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[MAPREDUCE-6763] Shuffle server listen queue is too small
...ShuffleHandler doesn't specify a listen queue length for the server port, so it ends up getting the default listen queue length of 50. This is too small to handle bursts of shuffle tra...
, 2016-08-30, 01:12
[MAPREDUCE-4955] NM container diagnostics for excess resource usage can be lost if task fails while being killed
...When a nodemanager kills a container for being over resource budgets, it provides a diagnostics message for the container status explaining why it was killed. However this message can ...
, 2016-08-29, 18:28
[MAPREDUCE-6413] TestLocalJobSubmission is failing with unknown host
...ThestLocalJobSubmission.testLocalJobLibjarsOption is failing with java.net.UnknownHostException: testcluster...
, 2016-08-25, 22:55
[MAPREDUCE-5124] AM lacks flow control for task events
...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...
, 2016-07-22, 22:28
[MAPREDUCE-6625] TestCLI#testGetJob fails occasionally
...Lately TestCLI has been failing sometimes in precommit builds:Running org.apache.hadoop.mapreduce.tools.TestCLITests run: 4, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 0.883 sec <&...
, 2016-07-12, 23:33
[MAPREDUCE-6697] Concurrent task limits should only be applied when necessary
...The concurrent task limit feature should only adjust the ANY portion of the AM heartbeat ask when a limit is truly necessary, otherwise extraneous containers could be allocated by the RM to ...
, 2016-06-14, 17:00
[MAPREDUCE-4842] Shuffle race can hang reducer
...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...
, 2016-06-08, 20:21
[MAPREDUCE-5583] Ability to limit running map and reduce tasks
...It would be nice if users could specify a limit to the number of map or reduce tasks that are running simultaneously. Occasionally users are performing operations in tasks that can lea...
, 2016-05-16, 19:54
[MAPREDUCE-4815] Speed up FileOutputCommitter#commitJob for many output files
...If a job generates many files to commit then the commitJob method call at the end of the job can take minutes. This is a performance regression from 1.x, as 1.x had the tasks commit di...
, 2016-04-19, 16:48
[MAPREDUCE-6491] Environment variable handling assumes values should be appended
...When processing environment variables for a container context the code assumes that the value should be appended to any pre-existing value in the environment. This may be desired behav...
, 2016-03-11, 18:58
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