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[MAPREDUCE-5125] TestDFSIO should write less compressible data - MapReduce - [issue]
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...Currently, TestDFSIO writes a short repeating string of sequential (byte)0 through (byte)50. This makes its output very compressible (I measured 250:1 by LZOing the resulting file). This mak...
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http://issues.apache.org/jira/browse/MAPREDUCE-5125
Author: Todd Lipcon,
2013-05-14, 05:24
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[MAPREDUCE-1144] JT should not hold lock while writing user history logs to DFS - MapReduce - [issue]
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...I've seen behavior a few times now where the DFS is being slow for one reason or another, and the JT essentially locks up waiting on it while one thread tries for a long time to write histor...
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http://issues.apache.org/jira/browse/MAPREDUCE-1144
Author: Todd Lipcon,
2013-05-07, 20:04
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[MAPREDUCE-2289] Permissions race can make getStagingDir fail on local filesystem - MapReduce - [issue]
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...I've observed the following race condition in TestFairSchedulerSystem which uses a MiniMRCluster on top of RawLocalFileSystem: two threads call getStagingDir at the same time Thread A checks...
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http://issues.apache.org/jira/browse/MAPREDUCE-2289
Author: Todd Lipcon,
2013-05-06, 05:07
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[MAPREDUCE-3946] If a resource requirement is higher than available on any node, job should fail early - MapReduce - [issue]
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...If you configure the NMs to have 1GB of RAM each, and then try to submit a job which has an AM resource requirement of 1.5GB, the job will neither run nor fail. Instead, it will slowly sop o...
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http://issues.apache.org/jira/browse/MAPREDUCE-3946
Author: Todd Lipcon,
2013-05-04, 20:29
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[MAPREDUCE-3950] Configuration templates still MR1-centric - MapReduce - [issue]
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...The conf files in the dist tar's share/hadoop/common/templates/conf/ directory are very MR1-centric. For example, they set many JobTracker parameters, and there's no yarn-site included. the ...
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http://issues.apache.org/jira/browse/MAPREDUCE-3950
Author: Todd Lipcon,
2013-05-04, 00:25
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[MAPREDUCE-3949] If AM fails due to overrunning resource limits, error not visible through UI sometimes - MapReduce - [issue]
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...I had a case where an MR AM eclipsed the configured memory limit. This caused the AM's container to get killed, but nowhere accessible through the web UI showed these diagnostics. I had to g...
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http://issues.apache.org/jira/browse/MAPREDUCE-3949
Author: Todd Lipcon,
2013-04-09, 21:45
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[MAPREDUCE-2389] Spurious EOFExceptions reading SpillRecord index files - MapReduce - [issue]
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...In large jobs, I see around 1 shuffle fetch out of every million fetches fail with an EOFException reading the SpillRecord index file. After lots of investigation, including systemtap, it lo...
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http://issues.apache.org/jira/browse/MAPREDUCE-2389
Author: Todd Lipcon,
2013-04-04, 20:12
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[MAPREDUCE-3951] Tasks are not evenly spread throughout cluster in MR2 - MapReduce - [issue]
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...In MR1 (at least with the fair and fifo schedulers), if you submit a job that needs fewer resources than the cluster can provide, the tasks are spread relatively evenly across the node. For ...
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http://issues.apache.org/jira/browse/MAPREDUCE-3951
Author: Todd Lipcon,
2013-04-02, 23:10
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[MAPREDUCE-2760] mapreduce.jobtracker.split.metainfo.maxsize typoed in mapred-default.xml - MapReduce - [issue]
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...The configuration mapreduce.jobtracker.split.metainfo.maxsize is incorrectly included in mapred-default.xml as mapreduce.job.split.metainfo.maxsize. It seems that jobtracker is correct, sinc...
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http://issues.apache.org/jira/browse/MAPREDUCE-2760
Author: Todd Lipcon,
2013-03-26, 17:12
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[MAPREDUCE-1119] When tasks fail to report status, show tasks's stack dump before killing - MapReduce - [issue]
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...When the TT kills tasks that haven't reported status, it should somehow gather a stack dump for the task. This could be done either by sending a SIGQUIT (so the dump ends up in stdout) or pe...
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http://issues.apache.org/jira/browse/MAPREDUCE-1119
Author: Todd Lipcon,
2013-03-02, 18:10
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