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[MAPREDUCE-4946] Type conversion of map completion events leads to performance problems with large jobs - MapReduce - [issue]
...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...
http://issues.apache.org/jira/browse/MAPREDUCE-4946    Author: Jason Lowe, 2013-01-23, 14:04
[MAPREDUCE-4954] ShuffleHandler logs excessively when channel closed prematurely by reducer - MapReduce - [issue]
...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...
http://issues.apache.org/jira/browse/MAPREDUCE-4954    Author: Jason Lowe, 2013-01-22, 16:22
[MAPREDUCE-4938] Job submission to unknown queue can leave staging directory behind - MapReduce - [issue]
...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 ...
http://issues.apache.org/jira/browse/MAPREDUCE-4938    Author: Jason Lowe, 2013-01-15, 14:35
[MAPREDUCE-4810] Add admin command options for ApplicationMaster - MapReduce - [issue]
...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...
http://issues.apache.org/jira/browse/MAPREDUCE-4810    Author: Jason Lowe, 2013-01-12, 12:35
[MAPREDUCE-4890] Invalid TaskImpl state transitions when task fails while speculating - MapReduce - [issue]
...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...
http://issues.apache.org/jira/browse/MAPREDUCE-4890    Author: Jason Lowe, 2012-12-22, 13:21
[MAPREDUCE-4889] AM should have a diagnostics message for invalid state transitions - MapReduce - [issue]
...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 ...
http://issues.apache.org/jira/browse/MAPREDUCE-4889    Author: Jason Lowe, 2012-12-19, 02:25
[MAPREDUCE-4848] TaskAttemptContext cast error during AM recovery - MapReduce - [issue]
...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...
http://issues.apache.org/jira/browse/MAPREDUCE-4848    Author: Jason Lowe, 2012-12-11, 05:35
[MAPREDUCE-4835] AM job metrics can double-count a job if it errors after entering a completion state - MapReduce - [issue]
...If JobImpl enters the SUCCEEDED, FAILED, or KILLED state but then encounters an invalid state transition, it could double-count the job since jobs that encounter an error are considered fail...
http://issues.apache.org/jira/browse/MAPREDUCE-4835    Author: Jason Lowe, 2012-12-04, 00:47
[MAPREDUCE-4801] ShuffleHandler can generate large logs due to prematurely closed channels - MapReduce - [issue]
...We ran into an instance where many nodes on a cluster ran out of disk space because the nodemanager logs were huge.  Examining the logs showed many, many shuffle errors due to either Cl...
http://issues.apache.org/jira/browse/MAPREDUCE-4801    Author: Jason Lowe, 2012-11-16, 13:21
[MAPREDUCE-4785] TestMRApp occasionally fails - MapReduce - [issue]
...TestMRApp is failing occasionally with this error:testUpdatedNodes(org.apache.hadoop.mapreduce.v2.app.TestMRApp): Expecting 2 more completion events for killed expected:<4> but was:<...
http://issues.apache.org/jira/browse/MAPREDUCE-4785    Author: Jason Lowe, 2012-11-10, 23:58
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