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• Accessing previous activity instances in a sequence activity

  - by Dan Revell

  This has a rather SharePoint spin to it but the problem is straight workflow. I've got a parallel replication activity which contains a sequence activity. The sequence activity contains a CreateTask activity, a CodeActivity, a OnTaskChanged activity and finally a CompleteTask activity. The idea is to create a task for each username passed into the ReplicatorActivity.InitialChildData property. Typically in workflow I bind a field to the CreateTask.TaskId and CreateTask.TaskProperties and inside the CreateTask.MethodInvoking I set these through the local bound fields. This works and my tasks all get created properly. However in the CodeActivity that follows, I want to then access the TaskProperties. The problem I am encountering is that this field holds the values of the final task to be created as the CreateTask runs for all the replications before the CodeActivity gets to runs. From the CodeActivity, here are two ways I've tried to access the CreateTask activity instance from the same context or instance or whatever the terminology is for the replicated sequence. CreateTask task = ((CreateTask)sender.Parent.GetActivityByName("createSoftwareRequestTask", true)); CreateTask createTask = (CreateTask)sender.Parent.Activities[0]; Unfortunately the CreateTask activities both refer back to the last task to be created and not the task from the context that the CodeActivity is executing within. Two reasons why this might be that I can think of. I'm not accessing the correct instance with my code. I am accessing the correct instance, but as the properties I require were bound to and set through local fields then their previous data was overwritten. I'm hitting a brick wall with my understanding of workflow with this and would very much appreciate some assistance here.

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• Cassandra hot keyspace structure change

  - by Pierre

  Hello. I'm currently running a 12-node Cassandra cluster storing 4TB of data, with a replication factor set to 3. For the needs of an application update, we need to change the configuration of our keyspace, and we'd like to avoid any downtime if possible. I read on a mailing list that the best way to do it is to: Kill cassandra process on one server of the cluster Start it again, wait for the commit log to be written on the disk, and kill it again Make the modifications in the storage.xml file Rename or delete the files in the data directories according to the changes we made Start cassandra Goto 1 with next server on the list My questions would be: Did I understand the process well? Is there any risk of data corruption? During the process, there will be servers with different versions of the storage.xml file in the same cluser, same keyspace. Is it a problem? Same question as above if we not only add, rename and remove ColumnFamilies, but if we change the CompareWith parameter / transform an existing column family into a super one. Or do we need to change the name? Thank you for your answers. It's the first time I'll do this, and I'm a little bit scared.

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• Commercial Website architecture question

  - by Maxime ARNSTAMM

  Hello everyone, I have to write an architecture case study but there are some things that i don't know, so i'd like some pointers on the following : The website must handle 5k simultaneous users. The backend is composed by a commercial software, some webservices, some message queues, and a database. I want to recommend to use Spring for the backend, to deal with the different elements, and to expose some Rest services. I also want to recommend wicket for the front (not the point here). What i don't know is : must i install the front and the back on the same tomcat server or two different ? and i am tempted to put two servers for the front, with a load balancer (no need for session replication in this case). But if i have two front servers, must i have two back servers ? i don't want to create some kind of bottleneck. Based on what i read on this blog a really huge charge is handle by one tomcat only for the first website mentionned. But i cannot find any info on this, so i can't tell if it seems plausible. If you can enlight me, so i can go on in my case study, that would be really helpful. Thanks :)

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• Help using RDA on a Desktop Applicaton?

  - by Joel

  I have a .NET 3.5 Compact Framework project that uses RDA for moving data between its mobile device's local SqlCe database and a remote MSSql-2008 server(it uses RDA Push and Pull). The server machine a virtual directory with sqlcesa35.dll (v3.5.5386.0) setup for RDA. We usually install these cabs on the mobile devices and the RDA process does not have any problems: sqlce.wce5.armv4i.cab sqlce.repl.wce5.armv4i.cab Now I am trying to run this application as a desktop application. RDA Pull (download) has been working well. But the RDA Push (upload) is giving me some problems. This is the exception that I get on the desktop application when I try to use RDA Push: System.Data.SqlServerCe.SqlCeException The Client Agent and Server Agent component versions are incompatible. The compatible versions are: Client Agent versions 3.0 and 3.5 with Server Agent versions 3.5 and Client Agent version 3.5 with Server Agent version 3.5. Re-install the replication components with the matching versions for client and server agents. [ 35,30,Client Agent version = ,Server Agent version = ] I have tried copying the file C:\Program Files\Microsoft SQL Server Compact Edition\v3.5\Desktop\SqlServerCe.dll (v3.5.5692.0) to bin\debug I have also tried copying another version of SqlServerCe.dll (v3.0.5206.0) to bin\debug. But this just gives me a slightly different exception: System.Data.SqlServerCe.SqlCeException [ 35,30 ] Is there a different setup or any different dlls that I need to use? Thanks, -Joel

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• Hadoop reduce task gets hung

  - by user806098

  I set up a hadoop cluster with 4 nodes, When running a map-reduce task, the map task finishes quickly, while the reduce task hangs at 27% percent. I checked the log, it's that the reduce task fails to fetch map output from map nodes. The job tracker log of master shows messages like this: 2011-06-27 19:55:14,748 INFO org.apache.hadoop.mapred.JobTracker: Adding task (REDUCE) 'attempt_201106271953_0001_r_000000_0' to tip task_201106271953_0001_r_000000, for tracker 'tracker_web30.bbn.com.cn:localhost/127.0.0.1:56476' And the name node log of master shows messages like this: 2011-06-27 14:00:52,898 INFO org.apache.hadoop.ipc.Server: IPC Server handler 4 on 54310, call register(DatanodeRegistration(202.106.199.39:50010, storageID=DS-1989397900-202.106.199.39-50010-1308723051262, infoPort=50075, ipcPort=50020)) from 192.168.225.19:16129: error: java.io.IOException: verifyNodeRegistration: unknown datanode 202.106.199.3 9:50010 However, neither the "web30.bbn.com.cn" or 202.106.199.39, 202.106.199.3 is the slave node. I think such ip/domains appear because hadoop fails to resolve a node(first in the Intranet DNS server), then it goes to a higher-level DNS server, later to the top, still fails, then the "junk" ip/domains are returned. But I checked my config, it goes like this: /etc/hosts: 127.0.0.1 localhost.localdomain localhost ::1 localhost6.localdomain6 localhost6 192.168.225.16 master 192.168.225.66 slave1 192.168.225.20 slave5 192.168.225.17 slave17 conf/core-site.xml: hadoop.tmp.dir /root/hadoop_tmp/hadoop_${user.name} fs.default.name hdfs://master:54310 io.sort.mb 1024 hdfs-site.xml: dfs.replication 3 masters: master slaves: master slave1 slave5 slave17 Also, all firewalls(iptables) are turned off, and ssh between each 2 nodes is ok. so I don't know where exact the error comes from. Please help. Thanks a lot.

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• Combining cache methods - memcache/disk based

  - by Industrial

  Hi! Here's the deal. We would have taken the complete static html road to solve performance issues, but since the site will be partially dynamic, this won't work out for us. What we have thought of instead is using memcache + eAccelerator to speed up PHP and take care of caching for the most used data. Here's our two approaches that we have thought of right now: Using memcache on all<< major queries and leaving it alone to do what it does best. Usinc memcache for most commonly retrieved data, and combining with a standard harddrive-stored cache for further usage. The major advantage of only using memcache is of course the performance, but as users increases, the memory usage gets heavy. Combining the two sounds like a more natural approach to us, even though the theoretical compromize in performance. Memcached appears to have some replication features available as well, which may come handy when it's time to increase the nodes. What approach should we use? - Is it stupid to compromize and combine the two methods? Should we insted be focusing on utilizing memcache and instead focusing on upgrading the memory as the load increases with the number of users? Thanks a lot!

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• Using memory-based cache together with conventional cache

  - by Industrial

  Hi! Here's the deal. We would have taken the complete static html road to solve performance issues, but since the site will be partially dynamic, this won't work out for us. What we have thought of instead is using memcache + eAccelerator to speed up PHP and take care of caching for the most used data. Here's our two approaches that we have thought of right now: Using memcache on all<< major queries and leaving it alone to do what it does best. Usinc memcache for most commonly retrieved data, and combining with a standard harddrive-stored cache for further usage. The major advantage of only using memcache is of course the performance, but as users increases, the memory usage gets heavy. Combining the two sounds like a more natural approach to us, even though the theoretical compromize in performance. Memcached appears to have some replication features available as well, which may come handy when it's time to increase the nodes. What approach should we use? - Is it stupid to compromize and combine the two methods? Should we insted be focusing on utilizing memcache and instead focusing on upgrading the memory as the load increases with the number of users? Thanks a lot!

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• How can I automatically generate sql update scripts when some data is updated ?

  - by Brann

  I'd like to automatically generate an update script each time a value is modified in my database. In other words, if a stored procedure, or a query, or whatever updates column a with value b in table c (which as a pk column (i,j...k), I want to generate this : update c set a=b where i=... and j=... and k=... and store it somewhere (for example as a raw string in a table). To complicate things, I want the script to be generated only if the update has been made by a specific user. Good news is that I've got a primary key defined for all my tables. I can see how to do this using a trigger, but I would need to generate specific triggers for each table, and to update them each and every-time my schema changes. I guess there are some built-in ways to do this as SQL server sometimes need to store this kind of things (while using transactional replication for example), but couldn't find anything so far ... any ideas ? I'm also interested in ways to automatically generate triggers (probably using triggers - meta triggers, huh? - since I will need to update triggers automatically when the schema change)

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• Using memcache together with conventional cache

  - by Industrial

  Hi! Here's the deal. We would have taken the complete static html road to solve performance issues, but since the site will be partially dynamic, this won't work out for us. What we have thought of instead is using memcache + eAccelerator to speed up PHP and take care of caching for the most used data. Here's our two approaches that we have thought of right now: Using memcache on all<< major queries and leaving it alone to do what it does best. Usinc memcache for most commonly retrieved data, and combining with a standard harddrive-stored cache for further usage. The major advantage of only using memcache is of course the performance, but as users increases, the memory usage gets heavy. Combining the two sounds like a more natural approach to us, even though the theoretical compromize in performance. Memcached appears to have some replication features available as well, which may come handy when it's time to increase the nodes. What approach should we use? - Is it stupid to compromize and combine the two methods? Should we insted be focusing on utilizing memcache and instead focusing on upgrading the memory as the load increases with the number of users? Thanks a lot!

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• Consolidate multiple site files into single location

  - by seengee

  We have a custom PHP/MySQL CMS running on Linux/Apache thats rolled out to multiple sites (20+) on the same server. Each site uses exactly the same CMS files with a few files for each site being customised. The customised files for each site are: /library/mysql_connect.php /public_html/css/* /public_html/ftparea/* /public_html/images/* There's also a couple of other random files inside /public_html/includes/ that are unique to each site. Other than this each site on the server uses the exact same files. Each site sitting within /home/username/. There is obviously a massive amount of replication here as each time we want to deploy a system update we need to update to each user account. Given the common site files are all stored in SVN it would make far more sense if we were able to simply commit to SVN and deploy to a single location direct from there. Unfortunately, making a major architecture change at this stage could be problematic. In my mind the ideal scenario would mean creating an account like /home/commonfiles/ and each site using these common files unless an account specific file exists, for example a request is made to /home/user/public_html/index.php but as this file doesnt exist the request is then redirected to /home/commonfiles/public_html/index.php. I know that generally this approach is possible, similar to how Zend Framework (and probably others) redirect all requests that dont match a specific file to index.php. I'm just not sure about how exactly to go about implementing it and whether its actually advisable. Would really welcome any input/ideas people have got. Thanks.

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• jboss cache as hibernate 2nd level - cluster node doesn't persist replicated data

  - by Sergey Grashchenko

  I'm trying to build an architecture basically described in user guide http://www.jboss.org/file-access/default/members/jbosscache/freezone/docs/3.2.1.GA/userguide_en/html/cache_loaders.html#d0e3090 (Replicated caches with each cache having its own store.) but having jboss cache configured as hibernate second level cache. I've read manual for several days and played with the settings but could not achieve the result - the data in memory (jboss cache) gets replicated across the hosts, but it's not persisted in the datasource/database of the target (not original) cluster host. I had a hope that a node might become persistent at eviction, so I've got a cache listener and attached it to @NoveEvicted event. I found that though I could adjust eviction policy to fully control it, no any persistence takes place. Then I had a though that I could try to modify CacheLoader to set "passivate" to true, but I found that in my case (hibernate 2nd level cache) I don't have a way to access a loader. I wonder if replicated data persistence is possible at all by configuration tuning ? If not, will it work for me to create some manual peristence in CacheListener (I could check whether the eviction event is local, and if not - persist it to hibernate datasource somehow) ? I've used mvcc-entity configuration with the modification of cacheMode - set to REPL_ASYNC. I've also played with the eviction policy configuration. Last thing to mention is that I've tested entty persistence and replication in project that has been generated with Seam. I guess it's not important though.

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• Oracle - UPSERT with update not executed for unmodified values

  - by Buthrakaur

  I'm using following update or insert Oracle statement at the moment: BEGIN UPDATE DSMS SET SURNAME = :SURNAME, FIRSTNAME = :FIRSTNAME, VALID = :VALID WHERE DSM = :DSM; IF (SQL%ROWCOUNT = 0) THEN INSERT INTO DSMS (DSM, SURNAME, FIRSTNAME, VALID) VALUES (:DSM, :SURNAME, :FIRSTNAME, :VALID); END IF; END; This runs fine except that the update statement performs dummy update if the data is same as the parameter values provided. I would not mind the dummy update in normal situation, but there's a replication/synchronization system build over this table using triggers on tables to capture updated records and executing this statement frequently for many records simply means that I'd cause huge traffic in triggers and the sync system. Is there any simple method how to reformulate this code that the update statement wouldn't update record if not necessary without using following IF-EXISTS check code which I find not sleek enough and maybe also not most efficient for this task? DECLARE CNT NUMBER; BEGIN SELECT COUNT(1) INTO CNT FROM DSMS WHERE DSM = :DSM; IF SQL%FOUND THEN UPDATE DSMS SET SURNAME = :SURNAME, FIRSTNAME = :FIRSTNAME, VALID = :VALID WHERE DSM = :DSM AND (SURNAME != :SURNAME OR FIRSTNAME != :FIRSTNAME OR VALID != :VALID); ELSE INSERT INTO DSMS (DSM, SURNAME, FIRSTNAME, VALID) VALUES (:DSM, :SURNAME, :FIRSTNAME, :VALID); END IF; END;

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• Is it better to use a relational database or document-based database for an app like Wufoo?

  - by mboyle

  I'm working on an application that's similar to Wufoo in that it allows our users to create their own databases and collect/present records with auto generated forms and views. Since every user is creating a different schema (one user might have a database of their baseball card collection, another might have a database of their recipes) our current approach is using MySQL to create separate databases for every user with its own tables. So in other words, the databases our MySQL server contains look like: main-web-app-db (our web app containing tables for users account info, billing, etc) user_1_db (baseball_cards_table) user_2_db (recipes_table) .... And so on. If a user wants to set up a new database to keep track of their DVD collection, we'd do a "create database ..." with "create table ...". If they enter some data in and then decide they want to change a column we'd do an "alter table ....". Now, the further along I get with building this out the more it seems like MySQL is poorly suited to handling this. 1) My first concern is that switching databases every request, first to our main app's database for authentication etc, and then to the user's personal database, is going to be inefficient. 2) The second concern I have is that there's going to be a limit to the number of databases a single MySQL server can host. Pretending for a moment this application had 500,000 user databases, is MySQL designed to operate this way? What if it were a million, or more? 3) Lastly, is this method going to be a nightmare to support and scale? I've never heard of MySQL being used in this way so I do worry about how this affects things like replication and other methods of scaling. To me, it seems like MySQL wasn't built to be used in this way but what do I know. I've been looking at document-based databases like MongoDB, CouchDB, and Redis as alternatives because it seems like a schema-less approach to this particular problem makes a lot of sense. Can anyone offer some advice on this?

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• How to format the node_redis info function output?

  - by hh54188

  I want check the Redis info on my pc with node, so I use node_redis and run the info function: var redis = require("redis"), client = redis.createClient(); client.on("connect", function () { client.info(function (err, replay) { console.log(replay); }) }) but the response is un-format: `#Server\r\nredis_version:2.6.16\r\nredis_git_sha1:00000000\r\nredis_git_dirty:0\r\nredis_mode:standalone\r\nos:Linux 3.8.0-29-generic x86_64\r\narch_bits:64\r\nmultiplexing_api:epoll\r\ngcc_version:4.6.3\r\nprocess_id:2941\r\nrun_id:e60f261a6f4f6f081563a47961315eff6b1c005d\r\ntcp_port:6379\r\nuptime_in_seconds:1777\r\nuptime_in_days:0\r\nhz:10\r\nlru_clock:2040689\r\n\r\n# Clients\r\nconnected_clients:2\r\nclient_longest_output_list:0\r\nclient_biggest_input_buf:0\r\nblocked_clients:0\r\n\r\n# Memory\r\nused_memory:562584\r\nused_memory_human:549.40K\r\nused_memory_rss:2031616\r\nused_memory_peak:561784\r\nused_memory_peak_human:548.62K\r\nused_memory_lua:31744\r\nmem_fragmentation_ratio:3.61\r\nmem_allocator:jemalloc-3.2.0\r\n\r\n# Persistence\r\nloading:0\r\nrdb_changes_since_last_save:0\r\nrdb_bgsave_in_progress:0\r\nrdb_last_save_time:1383553917\r\nrdb_last_bgsave_status:ok\r\nrdb_last_bgsave_time_sec:-1\r\nrdb_current_bgsave_time_sec:-1\r\naof_enabled:0\r\naof_rewrite_in_progress:0\r\naof_rewrite_scheduled:0\r\naof_last_rewrite_time_sec:-1\r\naof_current_rewrite_time_sec:-1\r\naof_last_bgrewrite_status:ok\r\n\r\n# Stats\r\ntotal_connections_received:3\r\ntotal_commands_processed:5\r\ninstantaneous_ops_per_sec:0\r\nrejected_connections:0\r\nexpired_keys:0\r\nevicted_keys:0\r\nkeyspace_hits:0\r\nkeyspace_misses:0\r\npubsub_channels:0\r\npubsub_patterns:0\r\nlatest_fork_usec:0\r\n\r\n# Replication\r\nrole:master\r\nconnected_slaves:0\r\n\r\n# CPU\r\nused_cpu_sys:0.13\r\nused_cpu_user:0.19\r\nused_cpu_sys_children:0.00\r\nused_cpu_user_children:0.00\r\n\r\n# Keyspace\r\n' How can I turn it to an object? like: { redis_version:2.6.16, redis_git_sha1:00000000, redis_git_dirty:0, ...... } so that I can read each property's value, get information I need

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• Structure map and generics (in XML config)

  - by James D

  Hi I'm using the latest StructureMap (2.5.4.264), and I need to define some instances in the xml configuration for StructureMap using generics. However I get the following 103 error: Unhandled Exception: StructureMap.Exceptions.StructureMapConfigurationException: StructureMap configuration failures: Error: 103 Source: Requested PluginType MyTest.ITest`1[[MyTest.Test,MyTest]] configured in Xml cannot be found Could not create a Type for 'MyTest.ITest`1[[MyTest.Test,MyTest]]' System.ApplicationException: Could not create a Type for 'MyTest.ITest`1[[MyTest.Test,MyTest]]' ---> System.TypeLoadException: Could not loa d type 'MyTest.ITest`1' from assembly 'StructureMap, Version=2.5.4.264, Culture=neutral, PublicKeyToken=e60ad81abae3c223'. at System.RuntimeTypeHandle._GetTypeByName(String name, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark& stackMark, Boolean loadTypeFromPartialName) at System.RuntimeTypeHandle.GetTypeByName(String name, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark& stackMark) at System.RuntimeType.PrivateGetType(String typeName, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark& s tackMark) at System.Type.GetType(String typeName, Boolean throwOnError) at StructureMap.Graph.TypePath.FindType() --- End of inner exception stack trace --- at StructureMap.Graph.TypePath.FindType() at StructureMap.Configuration.GraphBuilder.ConfigureFamily(TypePath pluginTypePath, Action`1 action) A simply replication of the code is as follows: public interface ITest<T> { } public class Test { } public class Concrete : ITest<Test> { } Which I then wish to define in the XML configuration something as follows: <DefaultInstance PluginType="MyTest.ITest`1[[MyTest.Test,MyTest]],MyTest" PluggedType="MyTest.Concrete,MyTest" Scope="Singleton" /> I've been racking my brain, however I can't see what I'm doing wrong - I've used Type.GetType to verify the type actually is valid which it is. Anyone have any ideas? Thanks !

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• what's the performance difference between int and varchar for primary keys

  - by user568576

  I need to create a primary key scheme for a system that will need peer to peer replication. So I'm planning to combine a unique system ID and a sequential number in some way to come up with unique ID's. I want to make sure I'll never run out of ID's, so I'm thinking about using a varchar field, since I could always add another character if I start running out. But I've read that integers are better optimized for this. So I have some questions... 1) Are integers really better optimized? And if they are, how much of a performance difference is there between varchars and integers? I'm going to use firebird for now. But I may switch later. Or possibly support multiple db's. So I'm looking for generalizations, if that's possible. 2) If integers are significantly better optimized, why is that? And is it likely that varchars will catch up in the future, so eventually it won't matter anyway? My varchar keys won't have any meaning, except for the unique system ID part. But I may want to obscure that somehow. Also, I plan to efficiently use all the bits of each character. I don't, for example, plan to code the integer 123 as the character string "123". So I don't think varchars will require more space than integers.

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• How to run stored procedures and ad-hoc scripts asynchronously with "loosely" connected SQL Server 2

  - by sanga

  Is there a way to initiate a script against an instance of SQL server when it is not connected then have it run on the instance the next time it connects? This needs to happen without any intervention from me. Background situation if you are interested: We have about 120 machines each with their own instance of SQL Server 2000. Most of them are laptops. We have merge replication set up with each one. From time to time, there is a need to delete "rogue" guids from some tables in some instances that overwrite legitimate records on the main publisher as well as perform administrative tasks via stored procedure or adhoc sql statements. The problem is there is no telling when each machine is going to be connected to the network. Some folks turn their machines completely off at the end of the day. Others disconnect their machines and take them on business trips, home for the weekend etc. Did I mention that about 35 of these machines are in utility trucks and "attempt" to sync over a wireless connection. Thanks in advance for any assistance or suggestions. Sanga

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• How to increase my "advanced" knowledge of PHP further? (quickly)

  - by Kerry

  I have been working with PHP for years and gotten a very good grasp of the language, created many advanced and not-so-advanced systems that are working very well. The problem I'm running into is that I only learn when I find a need for something that I haven't learned before. This causes me to look up solutions and other code that handles the problem, and so I will learn about a new function or structure that I hadn't seen before. It is in this way that I have learned many of my better techniques (such as studying classes put out by Amazon, Google or other major companies). The main problem with this is the concept of not being able to learn something if you don't know it exists. For instance, it took me several months of programming to learn about the empty() function, and I simply would check the string length using strlen() to check for empty values. I'm now getting into building bigger and bigger systems, and I've started to read blogs like highscalability.com and been researching MySQL replication and server data for scaling. I know that structure of your code is very important to make full systems work. After reading a recent blog about reddit's structure, it made me question if there is some standard or "accepted systems" out there. I have looked into frameworks (I've used Kohana, which I regretted, but decided that PHP frameworks were not for me) and I prefer my own library of functions rather than having a framework. My current structure is a mix between WordPress, Kohana and my own knowledge. The ways I can see as being potentially beneficial are: Read blogs Read tutorials Work with someone else Read a book What would be the best way(s) to "get to the next level" the level of being a very good system developer?

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• subset complete or balance dataset in r

  - by SHRram

  I have a dataset that unequal number of repetition. I want to subset a data by removing those entries that are incomplete (i.e. replication less than maximum). Just small example: set.seed(123) mydt <- data.frame (name= rep ( c("A", "B", "C", "D", "E"), c(1,2,4,4, 3)), var1 = rnorm (14, 3,1), var2 = rnorm (14, 4,1)) mydt name var1 var2 1 A 2.439524 3.444159 2 B 2.769823 5.786913 3 B 4.558708 4.497850 4 C 3.070508 2.033383 5 C 3.129288 4.701356 6 C 4.715065 3.527209 7 C 3.460916 2.932176 8 D 1.734939 3.782025 9 D 2.313147 2.973996 10 D 2.554338 3.271109 11 D 4.224082 3.374961 12 E 3.359814 2.313307 13 E 3.400771 4.837787 14 E 3.110683 4.153373 summary(mydt) name var1 var2 A:1 Min. :1.735 Min. :2.033 B:2 1st Qu.:2.608 1st Qu.:3.048 C:4 Median :3.120 Median :3.486 D:4 Mean :3.203 Mean :3.688 E:3 3rd Qu.:3.446 3rd Qu.:4.412 Max. :4.715 Max. :5.787 I want to get rid of A, B, E from the data as they are incomplete. Thus expected output: name var1 var2 4 C 3.070508 2.033383 5 C 3.129288 4.701356 6 C 4.715065 3.527209 7 C 3.460916 2.932176 8 D 1.734939 3.782025 9 D 2.313147 2.973996 10 D 2.554338 3.271109 11 D 4.224082 3.374961 Please note the dataset is big, the following may not a option: mydt[mydt$name == "C",] mydt[mydt$name == "D", ]

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• Webalizer causing high CPU load

  - by Tom

  We use webalizer to generate reports on our Apache access logs - it is useful in conjunction with Google Analytics. The problem is that webalizer uses ALOT of CPU when running. If I run top I can see two perl processes with 90% CPU - this slows down the machine and therefore the website for our users. Webalizer is run via a daily cron job (/etc/cron.daily/00webalizer): #! /bin/bash # update access statistics for the web site if [ -s /var/log/httpd/access_log ]; then exec /usr/bin/webalizer -Q fi Does anyone know how to limit how much CPU webalizer can use? For example, would nice help and how would I use it?

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• Cannot start serial over lan on iDrac6

  - by Bryan Agee

  I have a couple of Dell R610/R710 servers loaded with iDrac6 system management boards. I figured out how to log into the SM CLP with ssh. According to the dell documentation, I should be able to start a console session by running: start /system1/sol1 but I get the following failure message: cmdstat status : 3 status_tag : COMMAND EXECUTION FAILED job job_id : 12 joberr errtype : 1 errtype_desc : Other cimstat : 6 cimstat_desc : CIM_ERR_NOT_FOUND severity : 2 severity_desc : Low /system1/sol1 started FAILED at Sun Sep 16 00:20:58 2012 I have enabled the serial-over-lan via the web interface and rebooted, but nothing seems to make them available.

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• Can't add client machine to windows server 2008 domain controller

  - by Patrick J Collins

  A bit of background before I dive into the gritty details: I have a single server running Windows 2003 Server where I host my ASP.net website and SQL Server + Reports. I've been creating ordinary windows user accounts to authenticate my users, and I enabled integrated windows authentication with impersonation. I've set up a bunch of user groups which correspond to certain roles (admin, power user, normal user, etc) and I test membership to enable or disable certain features. Overall, I'm pretty happy with the solution, it was quick to setup and I don't have to worry about messing around storing passwords and whatnot. Well, what I'm trying to do now is set up a new environment with 3 servers (Web, SQL, Reports) and I'd like these three servers to share common user accounts. I understand that I could add these three machines to a domain, which means installing Active Directory on one of the machines. I am barking up the wrong tree here? Would you suggest an alternative configuration? Assuming that I stick with AD, I have a couple of questions regarding DNS. To be honest, I'd rather not fiddle around with the DNS settings because my ISP already has their own DNS server which works just fine. It would appear however that DNS and AD are intertwined. Firstly, if I am to create a new domain in called mycompany.net, do I actually need to be the registered owner of that domain name and ensure the DNS entry points to the IP address of the machine hosting AD? Secondly, for the two other machines that I am trying to add to the domain, do I need to fiddle with their DNS settings? I've tried setting the preferred DNS Server IP address to that of my newly installed AD, but no luck. At this point, I can't add the two other machines to the domain. Here are some diagnostics that I have run based on a few suggestions I read on forums (sorry they're in French, although I could translate if needed). I ran nltest, which seems to indicate that the client can discover the domain controller. When I run dcdiag, the call to DsGetDcName fails with error 1722, not really sure what that means. Any suggestions? Thanks! C:\Users\Administrator>nltest /dsgetdc:mycompany.net Contrôleur de domaine : \\REPORTS.mycompany.net Adresse : \\111.111.111.111 GUID dom : 3333a4ec-ca56-4f02-bb9e-76c29c6c3832 Nom dom : mycompany.net Nom de la forêt : mycompany.net Nom de site du contrôleur de domaine : Default-First-Site-Name Nom de notre site : Default-First-Site-Name Indicateurs : PDC GC DS LDAP KDC TIMESERV WRITABLE DNS_DC DNS_DOMAIN DNS _FOREST CLOSE_SITE FULL_SECRET La commande a été correctement exécutée C:\Users\Administrator>dcdiag /s:mycompany.net /u: mycompany.net \pcollins /p:somepass Diagnostic du serveur d'annuaire Exécution de l'installation initiale : * Forêt AD identifiée. Collecte des informations initiales terminée. Exécution des tests initiaux nécessaires Test du serveur : Default-First-Site-Name\REPORTS Démarrage du test : Connectivity ......................... Le test Connectivity de REPORTS a réussi Exécution des tests principaux Test du serveur : Default-First-Site-Name\REPORTS Démarrage du test : Advertising Erreur irrécupérable : l'appel DsGetDcName (REPORTS) a échoué ; erreur 1722 Le localisateur n'a pas pu trouver le serveur. ......................... Le test Advertising de REPORTS a échoué Démarrage du test : FrsEvent Impossible d'interroger le journal des événements File Replication Service sur le serveur REPORTS.mycompany.net. Erreur 0x6ba « Le serveur RPC n'est pas disponible. » ......................... Le test FrsEvent de REPORTS a échoué Démarrage du test : DFSREvent Impossible d'interroger le journal des événements DFS Replication sur le serveur REPORTS.mycompany.net. Erreur 0x6ba « Le serveur RPC n'est pas disponible. » ......................... Le test DFSREvent de REPORTS a échoué Démarrage du test : SysVolCheck [REPORTS] Une opération net use ou LsaPolicy a échoué avec l'erreur 53, Le chemin réseau n'a pas été trouvé.. ......................... Le test SysVolCheck de REPORTS a échoué Démarrage du test : KccEvent Impossible d'interroger le journal des événements Directory Service sur le serveur REPORTS.mycompany.net. Erreur 0x6ba « Le serveur RPC n'est pas disponible. » ......................... Le test KccEvent de REPORTS a échoué Démarrage du test : KnowsOfRoleHolders ......................... Le test KnowsOfRoleHolders de REPORTS a réussi Démarrage du test : MachineAccount Impossible d'ouvrir le canal avec [REPORTS] : échec avec l'erreur 53 : Le chemin réseau n'a pas été trouvé. Impossible d'obtenir le nom de domaine NetBIOS Échec : impossible de tester le nom principal de service (SPN) HOST Échec : impossible de tester le nom principal de service (SPN) HOST ......................... Le test MachineAccount de REPORTS a réussi Démarrage du test : NCSecDesc ......................... Le test NCSecDesc de REPORTS a réussi Démarrage du test : NetLogons [REPORTS] Une opération net use ou LsaPolicy a échoué avec l'erreur 53, Le chemin réseau n'a pas été trouvé.. ......................... Le test NetLogons de REPORTS a échoué Démarrage du test : ObjectsReplicated ......................... Le test ObjectsReplicated de REPORTS a réussi Démarrage du test : Replications ......................... Le test Replications de REPORTS a réussi Démarrage du test : RidManager ......................... Le test RidManager de REPORTS a réussi Démarrage du test : Services Impossible d'ouvrir IPC distant à [REPORTS.mycompany.net] : erreur 0x35 « Le chemin réseau n'a pas été trouvé. » ......................... Le test Services de REPORTS a échoué Démarrage du test : SystemLog Impossible d'interroger le journal des événements System sur le serveur REPORTS.mycompany.net. Erreur 0x6ba « Le serveur RPC n'est pas disponible. » ......................... Le test SystemLog de REPORTS a échoué Démarrage du test : VerifyReferences ......................... Le test VerifyReferences de REPORTS a réussi Exécution de tests de partitions sur ForestDnsZones Démarrage du test : CheckSDRefDom ......................... Le test CheckSDRefDom de ForestDnsZones a réussi Démarrage du test : CrossRefValidation ......................... Le test CrossRefValidation de ForestDnsZones a réussi Exécution de tests de partitions sur DomainDnsZones Démarrage du test : CheckSDRefDom ......................... Le test CheckSDRefDom de DomainDnsZones a réussi Démarrage du test : CrossRefValidation ......................... Le test CrossRefValidation de DomainDnsZones a réussi Exécution de tests de partitions sur Schema Démarrage du test : CheckSDRefDom ......................... Le test CheckSDRefDom de Schema a réussi Démarrage du test : CrossRefValidation ......................... Le test CrossRefValidation de Schema a réussi Exécution de tests de partitions sur Configuration Démarrage du test : CheckSDRefDom ......................... Le test CheckSDRefDom de Configuration a réussi Démarrage du test : CrossRefValidation ......................... Le test CrossRefValidation de Configuration a réussi Exécution de tests de partitions sur mycompany Démarrage du test : CheckSDRefDom ......................... Le test CheckSDRefDom de mycompany a réussi Démarrage du test : CrossRefValidation ......................... Le test CrossRefValidation de mycompany a réussi Exécution de tests d'entreprise sur mycompany.net Démarrage du test : LocatorCheck Avertissement : l'appel DcGetDcName(GC_SERVER_REQUIRED) a échoué ; erreur 1722 Serveur de catalogue global introuvable - Les catalogues globaux ne fonctionnent pas. Avertissement : l'appel DcGetDcName(PDC_REQUIRED) a échoué ; erreur 1722 Contrôleur principal de domaine introuvable. Le serveur contenant le rôle PDC ne fonctionne pas. Avertissement : l'appel DcGetDcName(TIME_SERVER) a échoué ; erreur 1722 Serveur de temps introuvable. Le serveur contenant le rôle PDC ne fonctionne pas. Avertissement : l'appel DcGetDcName(GOOD_TIME_SERVER_PREFERRED) a échoué ; erreur 1722 Serveur de temps introuvable. Avertissement : l'appel DcGetDcName(KDC_REQUIRED) a échoué ; erreur 1722 Centre de distribution de clés introuvable : les centres de distribution de clés ne fonctionnent pas. ......................... Le test LocatorCheck de mycompany.net a échoué Démarrage du test : Intersite ......................... Le test Intersite de mycompany.net a réussi Update 1 : I am under the distinct impression that the problem is caused by some security settings. I have read elsewhere that the client needs to be able to access the fileshare sysvol. I had to enable Client for Microsoft Windows and File and Printer Sharing which were previously disabled. When I now run dcdiag the Advertising test works, which I suppose is forward progress. It currently chokes on the Services step (unable to open remote IPC). Démarrage du test : Services Impossible d'ouvrir IPC distant à [REPORTS.locbus.net] : erreur 0x35 « Le chemin réseau n'a pas été trouvé. » ......................... Le test Services de REPORTS a échoué The original English version of that error message : Could not open Remote ipc to [server] Update 2 : I attach some more diagnostics : Netsetup.log (client): 09/24/2009 13:27:09:773 ----------------------------------------------------------------- 09/24/2009 13:27:09:773 NetpValidateName: checking to see if 'WEB' is valid as type 1 name 09/24/2009 13:27:12:773 NetpCheckNetBiosNameNotInUse for 'WEB' [MACHINE] returned 0x0 09/24/2009 13:27:12:773 NetpValidateName: name 'WEB' is valid for type 1 09/24/2009 13:27:12:805 ----------------------------------------------------------------- 09/24/2009 13:27:12:805 NetpValidateName: checking to see if 'WEB' is valid as type 5 name 09/24/2009 13:27:12:805 NetpValidateName: name 'WEB' is valid for type 5 09/24/2009 13:27:12:852 ----------------------------------------------------------------- 09/24/2009 13:27:12:852 NetpValidateName: checking to see if 'MYCOMPANY.NET' is valid as type 3 name 09/24/2009 13:27:12:992 NetpCheckDomainNameIsValid [ Exists ] for 'MYCOMPANY.NET' returned 0x0 09/24/2009 13:27:12:992 NetpValidateName: name 'MYCOMPANY.NET' is valid for type 3 09/24/2009 13:27:21:320 ----------------------------------------------------------------- 09/24/2009 13:27:21:320 NetpDoDomainJoin 09/24/2009 13:27:21:320 NetpMachineValidToJoin: 'WEB' 09/24/2009 13:27:21:320 OS Version: 6.0 09/24/2009 13:27:21:320 Build number: 6002 09/24/2009 13:27:21:320 ServicePack: Service Pack 2 09/24/2009 13:27:21:414 SKU: Windows Server® 2008 Standard 09/24/2009 13:27:21:414 NetpDomainJoinLicensingCheck: ulLicenseValue=1, Status: 0x0 09/24/2009 13:27:21:414 NetpGetLsaPrimaryDomain: status: 0x0 09/24/2009 13:27:21:414 NetpMachineValidToJoin: status: 0x0 09/24/2009 13:27:21:414 NetpJoinDomain 09/24/2009 13:27:21:414 Machine: WEB 09/24/2009 13:27:21:414 Domain: MYCOMPANY.NET 09/24/2009 13:27:21:414 MachineAccountOU: (NULL) 09/24/2009 13:27:21:414 Account: MYCOMPANY.NET\pcollins 09/24/2009 13:27:21:414 Options: 0x25 09/24/2009 13:27:21:414 NetpLoadParameters: loading registry parameters... 09/24/2009 13:27:21:414 NetpLoadParameters: DNSNameResolutionRequired not found, defaulting to '1' 0x2 09/24/2009 13:27:21:414 NetpLoadParameters: status: 0x2 09/24/2009 13:27:21:414 NetpValidateName: checking to see if 'MYCOMPANY.NET' is valid as type 3 name 09/24/2009 13:27:21:523 NetpCheckDomainNameIsValid [ Exists ] for 'MYCOMPANY.NET' returned 0x0 09/24/2009 13:27:21:523 NetpValidateName: name 'MYCOMPANY.NET' is valid for type 3 09/24/2009 13:27:21:523 NetpDsGetDcName: trying to find DC in domain 'MYCOMPANY.NET', flags: 0x40001010 09/24/2009 13:27:22:039 NetpDsGetDcName: failed to find a DC having account 'WEB$': 0x525, last error is 0x79 09/24/2009 13:27:22:039 NetpDsGetDcName: status of verifying DNS A record name resolution for 'KING.MYCOMPANY.NET': 0x0 09/24/2009 13:27:22:039 NetpDsGetDcName: found DC '\\KING.MYCOMPANY.NET' in the specified domain 09/24/2009 13:27:30:039 NetUseAdd to \\KING.MYCOMPANY.NET\IPC$ returned 53 09/24/2009 13:27:30:039 NetpJoinDomain: status of connecting to dc '\\KING.MYCOMPANY.NET': 0x35 09/24/2009 13:27:30:039 NetpDoDomainJoin: status: 0x35 09/24/2009 13:27:30:148 ----------------------------------------------------------------- ipconfig /all (on client): Configuration IP de Windows Nom de l'hôte . . . . . . . . . . : WEB Suffixe DNS principal . . . . . . : Type de noeud. . . . . . . . . . : Hybride Routage IP activé . . . . . . . . : Non Proxy WINS activé . . . . . . . . : Non Carte Ethernet Connexion au réseau local : Suffixe DNS propre à la connexion. . . : Description. . . . . . . . . . . . . . : Intel 21140-Based PCI Fast Ethernet Adapter (Emulated) Adresse physique . . . . . . . . . . . : **-15-5D-A1-17-** DHCP activé. . . . . . . . . . . . . . : Non Configuration automatique activée. . . : Oui Adresse IPv4. . . . . . . . . . . : **.***.163.122(préféré) Masque de sous-réseau. . . . . . . . . : 255.255.255.0 Passerelle par défaut. . . . . . . . . : **.***.163.2 Serveurs DNS. . . . . . . . . . . . . : **.***.163.123 NetBIOS sur Tcpip. . . . . . . . . . . : Activé ipconfig /all (on server): Configuration IP de Windows Nom de l'hôte . . . . . . . . . . : KING Suffixe DNS principal . . . . . . : mycompany.net Type de noeud. . . . . . . . . . : Hybride Routage IP activé . . . . . . . . : Non Proxy WINS activé . . . . . . . . : Non Liste de recherche du suffixe DNS.: locbus.net Carte Ethernet Connexion au réseau local : Suffixe DNS propre à la connexion. . . : Description. . . . . . . . . . . . . . : Intel 21140-Based PCI Fast Ethernet Adapter (Emulated) Adresse physique . . . . . . . . . . . : **-15-5D-A1-1E-** DHCP activé. . . . . . . . . . . . . . : Non Configuration automatique activée. . . : Oui Adresse IPv4. . . . . . . . . . . : **.***.163.123(préféré) Masque de sous-réseau. . . . . . . . . : 255.255.255.0 Passerelle par défaut. . . . . . . . . : **.***.163.2 Serveurs DNS. . . . . . . . . . . . . : 127.0.0.1 NetBIOS sur Tcpip. . . . . . . . . . . : Activé nslookup (on client): Serveur : *******.***.com Address: **.***.163.123 Nom : mycompany.net Addresses: ****:****:a37b::****:a37b **.****.163.123

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• How to delete the history and cache in Opera Mobile (10.1)

  - by Mathias Lin

  I run Opera Mobile 10.1 on Android. My device is rooted. How can I clear the history and cache of the browser via shell? As su, removing /data/data/com.opera.browser/opera/profiles/smartphone/cookies4.dat /data/data/com.opera.browser/opera/profiles/smartphone/cache /data/data/com.opera.browser/opera/profiles/smartphone/cacheO and a /system/xbin/busybox killall -9 com.opera.browser afterwards doesn't seem to do the job. Afterwards, bookmarks etc. are still there. In Opera Mini I found it easy to just delete /data/data/com.opera.mini.android/cache/webviewCache /data/data/com.opera.mini.android/databases but unfortunately, Opera Mini in it's current version has a bug and doesn't work on most devices.

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• Best 'Remember the milk' client for Windows XP

  - by n0v1c3c0d3r

  I'm a user of RTM (Remember The Milk). Since I have Windows 7 at home, I'm using a Windows Sidebar gadget ('Forget the milk'). But as I'm using Win XP at office, I cannot use the gadget. I am looking for an RTM client for Windows XP. I have used a software running on Adobe AIR, which requires to go to the RTM site every time to add a job. Is there any other effective clients for XP which can at least: Add a task Delete a task without visiting the site every time.

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• How can I install the latest full version of Canon ZoomBrowser EX without the original CD?

  - by Sorin Sbarnea

  ZoomBrowser EX comes with Canon cameras. Canon software enigeering team did a really poor job analyzing how people are using the software: people do lose their x-year old CD or do not have it with them when travelling do not have a CD drive at all (very common nowdays) Canon updater from their website does not allow you to install the software if it does not find the original CD in the drive. The question is how do I trick the installer to run on a computer and install the product that I payed for. Currently the latest version is 6.5.1.15 and you can download the updater from Canon website. In fact the updater is just the full installer but it doesn't allow you to install if it doesn't find a previous install or the original CD. Note: In the past I used to save a registry file with registry keys used by it, loading it did allowed me to run the installer but now, with Windows 7 x64 it seams that it doesn't work anymore.

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