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[MAPREDUCE-4229] Counter names' memory usage can be decreased by interning - MapReduce - [issue]
...In our experience, most of the memory in production JTs goes to storing counter names (String objects and character arrays). Since most counter names are reused again and again, it would be ...
http://issues.apache.org/jira/browse/MAPREDUCE-4229    Author: Todd Lipcon, 2014-09-04, 00:17
[MAPREDUCE-4884] streaming tests fail to start MiniMRCluster due to "Queue configuration missing child queue names for root" - MapReduce - [issue]
...Multiple tests in hadoop-streaming, such as TestFileArgs, fail to initialize MiniMRCluster due to a YarnException with reason "Queue configuration missing child queue names for root"....
http://issues.apache.org/jira/browse/MAPREDUCE-4884    Author: Chris Nauroth, 2014-09-04, 00:10
[MAPREDUCE-4736] Remove obsolete option [-rootDir] from TestDFSIO - MapReduce - [issue]
...Looks like this option is obsolete. Remove it to avoid confusion....
http://issues.apache.org/jira/browse/MAPREDUCE-4736    Author: Brandon Li, 2014-09-04, 00:10
[MAPREDUCE-5015] Coverage fix for org.apache.hadoop.mapreduce.tools.CLI - MapReduce - [issue]
...Coverage fix for org.apache.hadoop.mapreduce.tools.CLIMAPREDUCE-5015-trunk.patch patch for trunkMAPREDUCE-5015-branch-2.patch for branch-2MAPREDUCE-5015-branch-0.23.patch for branch-0.23...
http://issues.apache.org/jira/browse/MAPREDUCE-5015    Author: Aleksey Gorshkov, 2014-09-03, 23:59
[MAPREDUCE-5065] DistCp should skip checksum comparisons if block-sizes are different on source/target. - MapReduce - [issue]
...When copying files between 2 clusters with different default block-sizes, one sees that the copy fails with a checksum-mismatch, even though the files have identical contents.The reason is t...
http://issues.apache.org/jira/browse/MAPREDUCE-5065    Author: Mithun Radhakrishnan, 2014-09-03, 23:59
[MAPREDUCE-5147] Maven build should create hadoop-mapreduce-client-app-VERSION.jar directly - MapReduce - [issue]
...Currently the build creates mr-app.jar and links it to the proper name.  All hard links to mr-app.jar appear to have been removed.  The maven build should be simplified to directly...
http://issues.apache.org/jira/browse/MAPREDUCE-5147    Author: Robert Parker, 2014-09-03, 23:59
[MAPREDUCE-5043] Fetch failure processing can cause AM event queue to backup and eventually OOM - MapReduce - [issue]
...Saw an MRAppMaster with a 3G heap OOM.  Upon investigating another instance of it running, we saw the UI in a weird state where the task table and task attempt tables in the job overvie...
http://issues.apache.org/jira/browse/MAPREDUCE-5043    Author: Jason Lowe, 2014-09-03, 23:57
[MAPREDUCE-4794] DefaultSpeculator generates error messages on normal shutdown - MapReduce - [issue]
...DefaultSpeculator can log the following error message on a normal shutdown of the ApplicationMaster:2012-11-13 01:35:31,841 ERROR [DefaultSpeculator background processing] org.apache.hadoop....
http://issues.apache.org/jira/browse/MAPREDUCE-4794    Author: Jason Lowe, 2014-09-03, 23:57
[MAPREDUCE-4871] AM uses mapreduce.jobtracker.split.metainfo.maxsize but mapred-default has mapreduce.job.split.metainfo.maxsize - MapReduce - [issue]
...When the user needs to configure a larger split metainfo file size, mapred-default.xml points to the mapreduce.job.split.metainfo.maxsize property.  However the ApplicationMaster actual...
http://issues.apache.org/jira/browse/MAPREDUCE-4871    Author: Jason Lowe, 2014-09-03, 23:57
[MAPREDUCE-5009] Killing the Task Attempt slated for commit does not clear the value from the Task commitAttempt member - MapReduce - [issue]
...A reduce task attempt was killed by the RM(pre-emptively), but had already been assigned to the commitAttempt member.  This causes all subsequent attempts to be killed by the AM....
http://issues.apache.org/jira/browse/MAPREDUCE-5009    Author: Robert Parker, 2014-09-03, 23:57
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