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[MAPREDUCE-4852] Reducer should not signal fetch failures for disk errors on the reducer's side - MapReduce - [issue]
...Ran across a case where a reducer ran on a node where the disks were full, leading to an exception like this during the shuffle fetch:2012-12-05 09:07:28,749 INFO [fetcher#25] org.apache.had...
http://issues.apache.org/jira/browse/MAPREDUCE-4852    Author: Jason Lowe, 2014-04-23, 20:03
[MAPREDUCE-5603] Ability to disable FileInputFormat listLocatedStatus optimization to save client memory - MapReduce - [issue]
...It would be nice if users had the option to disable the listLocatedStatus optimization in FileInputFormat to save client memory....
http://issues.apache.org/jira/browse/MAPREDUCE-5603    Author: Jason Lowe, 2014-04-22, 18:34
[MAPREDUCE-4283] Display tail of aggregated logs by default - MapReduce - [issue]
...Similar to the manner in which the nodemanager webUI displays container logs, it would be very useful if the historyserver showed the trailing 4K or so of the aggregated logs with a link to ...
http://issues.apache.org/jira/browse/MAPREDUCE-4283    Author: Jason Lowe, 2014-04-21, 19:17
[MAPREDUCE-4937] MR AM handles an oversized split metainfo file poorly - MapReduce - [issue]
...When an job runs with a split metainfo file that's larger than it has been configured to handle then it just crashes.  This leaves the user with a less-than-ideal debug session since th...
http://issues.apache.org/jira/browse/MAPREDUCE-4937    Author: Jason Lowe, 2014-04-20, 15:09
[MAPREDUCE-5570] Map task attempt with fetch failure has incorrect attempt finish time - MapReduce - [issue]
...If a map task attempt is retroactively failed due to excessive fetch failures reported by reducers then the attempt's finish time is set to the time the task was retroactively failed rather ...
http://issues.apache.org/jira/browse/MAPREDUCE-5570    Author: Jason Lowe, 2014-04-10, 14:11
[MAPREDUCE-5670] CombineFileRecordReader should report progress when moving to the next file - MapReduce - [issue]
...If a combine split consists of many "empty" files (i.e.: no record found by the underlying record reader) then theoretically a task can timeout due to lack of reported progress....
http://issues.apache.org/jira/browse/MAPREDUCE-5670    Author: Jason Lowe, 2014-04-10, 14:11
[MAPREDUCE-5778] JobSummary does not escape newlines in the job name - MapReduce - [issue]
...JobSummary is not escaping newlines in the job name.  This can result in a job summary log entry that spans multiple lines when users are expecting one-job-per-line output....
http://issues.apache.org/jira/browse/MAPREDUCE-5778    Author: Jason Lowe, 2014-04-10, 14:11
[MAPREDUCE-5757] ConcurrentModificationException in JobControl.toList - MapReduce - [issue]
...Despite having the fix for MAPREDUCE-5513 we saw another ConcurrencyModificationException in JobControl, so something there still isn't fixed....
http://issues.apache.org/jira/browse/MAPREDUCE-5757    Author: Jason Lowe, 2014-04-10, 14:11
[MAPREDUCE-4941] Use of org.apache.hadoop.mapred.lib.CombineFileRecordReader requires casting - MapReduce - [issue]
...Unlike its counterpart in org.apache.hadoop.mapreduce.lib.input, the CombineFileRecordReader in mapred requires a user to cast to a RecordReader since the constructor specification says it m...
http://issues.apache.org/jira/browse/MAPREDUCE-4941    Author: Jason Lowe, 2014-04-08, 15:33
[MAPREDUCE-5493] In-memory map outputs can be leaked after shuffle completes - MapReduce - [issue]
...MergeManagerImpl#close adds the contents of inMemoryMergedMapOutputs and inMemoryMapOutputs to a list of map outputs that is subsequently processed, but it does not clear those sets.  T...
http://issues.apache.org/jira/browse/MAPREDUCE-5493    Author: Jason Lowe, 2014-03-19, 18:42
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