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[MAPREDUCE-4741] WARN and ERROR messages logged during normal AM shutdown - MapReduce - [issue]
...The ApplicationMaster is logging WARN and ERROR messages during normal shutdown, and some users are misinterpreting these as serious problems.  For example:2012-10-02 13:58:50,247 ERROR...
http://issues.apache.org/jira/browse/MAPREDUCE-4741    Author: Jason Lowe, 2013-02-06, 17:05
[MAPREDUCE-4733] Reducer can fail to make progress during shuffle if too many reducers complete consecutively - MapReduce - [issue]
...TaskAttemptListenerImpl implements getMapCompletionEvents by calling Job.getTaskAttemptCompletionEvents with the same fromEvent and maxEvents passed in from the reducer and then filtering th...
http://issues.apache.org/jira/browse/MAPREDUCE-4733    Author: Jason Lowe, 2013-02-06, 17:05
[MAPREDUCE-4730] AM crashes due to OOM while serving up map task completion events - MapReduce - [issue]
...We're seeing a repeatable OOM crash in the AM for a task with around 30000 maps and 3000 reducers.  Details to follow....
http://issues.apache.org/jira/browse/MAPREDUCE-4730    Author: Jason Lowe, 2013-02-06, 17:05
[MAPREDUCE-4960] Unexpected extra results when using the task attempt table search - MapReduce - [issue]
...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...
http://issues.apache.org/jira/browse/MAPREDUCE-4960    Author: Jason Lowe, 2013-01-28, 22:12
[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-4813] AM timing out during job commit - MapReduce - [issue]
...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...
http://issues.apache.org/jira/browse/MAPREDUCE-4813    Author: Jason Lowe, 2012-12-29, 14:05
[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
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