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Re: speculative execution in yarn - MapReduce - [mail # user]
...Speculative execution is a per-job concept, so in 2.* release line, it  is MR AM's responsibility.  Because there is a two level scheduling - one at RM and one at AM, AMs  hav...
   Author: Vinod Kumar Vavilapalli, 2012-10-17, 18:28
Re: GroupingComparator - MapReduce - [mail # user]
...On Oct 15, 2012, at 12:27 PM, Dave Beech wrote:    Yes, it is a bit counter intuitive. In the older API, there is no way to  find out the current key corresponding to the curr...
   Author: Vinod Kumar Vavilapalli, 2012-10-16, 18:44
[expand - 1 more] - Re: DFS respond very slow - MapReduce - [mail # user]
...I just realized one more thing. You mentioned "disk is 700Gb RAID".  How  many disks overall? What RAID configuration? Usually we advocate JBOD  with hadoop to avoid performan...
   Author: Vinod Kumar Vavilapalli, 2012-10-16, 02:36
Re: Suitability of HDFS for live file store - MapReduce - [mail # user]
...For your original use case, HDFS indeed sounded like an overkill. But  once you start thinking of thumbnail generation, PDFs etc, MapReduce  obviously fits the bill.  If you w...
   Author: Vinod Kumar Vavilapalli, 2012-10-15, 23:25
Re: possible resource leak in capacity scheduler - MapReduce - [mail # user]
...Which version are you running? Can you enabled debug logging for RM and  see what's happening?  Thanks, +Vinod Kumar Vavilapalli Hortonworks Inc. http://hortonworks.com/  On O...
   Author: Vinod Kumar Vavilapalli, 2012-10-15, 23:13
Re: API Design: getClusterMetrics - MapReduce - [mail # dev]
...This is to help evolve the APIs easily. All apis have request and  response objects, instead of passing in parameters directly. Some of the  APIs clearly may not need this extra la...
   Author: Vinod Kumar Vavilapalli, 2012-10-10, 19:47
Re: Run mr example wordcount error on hadoop-2.0.1 alpha HA - MapReduce - [mail # user]
...The console output as well as the AM logs show that the TaskAttempts are  failing because they are out of heap-space. See your configuration  below, you should bump them up.  ...
   Author: Vinod Kumar Vavilapalli, 2012-09-14, 17:43
Re: Can't run PI example on hadoop 0.23.1 - MapReduce - [mail # user]
...The AM corresponding to your MR job is failing continuously. Can you  check the container logs for your AM ? They should be in  ${yarn.nodemanager.log-dirs}/${application-id}/conta...
   Author: Vinod Kumar Vavilapalli, 2012-09-10, 22:53
Re: Counters across all jobs - MapReduce - [mail # user]
...Counters are per-job in Hadoop MapReduce. You need an external  aggregator for such cross-job counters - for e.g. a node in Zookeeper.  Also, is it just for display or your job-log...
   Author: Vinod Kumar Vavilapalli, 2012-09-10, 17:46
[expand - 2 more] - Re: build failure - trying to build hadoop trunk checkout - MapReduce - [mail # user]
...On Sep 10, 2012, at 2:43 AM, Tony Burton wrote:  this happens in Kerberos?)   As part of authenticating and generating tokens for clients, Kerberos  needs, besides many other ...
   Author: Vinod Kumar Vavilapalli, 2012-09-10, 17:43
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