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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, 2014-04-17, 12:09
[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, 2014-04-12, 22:21
[MAPREDUCE-2980] Fetch failures and other related issues in Jetty 6.1.26 - MapReduce - [issue]
...Since upgrading Jetty from 6.1.14 to 6.1.26 we've had a ton of HTTP-related issues, including: Much higher incidence of fetch failures A few strange file-descriptor related bugs (eg MAPREDUC...
http://issues.apache.org/jira/browse/MAPREDUCE-2980    Author: Todd Lipcon, 2014-04-03, 11:17
[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
[MAPREDUCE-1144] JT should not hold lock while writing user history logs to DFS - MapReduce - [issue]
...I've seen behavior a few times now where the DFS is being slow for one reason or another, and the JT essentially locks up waiting on it while one thread tries for a long time to write histor...
http://issues.apache.org/jira/browse/MAPREDUCE-1144    Author: Todd Lipcon, 2014-01-10, 01:44
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-1347] Missing synchronization in MultipleOutputFormat - MapReduce - [issue]
...MultipleOutputFormat's RecordWriter implementation doesn't use synchronization when accessing the recordWriters member. When using multithreaded mappers or reducers, this can result in probl...
http://issues.apache.org/jira/browse/MAPREDUCE-1347    Author: Todd Lipcon, 2013-09-29, 14:00
[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
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