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[MAPREDUCE-5255] Reduce task preemption results in task never completing , incomplete fix to MAPREDUCE-3858 ?
...The problem was seen with symptoms very similar to MAPREDUCE-3858: the job is hung with continuous reduce task attempts, each attempt getting killed around commit phase.After a while the sin...
, 2015-05-27, 19:56
[MAPREDUCE-4443] MR AM and job history server should be resilient to jobs that exceed counter limits
...We saw this problem migrating applications to MapReduceV2:Our applications use hadoop counters extensively (1000+ counters for certain jobs). While this may not be one of recommended best pr...
, 2015-03-25, 01:49
[MAPREDUCE-4279] getClusterStatus() fails with null pointer exception when running jobs in local mode
...While migrating code from 0.20.2 hadoop codebase to 0.23.1 we encountered this issue for jobs run in local mode of execution:java.lang.NullPointerException at org.apache.hadoop.mapred.JobCli...
, 2014-09-04, 00:25
[MAPREDUCE-4428] A failed job is not available under job history if the job is killed right around the time job is notified as failed
...We have observed this issue consistently running hadoop CDH4 version (based upon 2.0 alpha release):In case our hadoop client code gets a notification for a completed job ( using RunningJob ...
, 2013-09-12, 05:41
[MAPREDUCE-4559] Job logs not accessible through job history server for AM killed due to am.liveness-monitor expiry
, 2013-09-12, 05:41
[MAPREDUCE-4560] Job can get stuck in a deadlock between mappers and reducers for low values of mapreduce.job.reduce.slowstart.completedmaps (<<1)
...This issue has been seen with MapReduceV2, never with MapReduceV1 in our lab systems.The parameter mapreduce.job.reduce.slowstart.completedmaps=0.05 (the default value).We found Application ...
, 2013-09-03, 07:41
[MAPREDUCE-4442] Accessing hadoop counters from a job is unreliable in yarn during AM process cleanup window
...We found this issue during our tests moving from MapReduceV1 to MapReduceV2. A few of our applications access job counters multiple times:a) After submission of job, while job is execution (...
, 2013-02-21, 02:05
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