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[MAPREDUCE-3191] docs for map output compression incorrectly reference SequenceFile - MapReduce - [issue]
...The documentation currently says that map output compression uses SequenceFile compression. This hasn't been true in several years, since we use IFile for intermediate data now....
http://issues.apache.org/jira/browse/MAPREDUCE-3191    Author: Todd Lipcon, 2014-06-30, 09:18
[MAPREDUCE-5821] IFile merge allocates new byte array for every value - MapReduce - [issue]
...I wrote a standalone benchmark of the MapOutputBuffer and found that it did a lot of allocations during the merge phase. After looking at an allocation profile, I found that IFile.Reader.nex...
http://issues.apache.org/jira/browse/MAPREDUCE-5821    Author: Todd Lipcon, 2014-06-30, 09:18
[MAPREDUCE-3184] Improve handling of fetch failures when a tasktracker is not responding on HTTP - MapReduce - [issue]
...On a 100 node cluster, we had an issue where one of the TaskTrackers was hit by MAPREDUCE-2386 and stopped responding to fetches. The behavior observed was the following: every reducer would...
http://issues.apache.org/jira/browse/MAPREDUCE-3184    Author: Todd Lipcon, 2014-03-11, 17:34
[MAPREDUCE-3223] Remove MR1 configs from mapred-default.xml - MapReduce - [issue]
...All of the MRv1 configs are still in mapred-default.xml. This is confusing when trying to make config changes. Since a lot of the input/output format tests still depend on MR1, I'd like to m...
http://issues.apache.org/jira/browse/MAPREDUCE-3223    Author: Todd Lipcon, 2014-02-21, 23:16
Re: Next releases - MapReduce - [mail # dev]
...On Mon, Nov 11, 2013 at 2:57 PM, Colin McCabe wrote:   I agree with Colin. If we've been backporting things into a patch release (third version component) which don't belong, we should ...
   Author: Todd Lipcon, 2013-11-12, 19:54
[MAPREDUCE-5125] TestDFSIO should write less compressible data - MapReduce - [issue]
...Currently, TestDFSIO writes a short repeating string of sequential (byte)0 through (byte)50. This makes its output very compressible (I measured 250:1 by LZOing the resulting file). This mak...
http://issues.apache.org/jira/browse/MAPREDUCE-5125    Author: Todd Lipcon, 2013-09-09, 06:28
[MAPREDUCE-3235] Improve CPU cache behavior in map side sort - MapReduce - [issue]
...When running oprofile on a terasort workload, I noticed that a large amount of CPU usage was going to MapTask$MapOutputBuffer.compare. Upon disassembling this and looking at cycle counters, ...
http://issues.apache.org/jira/browse/MAPREDUCE-3235    Author: Todd Lipcon, 2013-08-15, 19:47
[MAPREDUCE-3992] Reduce fetcher doesn't verify HTTP status code of response - MapReduce - [issue]
...Currently, the reduce fetch code doesn't check the HTTP status code of the response. This can lead to the following situation: the map output servlet gets an IOException after setting the he...
http://issues.apache.org/jira/browse/MAPREDUCE-3992    Author: Todd Lipcon, 2013-08-01, 12:38
Re: Recovering the namenode from failure - MapReduce - [mail # user]
...Hi David,  You shouldn't need to do anything to get your DNs to report in -- as best they can tell, it's the same NN. Do you see any error messages in the DN logs?  -Todd  On ...
   Author: Todd Lipcon, 2013-05-21, 16:23
[MAPREDUCE-2289] Permissions race can make getStagingDir fail on local filesystem - MapReduce - [issue]
...I've observed the following race condition in TestFairSchedulerSystem which uses a MiniMRCluster on top of RawLocalFileSystem: two threads call getStagingDir at the same time Thread A checks...
http://issues.apache.org/jira/browse/MAPREDUCE-2289    Author: Todd Lipcon, 2013-05-06, 05:07
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