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[MAPREDUCE-5962] Support CRC32C in IFile - MapReduce - [issue]
...Currently, the IFile format used by the MR shuffle checksums all data using the zlib CRC32 polynomial. If we allow use of CRC32C instead, we can get a large reduction in CPU usage by leverag...
http://issues.apache.org/jira/browse/MAPREDUCE-5962    Author: Todd Lipcon, 2014-07-18, 16:40
Making a branch for MR-2841 (native sort) - MapReduce - [mail # dev]
...Hi all,I'm planning to create a new branch for MAPREDUCE-2841, a nativeimplementation of the map output collector (aka mapside sort). There weresome concerns initially raised on the JIRA, bu...
   Author: Todd Lipcon, 2014-07-07, 16:29
[MAPREDUCE-2386] TT jetty server stuck in tight loop around epoll_wait - MapReduce - [issue]
...In some load testing, I got a TaskTracker into a state where its Jetty server is in a tight loop calling epoll_wait, which is returning EINVAL:[pid 19573] epoll_wait(157, 40829000, 8...
http://issues.apache.org/jira/browse/MAPREDUCE-2386    Author: Todd Lipcon, 2014-07-07, 10:39
[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-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
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
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