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[MAPREDUCE-5002] AM could potentially allocate a reduce container to a map attempt
...As discussed in MAPREDUCE-4982, after MAPREDUCE-4893 it is theoretically possible for the AM to accidentally assign a reducer container to a map attempt if the AM doesn't find a reduce attem...
, 2015-09-17, 22:06
[MAPREDUCE-6303] Read timeout when retrying a fetch error can be fatal to a reducer
...If a reducer encounters an error trying to fetch from a node then encounters a read timeout when trying to re-establish the connection then the reducer can fail. The read timeout excep...
, 2015-09-02, 04:13
[MAPREDUCE-5513] ConcurrentModificationException in JobControl
...JobControl.toList is locking individual lists to iterate them, but those lists can be modified elsewhere without holding the list lock. The locking approaches are mismatched, with toLi...
, 2015-06-30, 08:18
[MAPREDUCE-5656] bzip2 codec can drop records when reading data in splits
...Bzip2Codec.BZip2CompressionInputStream can cause records to be dropped when reading them in splits based on where record delimiters occur relative to compression block boundaries.Thanks to K...
, 2015-06-12, 20:59
[MAPREDUCE-4376] TestClusterMRNotification times out
...The TestClusterMRNotification test is often timing out. git bisect tests narrowed it down to MAPREDUCE-3921, as the test consistently passes before that change and times out most of th...
, 2015-05-18, 18:42
[MAPREDUCE-4020] Web services returns incorrect JSON for deep queue tree
...When the capacity scheduler is configured for more than two levels of queues, the web services API returns incorrect JSON for the subQueues field of some parent queues. The "subQueues"...
, 2015-05-12, 09:18
[MAPREDUCE-6279] AM should explicity exit JVM after all services have stopped
...Occasionally the MapReduce AM can "get stuck" trying to shut down. MAPREDUCE-6049 and MAPREDUCE-5888 were specific instances that have been fixed, but this can also occur with uber job...
, 2015-05-08, 17:08
[MAPREDUCE-4818] Easier identification of tasks that timeout during localization
...When a task is taking too long to localize and is killed by the AM due to task timeout, the job UI/history is not very helpful. The attempt simply lists a diagnostic stating it was kil...
, 2015-05-02, 06:10
[MAPREDUCE-6141] History server leveldb recovery store
...It would be nice to have a leveldb option to the job history server recovery store. Leveldb would provide some benefits over the existing filesystem store such as better support for at...
, 2015-04-25, 00:15
[MAPREDUCE-6263] Configurable timeout between YARNRunner terminate the application and forcefully kill.
...YARNRunner connects to the AM to send the kill job command then waits a hardcoded 10 seconds for the job to enter a terminal state. If the job fails to enter a terminal state in that t...
, 2015-04-10, 21:19
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