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[MAPREDUCE-4931] Add user-APIs for classpath precedence control - MapReduce - [issue]
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...The feature config from MAPREDUCE-1938 of allowing tasks to start with user-classes-first is fairly popular and can use its own API hooks in Job/JobConf classes, making it easier to discover...
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http://issues.apache.org/jira/browse/MAPREDUCE-4931
Author: Harsh J,
2013-05-28, 15:57
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Re: Mapreduce queues - MapReduce - [mail # user]
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...Can you rephrase your question to include definitions of what you mean by 'queues' and what you mean by 'clusters'? On Wed, May 22, 2013 at 7:22 PM, Pedro Sá da Costa wrote: &nbs...
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Author: Harsh J,
2013-05-27, 07:36
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Re: HTTP file server, map output, and other files - MapReduce - [mail # user]
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...YARN has a ShuffleHandler plugin used for MR purposes, but the APIs used here aren't "general"/public so you'd have to build your own utilities to do that. Its not too difficult to achieve b...
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Author: Harsh J,
2013-05-24, 06:43
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Re: Hadoop 2.0.4: Unable to load native-hadoop library for your platform - MapReduce - [mail # user]
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...The native libraries packed in a binary tarball of 2.0.4 may not apply to all OSes and architectures. You will need to build your own native libraries to make sure they are appropriate for y...
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Author: Harsh J,
2013-05-24, 06:24
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Re: pauses during startup (maybe network related?) - MapReduce - [mail # user]
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...You are spot on about the DNS lookup slowing things down. I've faced the same issue (before I had a local network DNS set up for the WiFi network I use). There's a few configs you nee...
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Author: Harsh J,
2013-05-24, 05:29
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Re: Task attempt failed after TaskAttemptListenerImpl ping - MapReduce - [mail # user]
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...Assuming you mean "failed" there instead of "filed". In MR, a ping message is sent over the TaskUmbilicalProtocol from the Task container to the MR AM. A ping is only sent as an altern...
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Author: Harsh J,
2013-05-24, 05:24
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Re: SequenceFile sync marker uniqueness - MapReduce - [mail # user]
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...SequenceFiles use a 16 digit MD5 (computed based on a UID and writer ~init time, so pretty random). For the rest of my answer, I'll prefer not to repeat what Martin's already said very well ...
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Author: Harsh J,
2013-05-23, 19:53
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Re: HDFS data and non-aligned splits - MapReduce - [mail # user]
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...on block boundaries? Answer depends on the file format used here. With any of the formats we ship, nothing happens. boundaries, resulting in an extra HDFS connection just to get ...
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Author: Harsh J,
2013-05-23, 19:09
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Re: Hadoop Rack awareness on virtual system - MapReduce - [mail # user]
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...An example topology file and script is available on the Wiki at http://wiki.apache.org/hadoop/topology_rack_awareness_scripts On Thu, May 23, 2013 at 8:38 PM, Jitendra Yadav wrote: &n...
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Author: Harsh J,
2013-05-23, 15:30
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Re: dncp_block_verification log - MapReduce - [mail # user]
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...Hi, What is your HDFS version? I vaguely remember this to be a problem in the 2.0.0 version or so where there was also a block scanner excessive work bug, but I'm not sure what fixed i...
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Author: Harsh J,
2013-05-23, 12:24
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