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• Accenture Foundation Platform for Oracle (AFPO) – Your pre-build & tested middleware platform

  - by JuergenKress

  The Accenture Foundation Platform for Oracle (AFPO) is a pre-built, tested reference application, common services framework and development accelerator for Oracle’s Fusion Middleware 11g product suite that can help to reduce development time and cost by up to 30 percent. AFPO is a unique accelerator that includes documentation, day one deliverables and quick start virtual machine images, along with access to a skilled team of resources, to reduce risk and cost while improving project quality. It can be delivered all at once or in stages, on-site, hosted, or as a cloud solution. Accenture recently released AFPO v5 for use with their clients. Accenture added significant updates in v5 including Day 1 images & documentation for Webcenter & ADF Mobile that are integrated with 30 other Oracle Middleware products that signifigantly reduced the services aspect to standing these products up. AFPO v5 also features rapid configuration and implementation capabilities for SOA/BPM integrated with Oracle WebCenter Portal, Oracle WebCenter Content, Oracle Business Intelligence, Oracle Identity Management and Oracle ADF Mobile.  AFPO v5 also delivers a starter kit for Oracle SOA Suite which builds upon the integration methodology, leading practices and extended tooling contained within the Oracle Foundation Pack. The combination of the AFPO starter kit and Foundation Pack jump-start and streamline Oracle SOA Suite implementation initiatives, helping to reduce the risk of deploying new technologies and making architectural decisions, so clients can ultimately reduce cost, risk and the time needed for an implementation.  You'll find more information at: Accenture's website:  www.accenture.com/afpo YouTube AFPO Telestration:  http://www.youtube.com/watch?v=_x429DcHEJs Press Release Brochure Contacts: [email protected] Patrick J Sullivan (Accenture – Global Oracle Technology Lead), [email protected] SOA & BPM Partner Community For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit  www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Mix Forum Technorati Tags: AFPO,Accenture,middleware platform,oracle middleware,SOA Community,Oracle SOA,Oracle BPM,Community,OPN,Jürgen Kress

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• links for 2011-02-02

  - by Bob Rhubart

  Oracle WebLogic's YouTube Channel Tired of reading? Watch and learn.  (tags: oracle weblogic youtube) Chris Muir: JDev: ADF BC and ADF Libraries: The Library Private property Oracle ACE Director Chris Muir illustrates the use of ADF Libraries. (tags: oracle otn oracleace) Satyajith Nair: Starting a SOA Project? Don't forget the Service Registry!! Satyajith Nair argues that "even with small projects, adding a Service Registry in the architecture has significant benefits with regards to Developer Productivity, Build Quality, Ease of maintenance and Architecture Flexibility." (tags: oracle infosys soa serviceregistry soagovernance) Matthias Wessendorf: Weblog Apache MyFaces in the cloud - Part II Matthias Wessendorf says: "A few days ago I did a quick test to see how well Apache MyFaces works in the cloud. The Amazon Beanstalk test was a success." (tags: oracle apache cloud) SOA & E2.0 Partner Community Forum - registration is open! (SOA Partner Community Blog) Jurgen Kress with an update on next month's event in the Netherlands. (tags: oracle otn soa enterprise2.0) Well Hello There, WebCenter PS3 VM | The AppsLab Jake Kuramoto says: "You may recall my struggle last year to assemble and document a WebCenter VM. Well, apparently other people thought it was a good idea..." (tags: oracle otn enterprise2.0 webcenter) InfoQ: Proving the Business Value of SOA Anne Thomas Manes discusses SOA goals and objectives used to measure a system’s success, measuring the business value, SOA project metrics, and recommendations on proving the business value of SOA. (tags: ping.fm) InfoQ: Amazon Will Offer Oracle Database 11g on RDS Amazon will offer Oracle Database 11g on RDS which brings patching, backup, replication, and failover support to Oracle’s database. (tags: ping.fm)

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• Prevent Looping and Inefficient Rule Executions by C2B2

  - by JuergenKress

  This recipe, taken from the recently published Oracle SOA Suite 11g Performance Cookbook gives guidance on how to avoid rule executions that will loop, potentially indefinitely! We’ll use an inbound XML fact and a local RL fact as an example. Getting ready You’ll need access to a SOA composite containing an Oracle Business Rules component in JDeveloper to apply this recipe. We’ll assume you have an XSD schema with an input type RequestInput containing input and bonus String types, and output String value called output in a type ResponseOutput. These aren’t efficient but serve as an example. We’ll step through adding a rule to a composite and creating an RL fact. How to do it... Open a SOA composite. Right click on the Project and select Business Rules (Service Components), use the search box if it is not immediately available. Give the rule a name and click the green plus icon to add the RequestInput to the input and ResponseOutput to the output types. Read the complete article here. SOA & BPM Partner Community For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Facebook Wiki Technorati Tags: C2B2,looping,SOA Community,Oracle SOA,Oracle BPM,Community,OPN,Jürgen Kress

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• How to start with Oracle BPM Suite

  - by JuergenKress

  Oracle Learning Library - BPM Webcasts on-demand Webcast: What’s new in Oracle BPM 11.1.1.7.0 & Webcast: New Directions with Business-Driven BPM BPM Videos Oracle Business Process Management - YouTube & Oracle BPM Suite 11g: Business Driven Modeling to Execution - Video & Customer Experience on your Mind? Think Oracle BPM - Video & Kick-Start BPM with Oracle Process Accelerators - Video Attend the free online training SOA Suite 11g Implementation Specialist & SOA Suite 11g Implementation Specialist & BPM Suite 11g Presales Specialist Pass the free online assessment BPM Suite 11g Presales Specialist Assessment Attend a BPM Bootcamp 3 days hands-on training free of charge for partners Take the exam BPM Suite 11g Certified Implementation Specialist Read the bpm blogs and bpm books from our BPM experts Additional resources BPM OTN Website Visit the Community Workspace (Community membership required) with the latest BPM training material, marketing kits and presentations Most important become a member in our SOA & BPM Partner Community here SOA & BPM Partner Community For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Facebook Wiki Mix Forum Technorati Tags: BPM,BPM training,training,education,BPM bootcamp,SOA Community,Oracle SOA,Oracle BPM,Community,OPN,Jürgen Kress

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• Fault Handling Slides and Q&A by Vennester

  - by JuergenKress

  Fault Handling It is one thing to architect, design, and code the “happy flow” of your automated business processes and services. It is another thing to deal with situations you do not want or expect to occur in your processes and services. This session dives into fault handling in Oracle Service Bus 11g and Oracle SOA Suite 11g, based on an order-to-cash business process. Faults can be divided into business faults, technical faults, programming errors, and faulty user input. Each type of fault needs a different approach to prevent them from occurring or to deal with them. For example, apply User Experience (UX) techniques to improve the quality of your application so that faulty user input can be prevented as much as possible. This session shows and demos what patterns and techniques can be used in Oracle Service Bus and Oracle SOA Suite to prevent and handle technical faults as well as business faults. Q&A This section lists answers to the questions that were raised during the preview event. Q: Where can retries be configured in Oracle Service Bus? The retry mechanism is used to prevent faults caused by temporary glitches such as short network interruptions. A faulted message is resend (retried) and might succeed this time since the glitch has passed. Retries are an out-of-the-box feature that can be used in Oracle Service Bus and Oracle SOA Suite using the Fault Policy framework. By default, retries are disabled in Oracle Service Bus. Read the full article. SOA & BPM Partner Community For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit  www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Mix Forum Technorati Tags: fault handling,vennester,SOA Community,Oracle SOA,Oracle BPM,Community,OPN,Jürgen Kress

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• OPTICS Clustering algorithm. How to get the best epsilon

  - by Marco Galassi

  I am implementing a project which needs to cluster geographical points. OPTICS algorithm seems to be a very nice solution. It needs just 2 parameters as input(MinPts and Epsilon), which are, respectively, the minimum number of points needed to consider them as a cluster, and the distance value used to compare if two points are in can be placed in same cluster. My problem is that, due to the extreme variety of the points, I can't set a fixed epsilon. Just look at the image below. The same points structure but in a different scale would result very different. Suppose to set MinPts=2 and epsilon = 1Km. On the left, the algorithm would create 2 clusters(red and blue), but on the right it would create one single cluster containing all of the points(red), but I would like to obtain 2 clusters even on the right. So my question is: is there any kind of way to calculate dynamically the epsilon value to get this result? Thank you very much and excuse my for my poor english. Marco

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• apache mod_jk loadbalancing issue for glassfish cluster instances

  - by SibzTer

  I have a JEE ear application deployed on 2 clusters with 2 instances each on Glassfish v3.1. These are load balanced by an Apache server running on the same machine. My problem is that I am frequently seeing the following error messages frequently in the mod_jk.log file. Can you help me understand what the issue is? [Mon Jun 13 09:37:51 2011] [7116:7852] [info] ajp_process_callback::jk_ajp_common.c (1885): Writing to client aborted or client network problems [Mon Jun 13 09:37:51 2011] [7116:7852] [info] ajp_service::jk_ajp_common.c (2543): (viewerLocalInstance4) sending request to tomcat failed (unrecoverable), because of client write error (attempt=1) [Mon Jun 13 09:37:51 2011] loadbalancerLocal myServer 0.062500 [Mon Jun 13 09:37:51 2011] [7116:6512] [info] ajp_process_callback::jk_ajp_common.c (1885): Writing to client aborted or client network problems [Mon Jun 13 09:37:51 2011] [7116:6512] [info] ajp_service::jk_ajp_common.c (2543): (viewerLocalInstance4) sending request to tomcat failed (unrecoverable), because of client write error (attempt=1) [Mon Jun 13 09:37:52 2011] [7116:3080] [info] ajp_process_callback::jk_ajp_common.c (1885): Writing to client aborted or client network problems [Mon Jun 13 09:37:52 2011] [7116:3080] [info] ajp_service::jk_ajp_common.c (2543): (viewerLocalInstance4) sending request to tomcat failed (unrecoverable), because of client write error (attempt=1) [Mon Jun 13 09:38:21 2011] [7116:6512] [info] service::jk_lb_worker.c (1388): service failed, worker viewerLocalInstance4 is in local error state [Mon Jun 13 09:38:21 2011] [7116:7852] [info] service::jk_lb_worker.c (1388): service failed, worker viewerLocalInstance4 is in local error state [Mon Jun 13 09:38:21 2011] [7116:6512] [info] service::jk_lb_worker.c (1407): unrecoverable error 200, request failed. Client failed in the middle of request, we can't recover to another instance. [Mon Jun 13 09:38:21 2011] [7116:7852] [info] service::jk_lb_worker.c (1407): unrecoverable error 200, request failed. Client failed in the middle of request, we can't recover to another instance. [Mon Jun 13 09:38:21 2011] loadbalancerLocal myServer 29.046875 [Mon Jun 13 09:38:21 2011] loadbalancerLocal myServer 29.171875 [Mon Jun 13 09:38:21 2011] [7116:6512] [info] jk_handler::mod_jk.c (2620): Aborting connection for worker=loadbalancerLocal [Mon Jun 13 09:38:21 2011] [7116:7852] [info] jk_handler::mod_jk.c (2620): Aborting connection for worker=loadbalancerLocal [Mon Jun 13 09:38:21 2011] [7116:7852] [info] ajp_process_callback::jk_ajp_common.c (1885): Writing to client aborted or client network problems [Mon Jun 13 09:38:21 2011] [7116:7852] [info] ajp_service::jk_ajp_common.c (2543): (viewerLocalInstance4) sending request to tomcat failed (unrecoverable), because of client write error (attempt=1) [Mon Jun 13 09:38:21 2011] loadbalancerLocal myServer 0.156250 [Mon Jun 13 09:38:21 2011] loadbalancerLocal myServer 0.062500 [Mon Jun 13 09:38:22 2011] [7116:3080] [info] service::jk_lb_worker.c (1388): service failed, worker viewerLocalInstance4 is in local error state [Mon Jun 13 09:38:22 2011] [7116:3080] [info] service::jk_lb_worker.c (1407): unrecoverable error 200, request failed. Client failed in the middle of request, we can't recover to another instance.

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• NoSQL Memcached API for MySQL: Latest Updates

  - by Mat Keep

  With data volumes exploding, it is vital to be able to ingest and query data at high speed. For this reason, MySQL has implemented NoSQL interfaces directly to the InnoDB and MySQL Cluster (NDB) storage engines, which bypass the SQL layer completely. Without SQL parsing and optimization, Key-Value data can be written directly to MySQL tables up to 9x faster, while maintaining ACID guarantees. In addition, users can continue to run complex queries with SQL across the same data set, providing real-time analytics to the business or anonymizing sensitive data before loading to big data platforms such as Hadoop, while still maintaining all of the advantages of their existing relational database infrastructure. This and more is discussed in the latest Guide to MySQL and NoSQL where you can learn more about using the APIs to scale new generations of web, cloud, mobile and social applications on the world's most widely deployed open source database The native Memcached API is part of the MySQL 5.6 Release Candidate, and is already available in the GA release of MySQL Cluster. By using the ubiquitous Memcached API for writing and reading data, developers can preserve their investments in Memcached infrastructure by re-using existing Memcached clients, while also eliminating the need for application changes. Speed, when combined with flexibility, is essential in the world of growing data volumes and variability. Complementing NoSQL access, support for on-line DDL (Data Definition Language) operations in MySQL 5.6 and MySQL Cluster enables DevOps teams to dynamically update their database schema to accommodate rapidly changing requirements, such as the need to capture additional data generated by their applications. These changes can be made without database downtime. Using the Memcached interface, developers do not need to define a schema at all when using MySQL Cluster. Lets look a little more closely at the Memcached implementations for both InnoDB and MySQL Cluster. Memcached Implementation for InnoDB The Memcached API for InnoDB is previewed as part of the MySQL 5.6 Release Candidate. As illustrated in the following figure, Memcached for InnoDB is implemented via a Memcached daemon plug-in to the mysqld process, with the Memcached protocol mapped to the native InnoDB API. Figure 1: Memcached API Implementation for InnoDB With the Memcached daemon running in the same process space, users get very low latency access to their data while also leveraging the scalability enhancements delivered with InnoDB and a simple deployment and management model. Multiple web / application servers can remotely access the Memcached / InnoDB server to get direct access to a shared data set. With simultaneous SQL access, users can maintain all the advanced functionality offered by InnoDB including support for Foreign Keys, XA transactions and complex JOIN operations. Benchmarks demonstrate that the NoSQL Memcached API for InnoDB delivers up to 9x higher performance than the SQL interface when inserting new key/value pairs, with a single low-end commodity server supporting nearly 70,000 Transactions per Second. Figure 2: Over 9x Faster INSERT Operations The delivered performance demonstrates MySQL with the native Memcached NoSQL interface is well suited for high-speed inserts with the added assurance of transactional guarantees. You can check out the latest Memcached / InnoDB developments and benchmarks here You can learn how to configure the Memcached API for InnoDB here Memcached Implementation for MySQL Cluster Memcached API support for MySQL Cluster was introduced with General Availability (GA) of the 7.2 release, and joins an extensive range of NoSQL interfaces that are already available for MySQL Cluster Like Memcached, MySQL Cluster provides a distributed hash table with in-memory performance. MySQL Cluster extends Memcached functionality by adding support for write-intensive workloads, a full relational model with ACID compliance (including persistence), rich query support, auto-sharding and 99.999% availability, with extensive management and monitoring capabilities. All writes are committed directly to MySQL Cluster, eliminating cache invalidation and the overhead of data consistency checking to ensure complete synchronization between the database and cache. Figure 3: Memcached API Implementation with MySQL Cluster Implementation is simple: 1. The application sends reads and writes to the Memcached process (using the standard Memcached API). 2. This invokes the Memcached Driver for NDB (which is part of the same process) 3. The NDB API is called, providing for very quick access to the data held in MySQL Cluster’s data nodes. The solution has been designed to be very flexible, allowing the application architect to find a configuration that best fits their needs. It is possible to co-locate the Memcached API in either the data nodes or application nodes, or alternatively within a dedicated Memcached layer. The benefit of this flexible approach to deployment is that users can configure behavior on a per-key-prefix basis (through tables in MySQL Cluster) and the application doesn’t have to care – it just uses the Memcached API and relies on the software to store data in the right place(s) and to keep everything synchronized. Using Memcached for Schema-less Data By default, every Key / Value is written to the same table with each Key / Value pair stored in a single row – thus allowing schema-less data storage. Alternatively, the developer can define a key-prefix so that each value is linked to a pre-defined column in a specific table. Of course if the application needs to access the same data through SQL then developers can map key prefixes to existing table columns, enabling Memcached access to schema-structured data already stored in MySQL Cluster. Conclusion Download the Guide to MySQL and NoSQL to learn more about NoSQL APIs and how you can use them to scale new generations of web, cloud, mobile and social applications on the world's most widely deployed open source database See how to build a social app with MySQL Cluster and the Memcached API from our on-demand webinar or take a look at the docs Don't hesitate to use the comments section below for any questions you may have 

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• IIS7 failover cluster across datacenters

  - by Scott

  Hello, I have servers in two different datacenters with each datacenter getting static IPs. What I would like to do is setup the servers as IIS7 servers and allowing them to failover from datacenter to datacenter with little (or preferably) no interruption. Servers on both sides are running Windows Server 2008 x64 with IIS7 (or 7.5 if needed). I am interested in how to point DNS traffic to the new datacenter without manual human intervention. For example: Datacenter A: IP: 192.168.1.115 Servers: Server 2008 x64 w/ IIS 7 Datacenter B: IP: 192.168.1.220 Servers: Server 2008 x64 w/ IIS 7 Other information: Domain Name: Example.org Domain DNS: 192.168.1.115 If Datacenter A connectivity went down (broken service line, etc.) how does the traffic know to route to Datacenter B on 192.168.1.220? Thanks, Scott

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• Can't add service account to domain group during SQL cluster install

  - by Sam

  I'm installing a 2008 instance on a Server 2003 machine which is already running SQL 2005. I need to set up domain groups for the security setup step: http://msdn.microsoft.com/en-us/library/ms179530.aspx On Windows Server 2003, specify domain groups for SQL Server services. All resource permissions are controlled by domain-level groups that include SQL Server service accounts as group members. Much more info on this here: http://support.microsoft.com/kb/910708 I've had problems with being able to add the windows service accounts to the groups at install time. The security admins had to make my account a domain admin - which they were hesitant to do. The account under which SQL Server Setup is running must have permissions to add accounts to the domain groups. Is there a specific security setting which would allow my account to add accounts to a group? UPDATE: I'm looking for specific instructions. I have a global group called domain\servicegroup - what do I tell the security folks to do. I'd love to figure it out myself, but I don't have access to this stuff.

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• CentOS Failover Cluster - SIOCADDRT: No such process (when adding a loopback)

  - by Steve Rolfe

  I'm trying to configure two web servers for a load balancing server. The load balancing aspect works fine (it sees both server, kills 'em if it needs to, and seems to direct traffic fine). The only issue is with the servers looping: /etc/sysconfig/network-scripts/ifcfg-lo:0 DEVICE=lo:0 IPADDR=<Virtual IP> NETMASK=255.255.255.255 ONBOOT=yes NAME=loopback Everytime I try a "service network restart" I get a SIOCADDRT: No such process when loading the loopback interface. Anyone have an idea what's causing this?

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• Webmin Cluster Copy Protocol

  - by hozza

  Just toying with a clustered server farm for fun (as you do) and experimenting with Webmin and its 'clustered' modules. It has a feature that can copy files from one server to another on a repeating basis. Does this feature/module use cron jobs and what protocol does it use to copy the files? I have searched all about the net and yet I cannot find any decent documentation on webmin or its features. Is it just poorly documented or am I missing something?

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• Weblogic - Dynamic Clustering in practice by Andy Overton

  - by JuergenKress

  The latest version of Weblogic (12.1.2) includes support for Dynamic Clustering. For more details on what else is new in 12.1.2 see my previous blog post. In this blog post I will look at setting up a dynamic cluster on 2 machines with 4 managed servers (2 on each). I will then deploy an application to the cluster and show how to expand the cluster. What is a dynamic cluster? A dynamic cluster is any cluster that contains one or more dynamic servers. Each server in the cluster will be based upon a single shared server template. The server template allows you to configure each server the same and ensures that servers do not need to be manually configured before being added to the cluster. This allows you to easily scale up or down the number of servers in your cluster without the need for setting up each server manually. Changes made to the server template are rolled out to all servers that use that template. Read the complete article here. WebLogic Partner Community For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Mix Forum Wiki Technorati Tags: WebLogic 12c cluster,WebLogic,WebLogic Community,Oracle,OPN,Jürgen Kress,Andy Overton

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• No cpufreq sub-directory in one of the nodes in our cluster

  - by Sharat Chandra

  How do you change the governor from Ondemand to something else ?

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• One of the nodes of a 4 node cluster is not allowing me to access GFS

  - by Nishant

  [root@host3 ~]# cd /var/opt/new/new1/global -bash: cd: /var/opt/new/new1/global: Input/output error output of the df : /dev/mapper/vgglobal-lvol3 11524928 2560092 8964836 23% /var/opt/new/new1/global One of the nodes , doesn't allow me to CD to this GFS file system !!! I cant understand whats happening . The bash itself is telling me i/o error !

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• Cannont add service account to domain group during sql cluster install

  - by Sam

  I'm installing a 2008 instance on a 2003 machine which is already running 2005. I need to set up domain groups for the security setup step: http://msdn.microsoft.com/en-us/library/ms179530.aspx On Windows Server 2003, specify domain groups for SQL Server services. All resource permissions are controlled by domain-level groups that include SQL Server service accounts as group members. Much more info on this here: http://support.microsoft.com/kb/910708 I've had problems with being able to add the windows service accounts to the groups at install time. The security admins had to make my account a domain admin - which they were hesitant to do. The account under which SQL Server Setup is running must have permissions to add accounts to the domain groups. Is there a specific security setting which would allow my account to add accounts to a group?

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• How to automatically start the perfmon on SQL Server cluster active node

  - by Jlamber

  How can we start running perfmon automatically on active SQL Server active node? Typically when we failover to the inactive node and we forgot to run the perfmon. We want to start running the perfmom automatically if possible. If not how can we tell if perfmon is not running so we can send out alert to start the perfmom? We can watch the log file output but we want to know if there is more elegance solution. Thank you.

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• cluster of services and restarting on package upgrade

  - by Marcin Cylke

  I'm using puppet to manage a bunch of servers. Those servers run a simple service - exposed to the world via load balancer. That service's instances are independent in that they can run on their own, are are deployed on multiple servers to increase responsiveness. Now, when I push a new package to repo and puppet catches up with it appearing there it just updates this package on all services. This results in a short downtime of entire service. Is there a way of configuring puppet to do restart the services sequentially? Or using any other kind of strategy?

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• Measuring performance indicators on a cluster

  - by Aditya Singh

  My architecture is based on Amazon. A ELB load balancer balances POST requests among m1.large instances. Every instance has a nginx server on port 80 which distributes the requests to 4 python-tornado servers on backend which handle the request. These tornado servers are taking about 5 - 10ms to respond to one request but this is the internal compute time of every request. I want to put this thing on test and i want to measure the response time from ELB to upstream and back and how does it vary when the QPS throughput is increased and plot a graph of Time vs. QPS vs. Latency and other factors like CPU and Memory. Is there a software to do that or should i log everything somewhere with latency checks and then analyze the whole log to get the stuff out. I would also need to write a self-monitor which keeps checking the whole response time. Is it possible to do it with a script from within the server. If so, will it be accurate ?

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• MySQL Cluster transaction isolation level - READ_COMMITTED

  - by Doori Bar

  I'm learning by mostly reading the documentation. Unfortunately, http://dev.mysql.com/doc/refman/5.1/en/set-transaction.html#isolevel_read-committed doesn't say anything, while it says everything. Confused? Me too. ndb engine supports only "READ_COMMITTED" transaction isolation level. A. It starts by saying "sets and reads its own fresh snapshot", which I translate to: The transaction is having a separated 'zone' which whatever it stores there - is what it reads back. B. While out-side of the transaction, the old-values are unlocked. C. It continues with: "for locking reads" sentence - No idea what it means. Question: they claim only READ_COMMITTED transaction isolation level is supported, but while handling a BLOB or a TEXT, they say the isolation is now "locked for reading" too. So is it a contradiction? can a transaction LOCK for reading just as well while handling something other than BLOB/TEXT? (such as integers)

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• Dynamically changing one-node Cassandra cluster to two nodes

  - by Jason Axelson

  So I have an application that will be very dormant most of the time but will need high-bursting a few days out of the month. Since we are deploying on EC2 I would like to keep only one Cassandra server up most of the time and then on burst days I want to bring one more server up (with more RAM and CPU than the first) to help serve the load. What is the best way to do this? Should I take a different approach? Some notes about what I plan to do: Bring the node up and repair it immediately After the burst time is over decommission the powerful node Use the always-on server as the seed node My main question is how to get the nodes to share all the data since I want a replication factor of 2 (so both nodes have all the data) but that won't work while there is only one server. Should I bring up 2 extra servers instead of just one?

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• Unable to run MR on cluster

  - by RAVITEJA SATYAVADA

  I have an Map reduce program that is running successfully in standalone(Ecllipse) mode but while trying to run the same MR by exporting the jar in cluster. It is showing null pointer exception like this, 13/06/26 05:46:22 ERROR mypackage.HHDriver: Error while configuring run method. java.lang.NullPointerException I double checked the run method parameters those are not null and it is running in standalone mode as well..

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• Does HttpRuntime.Cache work in Load Cluster enviornment?

  - by hotyi

  Hi, Does anyone have knowledge if the HttpRuntime.Cache works in load cluster enviornment? and how to implement them?

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• Scipy-Cluster installation for python 2.6

  - by Hossein

  Hi, Has anyone used scipy-cluster for python? I am trying to compile its source code with python 2.6 but I get some irrelevant errors. has someone had the same problem?

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• Physically cluster a MYSQL table for better performance

  - by ming yeow

  I have a 30M row table, which is indexed by ID now. However, a lot of the requests are around a much smaller subset, which is identified by app_user=1 Does it make sense to physically cluster the table according to this? If so, how can I do so?

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