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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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[MAPREDUCE-4890] Invalid TaskImpl state transitions when task fails while speculating - MapReduce - [issue]
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...There are a couple of issues when a task fails while speculating (i.e.: multiple attempts are active): The other active attempts are not killed. TaskImpl's FAILED state does not handle the T...
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http://issues.apache.org/jira/browse/MAPREDUCE-4890
Author: Jason Lowe,
2012-12-22, 13:21
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[MAPREDUCE-4889] AM should have a diagnostics message for invalid state transitions - MapReduce - [issue]
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...When the ApplicationMaster encounters an invalid state transition in one of its many state machines (JobImpl, TaskImpl, TaskAttemptImpl, etc.) the job will fail with the ERROR state but the ...
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http://issues.apache.org/jira/browse/MAPREDUCE-4889
Author: Jason Lowe,
2012-12-19, 02:25
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[MAPREDUCE-4816] JobImpl Invalid event: JOB_TASK_ATTEMPT_COMPLETED at FAILED - MapReduce - [issue]
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...Saw this in an AM log of a task that had failed:2012-11-21 23:26:44,533 ERROR [AsyncDispatcher event handler] org.apache.hadoop.mapreduce.v2.app.job.impl.JobImpl: Can't handle this event at ...
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http://issues.apache.org/jira/browse/MAPREDUCE-4816
Author: Jason Lowe,
2012-12-11, 07:53
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[MAPREDUCE-4848] TaskAttemptContext cast error during AM recovery - MapReduce - [issue]
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...Recently saw an AM that failed and tried to recover, but the subsequent attempt quickly exited with its own failure during recovery:2012-12-05 02:33:36,752 FATAL [AsyncDispatcher event handl...
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http://issues.apache.org/jira/browse/MAPREDUCE-4848
Author: Jason Lowe,
2012-12-11, 05:35
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