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Re: controlling no. of mapper tasks - MapReduce - [mail # user]
...On Jun 20, 2011, at 12:24 PM,    wrote:  tasks and hadoop honours it but "mapred.map.tasks" is not honoured by  Hadoop. Is there any way to control number of map tasks? W...
   Author: Allen Wittenauer, 2011-06-22, 17:06
Re: concurrent job execution - MapReduce - [mail # user]
...On Jun 3, 2011, at 1:11 AM, Felix Sprick wrote:  application.   In addition to moving from the FIFO/default scheduler, make sure  your GUI application actually submits the job...
   Author: Allen Wittenauer, 2011-06-06, 22:09
[expand - 1 more] - Re: distributed cache exceeding local.cache.size - MapReduce - [mail # user]
...On Apr 1, 2011, at 12:05 PM, Travis Crawford wrote:  wrote: datasets job things the map reduce spill space.  It seems to be the only reliable way to  prevent MR from going nut...
   Author: Allen Wittenauer, 2011-04-01, 21:12
Re: map tasks vs launched map tasks - MapReduce - [mail # user]
...On Mar 25, 2011, at 10:09 AM, Pedro Costa wrote:   Probably speculative execution...
   Author: Allen Wittenauer, 2011-03-25, 21:04
Re: A way to monitor HDFS for a file to come live, and then kick off a job? - MapReduce - [mail # user]
...On Mar 24, 2011, at 10:09 AM, Jonathan Coveney wrote:   A better choice would likely be hdfs-user@, since this is really  about watching files in HDFS.   job. that wondering ...
   Author: Allen Wittenauer, 2011-03-25, 16:46
Re: How to add a new node to cluster? - MapReduce - [mail # dev]
...On Mar 5, 2011, at 4:13 AM, 周俊清 wrote:   See Question 6 in the FAQ:  http://wiki.apache.org/hadoop/FAQ  ...
   Author: Allen Wittenauer, 2011-03-18, 00:07
Re: JobTracker memory usage peaks once a day and OOM sometimes - MapReduce - [mail # dev]
...On Feb 8, 2011, at 8:59 AM, Maxim Zizin wrote:   in our Hadoop cluster. JT's heap size is set to 2000m. About 18 hours a da y it uses ~1GB but every day roughly at the minute it was sta...
   Author: Allen Wittenauer, 2011-02-08, 20:16
[expand - 1 more] - Re: any plans to deploy OSGi bundles on cluster? - MapReduce - [mail # user]
...On Jan 4, 2011, at 10:30 AM, Hiller, Dean (Contractor) wrote:   I don't use the JVM re-use options, but I'm 99% certain that the task JVM's  are not shared between jobs.  ...
   Author: Allen Wittenauer, 2011-01-04, 20:08
Re: large intermediate outputs - MapReduce - [mail # user]
...On Jan 3, 2011, at 5:11 AM, Debbie Fu wrote:  op   Not in a way that saves the job.  job   Yes.   You can point it to an NFS mount, but that'd be suicide.   Be...
   Author: Allen Wittenauer, 2011-01-04, 04:32
[expand - 1 more] - Re: Reduce Task Priority / Scheduler - MapReduce - [mail # user]
...This makes sense until you realize:   a) It won't scale.   b) Machines fail.  On Dec 20, 2010, at 5:26 AM, Martin Becker wrote:  ote: rote: view). e:  wrote: ? ce ...
   Author: Allen Wittenauer, 2010-12-20, 19:28
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