properties as follows: nameNode=hdfs://localhost:8020 jobTracker=localhost:8021 queueName=default weatherRoot=weather_ooze mapreduce.jobtracker.kerberos.principal=foo dfs.namenode.kerberos.principal=foo oozie.libpath=${nameNode}/user/oozie/share/lib oozie.wf.application.path=${nameNode}/user/${user.name}/${weatherRoot} outputDir=weather-ooze While some of the pieces of the properties file are familiar (e.g., JobTracker address), others take a bit of explaining. The first is weatherRoot: this is essentially an environment variable for the script (as are jobTracker and queueName). We're simply using them to simplify the directives for the Oozie job. The oozie.libpath pieces is extremely important. This is a directory in HDFS which holds Oozie's shared libraries: a collection of Jars necessary for invoking Hive, Pig, and other actions. It's a good idea to make sure this has been installed and copied up to HDFS. The last two lines are straightforward: run the application defined by workflow.xml at the application path listed and write the output to the output directory. We're finally ready to submit our job! After all that work we only need to do a few more things: Validate our workflow.xml Copy our working directory to HDFS Submit our job to the Oozie server Run our workflow Let's do them in order. First validate the workflow: oozie validate workflow.xml Next, copy the working directory up to HDFS: hadoop fs -put working_dir /user/oracle/working_dir Now we submit the job to the Oozie server. We need to ensure that we've got the correct URL for the Oozie server, and we need to specify our job.properties file as an argument. oozie job -oozie http://url.to.oozie.server:port_number/ -config /path/to/working_dir/job.properties -submit We've submitted the job, but we don't see any activity on the JobTracker? All I got was this funny bit of output: 14-20120525161321-oozie-oracle This is because submitting a job to Oozie creates an entry for the job and places it in PREP status. What we got back, in essence, is a ticket for our workflow to ride the Oozie train. We're responsible for redeeming our ticket and running the job. oozie -oozie http://url.to.oozie.server:port_number/ -start 14-20120525161321-oozie-oracle Of course, if we really want to run the job from the outset, we can change the "-submit" argument above to "-run." This will prep and run the workflow immediately. Takeaway So, there you have it: the somewhat laborious process of building an Oozie workflow. It's a bit tedious the first time out, but it does present a pair of real benefits to those of us who spend a great deal of time data munging. First, when new data arrives that requires the same processing, we already have the workflow defined and ready to run. Second, as we build up a set of useful action definitions over time, creating new workflows becomes quicker and quicker.

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• Wire Framing WP7 Apps With Cacoo

  - by Tim Murphy

  While looking for a free alternative to Sketchflow I landed on the Cacoo web site.  Any developer who decides to use the free Visual Studio tools may find themselves doing the same search.  The base functionality of Cacoo is free although there are certain features that have fees attached to them such as extended stencils and templates. Cacoo doesn’t seem to have a template for WP7.  It does have templates for iOS and Android development so I started with the Android template and started modidfying it for WP7.  Funny thing is since Android has the same hardware vendors as Windows Phone the basic frame looks just right (I would swear I was looking at my Samsung Focus). Below is the start of a new mockup for the user group that I help run. I found that while Cacoo doesn’t have all the icons I need I am able to insert them from the Windows Phone Toolkit folder.  If I put them off to the side as you can see above.  I can simply copy and paste them into the appropriate place as needed.  Beyond that I have customized the main frame frame so I can have my base to work from.  In the future I intend to create this as a stencil and if it looks good enough I would consider making it public. My use of this product is still in it’s early phase, but it seems like a great way to start.  Maybe if you use this to get going you can earn enough from your resulting apps to pay for something with more bells and whistles in the future. del.icio.us Tags: WP7,Windows Phone 7 development,design,Cacoo,wire frame

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• How to open a VirtualBox (.VDI) Virtual Machine

  - by [email protected]

   How to open a .VDI Virtual MachineSometimes someone share with us one Virtual machine with extension .VDI, after that we can wonder how and what with?Well the answer is... It is a VirtualBox - Virtual Machine. If you have not downloaded it you can do this easily, just follow this post.http://listeningoracle.blogspot.com/2010/04/que-es-virtualbox.htmlorhttp://oracleoforacle.wordpress.com/2010/04/14/ques-es-virtualbox/Ok, Now with VirtualBox Installed open it and proceed with the following:1. Open the Virtual File Manager. 2. Click on Actions ? Add and select the .VDI fileClick "Ok"3.  A new Virtual machine will be displayed, (in this Case, an OEL5 32GB Virtual Machine is available.)4. This step is important. Once you have open the settings, under General option click the advanced settings. Here you must change the default directory to save your Snapshots; my recommendation set it to the same directory where the .Vdi file is. Otherwise you can have the same Virtual Machine and its snapshots in different paths.5. Now Click on System, and proceed to assign the correct memory and define the processors for the Virtual machine. Note: Enable  "Enable IO APIC" if you are planning to assign more than one CPU to the Virtual Machine.6. Associated the storage disk to the Virtual machineThe disk must be selected as IDE Primary Master. 7. Well you can verify the other options, but with these changes you will be able to start the VM. Note: Sometime the VM owner may share some instructions, if so follow his instructions.8. Click Ok and Push Start Button, and enjoy your Virtual Machine

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• How to open a VirtualBox (.VDI) Virtual Machine

  - by [email protected]

   How to open a .VDI Virtual MachineSometimes someone share with us one Virtual machine with extension .VDI, after that we can wonder how and what with?Well the answer is... It is a VirtualBox - Virtual Machine. If you have not downloaded it you can do this easily, just follow this post.http://listeningoracle.blogspot.com/2010/04/que-es-virtualbox.htmlorhttp://oracleoforacle.wordpress.com/2010/04/14/ques-es-virtualbox/Ok, Now with VirtualBox Installed open it and proceed with the following:1. Open the Virtual File Manager. 2. Click on Actions ? Add and select the .VDI fileClick "Ok"3.  A new Virtual machine will be displayed, (in this Case, an OEL5 32GB Virtual Machine is available.)4. This step is important. Once you have open the settings, under General option click the advanced settings. Here you must change the default directory to save your Snapshots; my recommendation set it to the same directory where the .Vdi file is. Otherwise you can have the same Virtual Machine and its snapshots in different paths.5. Now Click on System, and proceed to assign the correct memory and define the processors for the Virtual machine. Note: Enable  "Enable IO APIC" if you are planning to assign more than one CPU to the Virtual Machine.6. Associated the storage disk to the Virtual machineThe disk must be selected as IDE Primary Master. 7. Well you can verify the other options, but with these changes you will be able to start the VM. Note: Sometime the VM owner may share some instructions, if so follow his instructions.8. Click Ok and Push Start Button, and enjoy your Virtual Machine

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