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[MAPREDUCE-4279] getClusterStatus() fails with null pointer exception when running jobs in local mode - MapReduce - [issue]
...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...
http://issues.apache.org/jira/browse/MAPREDUCE-4279    Author: Rahul Jain, 2014-09-04, 00:25
[MAPREDUCE-4443] MR AM and job history server should be resilient to jobs that exceed counter limits - MapReduce - [issue]
...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...
http://issues.apache.org/jira/browse/MAPREDUCE-4443    Author: Rahul Jain, 2014-01-24, 18:03
Re: Identification of mapper slots - MapReduce - [mail # user]
...I assume you know the tradeoff here: If you do depend upon mapper slot # in your implementation to speed it up, you are losing on code portability in long term....  That said, one way t...
   Author: Rahul Jain, 2013-10-14, 23:25
[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 - MapReduce - [issue]
...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 ...
http://issues.apache.org/jira/browse/MAPREDUCE-4428    Author: Rahul Jain, 2013-09-12, 05:41
[MAPREDUCE-4559] Job logs not accessible through job history server for AM killed due to am.liveness-monitor expiry - MapReduce - [issue]
http://issues.apache.org/jira/browse/MAPREDUCE-4559    Author: Rahul Jain, 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) - MapReduce - [issue]
...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 ...
http://issues.apache.org/jira/browse/MAPREDUCE-4560    Author: Rahul Jain, 2013-09-03, 07:41
[MAPREDUCE-5255] Reduce task preemption  results in task never completing , incomplete fix to MAPREDUCE-3858 ? - MapReduce - [issue]
...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...
http://issues.apache.org/jira/browse/MAPREDUCE-5255    Author: Rahul Jain, 2013-05-18, 00:29
[MAPREDUCE-4442] Accessing hadoop counters from a job is unreliable in yarn during AM process cleanup  window - MapReduce - [issue]
...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 (...
http://issues.apache.org/jira/browse/MAPREDUCE-4442    Author: Rahul Jain, 2013-02-21, 02:05
Re: Time taken for launching Application Master - MapReduce - [mail # user]
...Check your node manager logs to understand the bottleneck first. When we had a similar issue on recent version of hadoop, which includes fix for MAPREDUCE-4068: we rearranged our job jar fil...
   Author: Rahul Jain, 2013-01-21, 07:44
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