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[MAPREDUCE-5042] Reducer unable to fetch for a map task that was recovered - MapReduce - [issue]
...If an application attempt fails and is relaunched the AM will try to recover previously completed tasks.  If a reducer needs to fetch the output of a map task attempt that was recovered...
http://issues.apache.org/jira/browse/MAPREDUCE-5042    Author: Jason Lowe, 2013-07-31, 03:02
[MAPREDUCE-5430] TestMRApps#testSetClasspathWithArchives is failing - MapReduce - [issue]
...TestMRApps#testSetClasspathWithArchives is failing, stacktrace to follow....
http://issues.apache.org/jira/browse/MAPREDUCE-5430    Author: Jason Lowe, 2013-07-30, 02:21
[MAPREDUCE-5266] Ability to refresh retention settings on history server - MapReduce - [issue]
...It would be very useful if the job and log retention settings of the history server could be refreshed without restarting the history server.  This would include such things as: how man...
http://issues.apache.org/jira/browse/MAPREDUCE-5266    Author: Jason Lowe, 2013-07-29, 23:49
[MAPREDUCE-5059] Job overview shows average merge time larger than for any reduce attempt - MapReduce - [issue]
...When looking at a job overview page on the history server, the Average Merge Time is often reported with a value that is far larger than the Elapsed Merge Time shown for any reduce task atte...
http://issues.apache.org/jira/browse/MAPREDUCE-5059    Author: Jason Lowe, 2013-07-29, 06:44
[MAPREDUCE-5417] Propagate task settings to AM when job runs in uber mode - MapReduce - [issue]
...When a job runs in Uber-AM mode the JVM settings (e.g.: heap sizing), container sizing, and environment variables are not propagated to the AM.  This means running in uber-AM mode is no...
http://issues.apache.org/jira/browse/MAPREDUCE-5417    Author: Jason Lowe, 2013-07-29, 06:10
[MAPREDUCE-4842] Shuffle race can hang reducer - MapReduce - [issue]
...Saw an instance where the shuffle caused multiple reducers in a job to hang.  It looked similar to the problem described in MAPREDUCE-3721, where the fetchers were all being told to WAI...
http://issues.apache.org/jira/browse/MAPREDUCE-4842    Author: Jason Lowe, 2013-07-26, 22:58
[MAPREDUCE-5124] AM lacks flow control for task events - MapReduce - [issue]
...The AM does not have any flow control to limit the incoming rate of events from tasks.  If the AM is unable to keep pace with the rate of incoming events for a sufficient period of time...
http://issues.apache.org/jira/browse/MAPREDUCE-5124    Author: Jason Lowe, 2013-07-19, 16:01
[MAPREDUCE-5211] Reducer intermediate files can collide during merge - MapReduce - [issue]
...The OnDiskMerger.merge method constructs an output path that is not unique to a reduce attempt, and as a result can result in a file collision with other reducers from the same app that are ...
http://issues.apache.org/jira/browse/MAPREDUCE-5211    Author: Jason Lowe, 2013-06-16, 13:25
[MAPREDUCE-4069] Cleanup task tokens interface - MapReduce - [issue]
...This tracks a couple of cleanup issues that were identified in MAPREDUCE-4043: It seems unnecessary to pass the job token and credentials separately when we always combine the job token into...
http://issues.apache.org/jira/browse/MAPREDUCE-4069    Author: Jason Lowe, 2013-06-13, 21:23
[MAPREDUCE-5307] Failure to launch a task attempt leads to missing failed attempt - MapReduce - [issue]
...When the AM tries to connect to a node to launch a task attempt but the launcher encounters an error (e.g.: RPC timeout, no connectivity to node, etc.), the error will count as a failed task...
http://issues.apache.org/jira/browse/MAPREDUCE-5307    Author: Jason Lowe, 2013-06-06, 17:20
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