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[MAPREDUCE-5997] native-task: Use DirectBufferPool from Hadoop Common - MapReduce - [issue]
...The native task code has its own direct buffer pool, but Hadoop already has an implementation. HADOOP-10882 will move that implementation into Common, and this JIRA is to remove the duplicat...
http://issues.apache.org/jira/browse/MAPREDUCE-5997    Author: Todd Lipcon, 2014-07-24, 09:20
[MAPREDUCE-5996] native-task: Rename system tests into standard directory layout - MapReduce - [issue]
...Currently there are a number of tests in src/java/system. This confuses IDEs which think that the package should then be system.org.apache.hadoop instead of just org.apache.hadoop....
http://issues.apache.org/jira/browse/MAPREDUCE-5996    Author: Todd Lipcon, 2014-07-24, 07:17
[MAPREDUCE-5994] native-task: TestBytesUtil fails - MapReduce - [issue]
...This class appears to have some bugs. Two tests fail consistently on my system. BytesUtil itself appears to duplicate a lot of code from guava - we should probably just use the Guava functio...
http://issues.apache.org/jira/browse/MAPREDUCE-5994    Author: Todd Lipcon, 2014-07-24, 07:14
[MAPREDUCE-5975] Fix native-task build on Ubuntu 13.10 - MapReduce - [issue]
...I'm having some issues building the native-task branch on my Ubuntu 13.10 box. This JIRA is to figure out and fix whatever's going on....
http://issues.apache.org/jira/browse/MAPREDUCE-5975    Author: Todd Lipcon, 2014-07-22, 21:09
[MAPREDUCE-496] If mapred.local.dir is configured on top of dfs.data.dir, hadoop should refuse to start rather than deleting the contents of local.dir - MapReduce - [issue]
...I just managed to blow away a DFS by accidentally misconfiguring dfs.data.dir and mapred.local.dir to contain several directories in common. On startup, the task tracker clears out mapred.lo...
http://issues.apache.org/jira/browse/MAPREDUCE-496    Author: Todd Lipcon, 2014-07-21, 18:04
[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
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