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Re: Filesystem closed exception - MapReduce - [mail # user]
...FS Caching is enabled on the cluster (i.e. the default is not changed).  Our code isn't actually mapper code, but a standalone java program being run as part of Oozie. It just seemed co...
   Author: Hemanth Yamijala, 2013-01-31, 04:28
Re: How to find Blacklisted Nodes via cli. - MapReduce - [mail # user]
...Hi,  Part answer: you can get the blacklisted tasktrackers using the command line:  mapred job -list-blacklisted-trackers.  Also, I think that a blacklisted tasktracker become...
   Author: Hemanth Yamijala, 2013-01-31, 04:25
Re: TT nodes distributed cache failure - MapReduce - [mail # user]
...Could you post the stack trace from the job logs. Also looking at the task tracker logs on the failed nodes may help.  Thanks Hemanth  On Friday, January 25, 2013, Terry Healy wrot...
   Author: Hemanth Yamijala, 2013-01-26, 07:25
Re: mappers-node relationship - MapReduce - [mail # user]
...This may beof some use, about how maps are decided:  http://wiki.apache.org/hadoop/HowManyMapsAndReduces  Thanks Hemanth  On Friday, January 25, 2013, jamal sasha wrote:  ...
   Author: Hemanth Yamijala, 2013-01-26, 07:21
Re: passing arguments to hadoop job - MapReduce - [mail # user]
...Hi,  Please note that you are referring to a very old version of Hadoop. the current stable release is Hadoop 1.x. The API has changed in 1.x. Take a look at the wordcount example here:...
   Author: Hemanth Yamijala, 2013-01-22, 04:29
Re: How to unit test mappers reading data from DistributedCache? - MapReduce - [mail # user]
...Hi,  Not sure how to do it using MRUnit, but should be possible to do this using a mocking framework like Mockito or EasyMock. In a mapper (or reducer), you'd use the Context classes to...
   Author: Hemanth Yamijala, 2013-01-18, 04:59
Re: tcp error - MapReduce - [mail # user]
...Coincidentally, I faced the same issue just now.  In my case, it turned out that I was running Hadoop daemons in pseudo-distributed mode, and in between a machine suspend and restart, t...
   Author: Hemanth Yamijala, 2013-01-17, 04:39
Re: Biggest cluster running YARN in the world? - MapReduce - [mail # user]
...You may get more updated information from folks at Yahoo!, but here is a mail on hadoop-general mailing list that has some statistics:  http://www.mail-archive.com/[EMAIL PROTECTED]/msg...
   Author: Hemanth Yamijala, 2013-01-15, 11:30
Re: Compile error using contrib.utils.join package with new mapreduce API - MapReduce - [mail # user]
...Hi,  No. I didn't find any reference to a working sample. I also didn't find any JIRA that asks for a migration of this package to the new API. Not sure why. I have asked on the dev lis...
   Author: Hemanth Yamijala, 2013-01-14, 14:15
Re: log server for hadoop MR jobs?? - MapReduce - [mail # user]
...To add to that, log aggregation is a feature available with Hadoop 2.0 (where mapreduce is re-written to YARN). The functionality is available via the History Server: http://hadoop.apache.or...
   Author: Hemanth Yamijala, 2013-01-14, 05:16
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