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[MAPREDUCE-4798] TestJobHistoryServer fails some times with 'java.lang.AssertionError: Address already in use' - MapReduce - [issue]
...UT Failure in IHC 1.0.3: org.apache.hadoop.mapred.TestJobHistoryServer. This UT fails sometimes.The error message is:'Testcase: testHistoryServerStandalone took 5.376 sec Caused an ERRORAddr...
http://issues.apache.org/jira/browse/MAPREDUCE-4798    Author: sam liu, 2014-01-28, 05:42
What are the methods to share dynamic data among mappers/reducers? - MapReduce - [mail # user]
...Hi,  As I know, the Distributed Cache will copy the shared data to the slaves before starting job, and won't change the shared data after that.  So are there any solutions to share...
   Author: sam liu, 2014-01-02, 09:42
How to set the handler count related parameters? - MapReduce - [mail # user]
...Hi,  We have 20 nodes cluster(1 namenode, 1 jobtracker, 18 datanodes).  Each node has 20 cpu cores and 64 GB memory.  How to set the values for following parameters?  - &...
   Author: sam liu, 2013-12-22, 13:20
hdfs unable to create new block with 'Too many open fiiles' exception - MapReduce - [mail # user]
...Hi Experts,  We failed to run an MR job which accesses hive, as hdfs is unable to create new block during reduce phase. The exceptions:   1) In tasklog: hdfs.DFSClient: DataStreame...
   Author: sam liu, 2013-12-21, 16:30
Re: About conception and usage of Uber - MapReduce - [mail # user]
...Any comments/corrections on my understanding on Uber?  Thanks in advance!   2013/11/8 sam liu  ...
   Author: sam liu, 2013-11-11, 01:35
Re: Hang when add/remove a datanode into/from a 2 datanode cluster - MapReduce - [mail # user]
...Yes, you are correct: using fsck tool I found some files in my cluster expected more replications than the value defined in dfs.replication. If I set the expected replication of this files t...
   Author: sam liu, 2013-10-30, 03:19
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
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