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[expand - 1 more] - Re: HDFS Errors - MapReduce - [mail # user]
...On Jun 22, 2010, at 1:58 PM, Steve Lewis wrote:   OK, so you are out of safemode.     This just re-reads the list of nodes.  hadoop dfsadmin -report might be mor e useful...
   Author: Allen Wittenauer, 2010-06-22, 22:13
Re: how to set max map tasks individually for each job? - MapReduce - [mail # user]
...On Jun 3, 2010, at 1:45 AM, Alex Munteanu wrote:   IIRC, 0.21+capacity scheduler has some capabilities that might be useful he re.  You can set a (global) default heap size per tas...
   Author: Allen Wittenauer, 2010-06-05, 05:56
[expand - 1 more] - Re: Do we shoot ourselves by using all task slots? - MapReduce - [mail # user]
...On May 28, 2010, at 11:43 AM, Todd Lipcon wrote:  duling" - essentially, it will wait for a few seconds when a slot opens up  to try to find a local task before assigning a non-loc...
   Author: Allen Wittenauer, 2010-05-28, 18:54
Re: Separate communications of HDFS and MapReduce - MapReduce - [mail # user]
...On Apr 26, 2010, at 6:23 AM, Druilhe Remi wrote:  and MapReduce communications and I am not able to distinguish which packet  belong to HDFS or to MapReduce.  This shouldn't b...
   Author: Allen Wittenauer, 2010-04-26, 18:10
Re: Distributed Cache - MapReduce - [mail # user]
...On Apr 2, 2010, at 11:44 PM, Raja Thiruvathuru wrote: /guest/lib/userlib.jar"), conf);  localhost?  really?...
   Author: Allen Wittenauer, 2010-04-03, 18:11
[MAPREDUCE-1666] job output chroot support - MapReduce - [issue]
...It would be useful to be able to submit the same job and have it chroot the output to a different base directory before execution.  This would allow for input to be the same, but output...
http://issues.apache.org/jira/browse/MAPREDUCE-1666    Author: Allen Wittenauer, 2010-04-01, 22:13
Re: Setting the group for output files - MapReduce - [mail # user]
...  On 3/11/10 11:05 AM, "Gregory Lawrence"  wrote:  HDFS uses sticky groups for directories.  In other words, on creation, the group of the dir is what the group of the fi...
   Author: Allen Wittenauer, 2010-03-11, 19:08
Re: Moving HDFS raid package from HDFS repository to MAPREDUCE repository - MapReduce - [mail # dev]
...On 1/22/10 10:49 AM, "Dhruba Borthakur"  wrote:   Am I reading this correctly:  we're moving HDFS RAID to MR because the *test code* fails?...
   Author: Allen Wittenauer, 2010-01-22, 18:55
[expand - 1 more] - Re: Question about setting the number of mappers. - MapReduce - [mail # user]
...This means that -every node- can have 10 map tasks and 10 reduce tasks running simultaneously.  If you want to limit how many tasks run -per node- in order to change the performance pro...
   Author: Allen Wittenauer, 2010-01-19, 21:47
Re: why one mapper process per block? - MapReduce - [mail # dev]
...  On 1/15/10 3:55 PM, "Erez Katz"  wrote:  Probably just setting mapred.min.split.size to a high enough value....
   Author: Allen Wittenauer, 2010-01-16, 00:00
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Allen Wittenauer
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