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[MAPREDUCE-4733] Reducer can fail to make progress during shuffle if too many reducers complete consecutively - MapReduce - [issue]
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...TaskAttemptListenerImpl implements getMapCompletionEvents by calling Job.getTaskAttemptCompletionEvents with the same fromEvent and maxEvents passed in from the reducer and then filtering th...
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http://issues.apache.org/jira/browse/MAPREDUCE-4733
Author: Jason Lowe,
2013-02-06, 17:05
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[MAPREDUCE-4730] AM crashes due to OOM while serving up map task completion events - MapReduce - [issue]
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...We're seeing a repeatable OOM crash in the AM for a task with around 30000 maps and 3000 reducers. Details to follow....
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http://issues.apache.org/jira/browse/MAPREDUCE-4730
Author: Jason Lowe,
2013-02-06, 17:05
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[MAPREDUCE-4955] NM container diagnostics for excess resource usage can be lost if task fails while being killed - MapReduce - [issue]
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...When a nodemanager kills a container for being over resource budgets, it provides a diagnostics message for the container status explaining why it was killed. However this message can ...
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http://issues.apache.org/jira/browse/MAPREDUCE-4955
Author: Jason Lowe,
2013-02-06, 00:25
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[MAPREDUCE-4960] Unexpected extra results when using the task attempt table search - MapReduce - [issue]
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...When using the search box on the web UI to search for a specific task number (e.g.: "0831"), sometimes unexpected extra results are shown. Using the web browser's built-in search-withi...
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http://issues.apache.org/jira/browse/MAPREDUCE-4960
Author: Jason Lowe,
2013-01-28, 22:12
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[MAPREDUCE-4946] Type conversion of map completion events leads to performance problems with large jobs - MapReduce - [issue]
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...We've seen issues with large jobs (e.g.: 13,000 maps and 3,500 reduces) where reducers fail to connect back to the AM after being launched due to connection timeout. Looking at stack t...
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http://issues.apache.org/jira/browse/MAPREDUCE-4946
Author: Jason Lowe,
2013-01-23, 14:04
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[MAPREDUCE-4954] ShuffleHandler logs excessively when channel closed prematurely by reducer - MapReduce - [issue]
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...As initially reported in MAPREDUCE-4801, the shuffle protocol allows a reducer to hangup the connection to a nodemanager after receiving the shuffle header. This can introduce a connec...
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http://issues.apache.org/jira/browse/MAPREDUCE-4954
Author: Jason Lowe,
2013-01-22, 16:22
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[MAPREDUCE-4938] Job submission to unknown queue can leave staging directory behind - MapReduce - [issue]
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...There is a race where submitting a job to an unknown queue can appear to succeed to the client and then subsequently fail later. Since there was no AM ever launched, there was nothing ...
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http://issues.apache.org/jira/browse/MAPREDUCE-4938
Author: Jason Lowe,
2013-01-15, 14:35
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[MAPREDUCE-4810] Add admin command options for ApplicationMaster - MapReduce - [issue]
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...It would be nice if the MR ApplicationMaster had the notion of admin options in addition to the existing user options much like we have for map and reduce tasks, e.g.: mapreduce.admin.map.ch...
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http://issues.apache.org/jira/browse/MAPREDUCE-4810
Author: Jason Lowe,
2013-01-12, 12:35
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[MAPREDUCE-4819] AM can rerun job after reporting final job status to the client - MapReduce - [issue]
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...If the AM reports final job status to the client but then crashes before unregistering with the RM then the RM can run another AM attempt. Currently AM re-attempts assume that the prev...
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http://issues.apache.org/jira/browse/MAPREDUCE-4819
Author: Jason Lowe,
2013-01-04, 15:45
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[MAPREDUCE-4813] AM timing out during job commit - MapReduce - [issue]
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...The AM calls the output committer's commitJob method synchronously during JobImpl state transitions, which means the JobImpl write lock is held the entire time the job is being committed. &n...
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http://issues.apache.org/jira/browse/MAPREDUCE-4813
Author: Jason Lowe,
2012-12-29, 14:05
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