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[MAPREDUCE-4490] JVM reuse is incompatible with LinuxTaskController (and therefore incompatible with Security) - MapReduce - [issue]
...When using LinuxTaskController, JVM reuse (mapred.job.reuse.jvm.num.tasks > 1) with more map tasks in a job than there are map slots in the cluster will result in immediate task failures ...
http://issues.apache.org/jira/browse/MAPREDUCE-4490    Author: George Datskos, 2014-06-13, 22:38
Re: S3N copy creating recursive folders - MapReduce - [mail # user]
...Subroto and Shumin  Try adding a slash to to the s3n source:  - hadoop fs -cp s3n://acessKey:[EMAIL PROTECTED]/srcData"  /test/srcData + hadoop fs -cp s3n://acessKey:[EMAIL PR...
   Author: George Datskos, 2013-03-07, 07:51
Re: some ideas for QJM and NFS - MapReduce - [mail # user]
...Hi Azuryy,  So you have measurements for hadoop-1.0.4 and hadoop-2.0.3+QJM, but I  think you should also measure hadoop-2.0.3 _wihout_ QJM so you can know  for sure if the per...
   Author: George Datskos, 2013-02-18, 06:47
Re: Question related to Decompressor interface - MapReduce - [mail # user]
...Hello   The BlockDecompressorStream class is used for block-based decompression  (e.g. snappy).  Each chunk has a header indicating how many bytes it is.  That header is ...
   Author: George Datskos, 2013-02-13, 00:58
Re: xcievers - MapReduce - [mail # user]
...Patai,   You can use the getDataNodeStats() method of your your  DistributedFileSystem instance.  It returns an array of DatanodeInfo  which contains, among other things,...
   Author: George Datskos, 2013-02-08, 00:07
[MAPREDUCE-4497] JobTracker webUI "Kill Selected Jobs" button has no effect - MapReduce - [issue]
...When enabling the webinterface.private.actions property to true, the JobTracker displays additional buttons allowing the user to (1) kill jobs or (2) change the priority of a job.  Howe...
http://issues.apache.org/jira/browse/MAPREDUCE-4497    Author: George Datskos, 2012-07-31, 00:21
Re: How to get the HDFS I/O information - MapReduce - [mail # user]
...Qu,  Every job has a history file that is, by default, stored under  $HADOOP_LOG_DIR/history.  These "job history" files list the amount of  hdfs read/write (and lots of ...
   Author: George Datskos, 2012-04-25, 01:06
Re: Reducer not firing - MapReduce - [mail # user]
...Arko,  Change Iterator to Iterable   George   On 2012/04/18 8:16, Arko Provo Mukherjee wrote:...
   Author: George Datskos, 2012-04-17, 23:59
Re: Run mapreq job without hadoop script - MapReduce - [mail # user]
...Yes you can this.  Take a look at JobClient.runJob and JobClient.submitJob.   George  On 2012/04/06 7:50, GUOJUN Zhu wrote:...
   Author: George Datskos, 2012-04-05, 23:57
[expand - 2 more] - Re: Best practices configuring libraries on the backend. - MapReduce - [mail # user]
...Dmitriy  I've tested it on hadoop 1.0.0 and 1.0.1.  (I don't know which version  cdh3u3 is based off of)  In hadoop-env.sh if I set  HADOOP_TASKTRACKER_OPTS="-Djava....
   Author: George Datskos, 2012-03-29, 00:04
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