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[expand - 1 more] - Re: Yarn never use TeraSort#TotalOrderPartitioner when run TeraSort job? - MapReduce - [mail # user]
...It's really weird and confusing me. Anyone can help this question?  Thanks!   2013/10/16 sam liu  ...
   Author: sam liu, 2013-10-18, 03:12
[MAPREDUCE-5506] Hadoop-1.1.1 occurs ArrayIndexOutOfBoundsException with MultithreadedMapRunner - MapReduce - [issue]
...After I set: 'jobConf.setMapRunnerClass(MultithreadedMapRunner.class);' in MR app 'mapred.map.multithreadedrunner.threads = 2' in mapred-site.xmlA simple MR app failed as its Map task encoun...
http://issues.apache.org/jira/browse/MAPREDUCE-5506    Author: sam liu, 2013-09-16, 17:24
Re: UnsupportedOperationException occurs with Hadoop-2.1.0-beta jar files - MapReduce - [mail # user]
...This is an env issue. Hadoop-2.10-beta upgraded protobuf to 2.5 from 2.4.1, but the version of  protobuf  in my env is still 2.4.1, so the sqoop unit tests failed on my env. After ...
   Author: sam liu, 2013-09-10, 03:27
How to get username/jobid/taskid/localdir in LinuxTaskController#createLogDir? - MapReduce - [mail # user]
...Hi Developers,  This is an issue when I prepare a patch for MAPREDUCE-4490, and I added following comments in that JIRA, but no response so far. We are eager to resolve this issue in ou...
   Author: sam liu, 2013-08-22, 03:01
[expand - 1 more] - Re: Parameter 'yarn.nodemanager.resource.cpu-cores' does not work - MapReduce - [mail # user]
...Hi Sandy,  Thanks to your detailed explanation! But I am still not very clear. In my current cluster with Hadoop-2.0.3-alpha, how to enable the properties 'yarn.nodemanager.resource.cpu...
   Author: sam liu, 2013-07-23, 03:01
[expand - 1 more] - Re: How to write/run MPI program on Yarn? - MapReduce - [mail # user]
...Thanks Pramod and Clark!  1. What's the relationship of Hadoop 2.x branch and mpich2-yarn project? 2. Does Hadoop 2.x branch plan to include MPI implementation? I mentioned there is alr...
   Author: sam liu, 2013-07-01, 02:48
[MAPREDUCE-5026] For shortening the time of TaskTracker heartbeat, decouple the statics collection operations - MapReduce - [issue]
...In each heartbeat of TaskTracker, it will calculate some system statics, like the free disk space, available virtual/physical memory, cpu usage, etc. However, it's not necessary to calculate...
http://issues.apache.org/jira/browse/MAPREDUCE-5026    Author: sam liu, 2013-06-28, 02:43
How Yarn execute MRv1 job? - MapReduce - [mail # user]
...Hi,  1.In Hadoop 1.x, a job will be executed by map task and reduce task together, with a typical process(map > shuffle > reduce). In Yarn, as I know, a MRv1 job will be executed ...
   Author: sam liu, 2013-06-19, 02:46
[expand - 2 more] - Re: Why my tests shows Yarn is worse than MRv1 for terasort? - MapReduce - [mail # user]
...Hi Harsh,  Thanks for your detailed response! Now, the efficiency of my Yarn cluster improved a lot after increasing the reducer number(mapreduce.job.reduces) in mapred-site.xml. But I ...
   Author: sam liu, 2013-06-18, 08:58
[expand - 2 more] - Re: The minimum memory requirements to datanode and namenode? - MapReduce - [mail # user]
...I can issue a command 'hadoop dfsadmin -report', but it did not return any result for a long time. Also, I can open the NN UI(http://namenode:50070), but it is always keeping in the connecti...
   Author: sam liu, 2013-05-13, 06:22
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB