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[MAPREDUCE-5883] "Total megabyte-seconds" in job counters is slightly misleading
...The following counters are in milliseconds so "megabyte-seconds" might be better stated as "megabyte-milliseconds"MB_MILLIS_MAPS.name= Total ...
, 2017-01-06, 07:39
[MAPREDUCE-6518] Set SO_KEEPALIVE on shuffle connections
...Shuffle handler does not set SO_KEEPALIVE so we've seen cases where FDs/sockets get stuck in ESTABLISHED state indefinitely because the server did not see the client leave (network cut or ot...
, 2017-01-06, 07:38
[MAPREDUCE-6474] ShuffleHandler can possibly exhaust nodemanager file descriptors
...The async nature of the shufflehandler can cause it to open a huge number offile descriptors, when it runs out it crashes.Scenario:Job with 6K reduces, slow start set to 0.95, about 40 map o...
, 2017-01-06, 07:31
[MAPREDUCE-6631] shuffle handler would benefit from per-local-dir threads
...Jason Lowe and I discussed this while investigating I/O starvation we have been seeing on our clusters lately (possibly amplified by increased tez workloads). If a particular disk is being s...
, 2016-07-21, 04:14
[MAPREDUCE-6678] Allow ShuffleHandler readahead without drop-behind
...Currently mapreduce.shuffle.manage.os.cache enables/disables both readahead (POSIX_FADV_WILLNEED) and drop-behind (POSIX_FADV_DONTNEED) logic within the ShuffleHandler.It would be beneficial...
, 2016-05-10, 16:51
[MAPREDUCE-3094] org.apache.hadoop.streaming.TestUlimit.testCommandLine fails intermittantly in 20.205.0
...11/09/24 00:22:10 INFO mapred.TaskInProgress: Error from attempt_20110924002157563_0001_m_000000_0: java.lang.RuntimeException: PipeMapRed.waitOutputThreads(): subprocess failed with code 13...
, 2015-03-20, 00:40
[MAPREDUCE-5569] FloatSplitter is not generating correct splits
...The closing split is not calculated correctly: // Catch any overage and create the closed interval for the last split. if (curLower <= maxVal || spli...
, 2014-09-04, 00:30
[MAPREDUCE-5846] Rumen doesn't understand JobQueueChangedEvent
...MAPREDUCE:5732 introduced a JobQueueChangeEvent to jhist files. Rumen fails to parse jhist files containing this event....
, 2014-09-03, 21:33
[MAPREDUCE-5308] Shuffling to memory can get out-of-sync when fetching multiple compressed map outputs
...When a reducer is fetching multiple compressed map outputs from a host, the fetcher can get out-of-sync with the IFileInputStream, causing several of the maps to fail to fetch.This occurs be...
, 2013-06-11, 15:07
[MAPREDUCE-4728] Interaction between oob heartbeats and damper can cause TT to heartbeat with zero delay
...When mapreduce.tasktracker.outofband.heartbeat is true and mapreduce.tasktracker.outofband.heartbeat.damper is something largish (like the default of 1000000), the TT doesn't wait for tasks ...
, 2013-02-20, 22:00
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