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[MAPREDUCE-4912] Investigate ways to clean up double job commit prevention - MapReduce - [issue]
...Once MAPREDUCE-4819 goes in it fixes the issue where an OutputCommiter can double commit a job.  So that the output will never be touched after the job informs externally of success or ...
http://issues.apache.org/jira/browse/MAPREDUCE-4912    Author: Robert Joseph Evans, 2013-01-04, 15:28
[MAPREDUCE-4832] MR AM can get in a split brain situation - MapReduce - [issue]
...It is possible for a networking issue to happen where the RM thinks an AM has gone down and launches a replacement, but the previous AM is still up and running.  If the previous AM does...
http://issues.apache.org/jira/browse/MAPREDUCE-4832    Author: Robert Joseph Evans, 2013-01-04, 09:15
[MAPREDUCE-2494] Make the distributed cache delete entires using LRU priority - MapReduce - [issue]
...Currently the distributed cache will wait until a cache directory is above a preconfigured threshold.  At which point it will delete all entries that are not currently being used.  ...
http://issues.apache.org/jira/browse/MAPREDUCE-2494    Author: Robert Joseph Evans, 2012-11-21, 11:07
[MAPREDUCE-4805] History files are not move to where the history server sees them - MapReduce - [issue]
...It looks like MAPREDUCE-4723 added in a default case to the JobHistoryEventHandler that is causing it to have lots of issues for events that should just be ignored....
http://issues.apache.org/jira/browse/MAPREDUCE-4805    Author: Robert Joseph Evans, 2012-11-19, 16:55
[MAPREDUCE-4480] T_ATTEMPT_KILLED after SUCCEEDED can happen for reduces too - MapReduce - [issue]
...This does not seem to impact 0.23.  If speculative execution is enabled then a T_ATTEMPT_KILLED event can come in after the task has transitioned to SUCCEEDED.  This causes the Map...
http://issues.apache.org/jira/browse/MAPREDUCE-4480    Author: Robert Joseph Evans, 2012-11-15, 16:05
[MAPREDUCE-4799] Task Attempts Page has tools open, not job - MapReduce - [issue]
...When you go the the task attempts page either on the running AM or the history server the "Tools" section on the left is open, when it should be the "Job" section....
http://issues.apache.org/jira/browse/MAPREDUCE-4799    Author: Robert Joseph Evans, 2012-11-14, 15:33
[MAPREDUCE-4772] Fetch failures can take way too long for a map to be restarted - MapReduce - [issue]
...In one particular case we saw a NM go down at just the right time, that most of the reducers got the output of the map tasks, but not all of them.The ones that failed to get the output repor...
http://issues.apache.org/jira/browse/MAPREDUCE-4772    Author: Robert Joseph Evans, 2012-11-09, 14:02
[MAPREDUCE-4760] Make a version of Counters that is composite for the job and stores the counter values in arrays - MapReduce - [issue]
...String interning reduced the size of counters a lot.  After that and the fix for a memory leak in the IPC server a job with 20000 map tasks and 3000 reducers takes about 200MB to store ...
http://issues.apache.org/jira/browse/MAPREDUCE-4760    Author: Robert Joseph Evans, 2012-10-31, 17:38
[MAPREDUCE-4303] Look at using String.intern to dedupe some Strings - MapReduce - [issue]
...MAPREDUCE-4301 fixes one issue with too many duplicate strings, but there are other places where it is not as simple to remove the duplicates.  In these cases the source of the strings ...
http://issues.apache.org/jira/browse/MAPREDUCE-4303    Author: Robert Joseph Evans, 2012-10-24, 15:03
[MAPREDUCE-4300] OOM in AM can turn it into a zombie. - MapReduce - [issue]
...It looks like 4 threads in the AM died with OOM but not the one pinging the RM.stderr for this AMWARNING: org.apache.hadoop.metrics.jvm.EventCounter is deprecated. Please use org.apache.hado...
http://issues.apache.org/jira/browse/MAPREDUCE-4300    Author: Robert Joseph Evans, 2012-10-11, 18:48
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB