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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-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
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB