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[MAPREDUCE-5251] Reducer should not implicate map attempt if it has insufficient space to fetch map output - MapReduce - [issue]
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...A job can fail if a reducer happens to run on a node with insufficient space to hold a map attempt's output. The reducer keeps reporting the map attempt as bad, and if the map attempt ...
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http://issues.apache.org/jira/browse/MAPREDUCE-5251
Author: Jason Lowe,
2013-05-15, 14:53
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[MAPREDUCE-5168] Reducer can OOM during shuffle because on-disk output stream not released - MapReduce - [issue]
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...If a reducer needs to shuffle a map output to disk, it opens an output stream and writes the data to disk. However it does not release the reference to the output stream within the Map...
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http://issues.apache.org/jira/browse/MAPREDUCE-5168
Author: Jason Lowe,
2013-05-14, 18:04
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[MAPREDUCE-5211] Reducer intermediate files can collide during merge - MapReduce - [issue]
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...The OnDiskMerger.merge method constructs an output path that is not unique to a reduce attempt, and as a result can result in a file collision with other reducers from the same app that are ...
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http://issues.apache.org/jira/browse/MAPREDUCE-5211
Author: Jason Lowe,
2013-05-13, 21:57
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Re: 2.0.4 beta vs 2.0.3 - MapReduce - [mail # dev]
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...This may be related to MAPREDUCE-5168 . There's a memory leak of sorts in the shuffle if many map outputs end up being merged from disk. Jason On 05/04/2013 06:...
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Author: Jason Lowe,
2013-05-06, 15:09
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Re: [VOTE] Release Apache Hadoop 2.0.4-alpha - MapReduce - [mail # dev]
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...+1 (binding) - verified signatures and checksums - installed single-node cluster from binaries and ran sample jobs - built and installed single-node cluster from source and ran sample ...
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Author: Jason Lowe,
2013-04-19, 22:43
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[MAPREDUCE-4941] Use of org.apache.hadoop.mapred.lib.CombineFileRecordReader requires casting - MapReduce - [issue]
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...Unlike its counterpart in org.apache.hadoop.mapreduce.lib.input, the CombineFileRecordReader in mapred requires a user to cast to a RecordReader since the constructor specification says it m...
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http://issues.apache.org/jira/browse/MAPREDUCE-4941
Author: Jason Lowe,
2013-04-15, 19:57
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[MAPREDUCE-5144] TestAMWebApp.testConfView has poor test coverage - MapReduce - [issue]
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...testConfView is supposed to test the rendering of a job's configuration page, but the rendering code exits early with, "Sorry, can't do anything without a JobID." Therefore it's not re...
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http://issues.apache.org/jira/browse/MAPREDUCE-5144
Author: Jason Lowe,
2013-04-11, 16:32
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[MAPREDUCE-5079] Recovery should restore task state from job history info directly - MapReduce - [issue]
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...We've encountered a lot of hanging issues during MR-AM recovery because the state machines don't always end up in the same states after recovery. This is especially true when speculati...
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http://issues.apache.org/jira/browse/MAPREDUCE-5079
Author: Jason Lowe,
2013-04-11, 15:04
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[MAPREDUCE-5043] Fetch failure processing can cause AM event queue to backup and eventually OOM - MapReduce - [issue]
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...Saw an MRAppMaster with a 3G heap OOM. Upon investigating another instance of it running, we saw the UI in a weird state where the task table and task attempt tables in the job overvie...
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http://issues.apache.org/jira/browse/MAPREDUCE-5043
Author: Jason Lowe,
2013-04-02, 15:31
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[MAPREDUCE-5002] AM could potentially allocate a reduce container to a map attempt - MapReduce - [issue]
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...As discussed in MAPREDUCE-4982, after MAPREDUCE-4893 it is theoretically possible for the AM to accidentally assign a reducer container to a map attempt if the AM doesn't find a reduce attem...
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http://issues.apache.org/jira/browse/MAPREDUCE-5002
Author: Jason Lowe,
2013-03-31, 22:40
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