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Re: Cannot use env variables in "hodrc" - MapReduce - [mail # user]
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...Hi, Hadoop On Demand is no longer supported with recent releases of Hadoop. There is no separate user list for HOD related questions. Which version of Hadoop are you using right ...
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Author: Hemanth Yamijala,
2013-02-08, 08:01
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Re: Filesystem closed exception - MapReduce - [mail # user]
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...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...
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Author: Hemanth Yamijala,
2013-01-31, 04:28
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Re: How to find Blacklisted Nodes via cli. - MapReduce - [mail # user]
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...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...
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Author: Hemanth Yamijala,
2013-01-31, 04:25
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Re: TT nodes distributed cache failure - MapReduce - [mail # user]
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...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...
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Author: Hemanth Yamijala,
2013-01-26, 07:25
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Re: mappers-node relationship - MapReduce - [mail # user]
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...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: ...
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Author: Hemanth Yamijala,
2013-01-26, 07:21
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Filesystem closed exception - MapReduce - [mail # user]
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...Hi, We are noticing a problem where we get a filesystem closed exception when a map task is done and is finishing execution. By map task, I literally mean the MapTask class of the map ...
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Author: Hemanth Yamijala,
2013-01-25, 01:26
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Re: passing arguments to hadoop job - MapReduce - [mail # user]
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...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:...
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Author: Hemanth Yamijala,
2013-01-22, 04:29
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Re: How to unit test mappers reading data from DistributedCache? - MapReduce - [mail # user]
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...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...
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Author: Hemanth Yamijala,
2013-01-18, 04:59
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Re: tcp error - MapReduce - [mail # user]
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...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...
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Author: Hemanth Yamijala,
2013-01-17, 04:39
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Re: tcp error - MapReduce - [mail # user]
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...At the place where you get the error, can you cross check what the URL is that is being accessed ? Also, can you compare it with the URL with pages before this that work ? Thanks heman...
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Author: Hemanth Yamijala,
2013-01-17, 04:18
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