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[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-5982] Task attempts that fail from the ASSIGNED state can disappear
...If a task attempt fails in the ASSIGNED state, e.g.: container launch fails, then it can disappear from the job history. The task overview page will show subsequent attempts but ...
, 2016-05-12, 14:24
[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
[MAPREDUCE-6472] MapReduce AM should have java.io.tmpdir=./tmp to be consistent with tasks
...MapReduceChildJVM.getVMCommand ensures that all tasks have -Djava.io.tmpdir=./tmp set as part of the task command-line, but this is only used for tasks. The AM itself does not have a c...
, 2016-01-26, 19:57
[MAPREDUCE-6230] MR AM does not survive RM restart if RM activated a new AMRM secret key
...A MapReduce AM will fail to reconnect to an RM that performed restart in the following scenario: MapReduce job launched with AMRM token generated from AMRM secret X RM rolls new AMRM secret ...
, 2016-01-14, 14:44
[MAPREDUCE-6324] Uber jobs fail to update AMRM token when it rolls over
...When the RM rolls a new AMRM master key the AMs are supposed to receive a new AMRM token on subsequent heartbeats between the time when the new key is rolled and when it is activated. ...
, 2016-01-14, 14:44
[MAPREDUCE-6021] MR AM should have working directory in LD_LIBRARY_PATH
...Tasks implicitly pick up shared libraries added to the job because the task launch context explicitly adds the container working directory to LD_LIBRARY_PATH. However the same is not d...
, 2015-12-24, 01:09
[MAPREDUCE-6355] 2.5 client cannot communicate with 2.5 job on 2.6 cluster
...Trying to run a job on a Hadoop 2.6 cluster from a Hadoop 2.5 client submitting a job that uses Hadoop 2.5 jars results in a job that succeeds but the client cannot communicate with the AM w...
, 2015-11-27, 17:51
[MAPREDUCE-5003] AM recovery should recreate records for attempts that were incomplete
...As discussed in MAPREDUCE-4992, it would be nice if the AM recovered task attempt entries for all task attempts launched by the prior app attempt even if those task attempts did not complete...
, 2015-11-02, 15:59
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