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[MAPREDUCE-2103] task-controller shouldn't require o-r permissions - MapReduce - [issue]
...The task-controller currently checks that "other" users don't have read permissions. This is unnecessary - we just need to make it's not executable. The debian policy manual explains it well...
http://issues.apache.org/jira/browse/MAPREDUCE-2103    Author: Todd Lipcon, 2012-10-17, 19:27
[MAPREDUCE-1740] NPE in getMatchingLevelForNodes when node locations are variable depth - MapReduce - [issue]
...In getMatchingLevelForNodes, we assume that both nodes have the same "depth" (ie number of path components). If the user provides a topology script that assigns one node a path like /foo/bar...
http://issues.apache.org/jira/browse/MAPREDUCE-1740    Author: Todd Lipcon, 2012-10-17, 19:27
[MAPREDUCE-3278] 0.20: avoid a busy-loop in ReduceTask scheduling - MapReduce - [issue]
...Looking at profiling results, it became clear that the ReduceTask has the following busy-loop which was causing it to suck up 100% of CPU in the fetch phase in some configurations: the numbe...
http://issues.apache.org/jira/browse/MAPREDUCE-3278    Author: Todd Lipcon, 2012-10-17, 19:27
[MAPREDUCE-2073] TestTrackerDistributedCacheManager should be up-front about requirements on build environment - MapReduce - [issue]
...TestTrackerDistributedCacheManager will fail on a system where the build directory is in any path where an ancestor doesn't have a+x permissions. On one of our hudson boxes, for example, hud...
http://issues.apache.org/jira/browse/MAPREDUCE-2073    Author: Todd Lipcon, 2012-10-17, 19:27
Re: Question about namenode HA - MapReduce - [mail # user]
...Hi Liang,  Answers inline below.  On Sun, Oct 14, 2012 at 8:01 PM, 谢良  w rote:  There are a few reasons for this design choice:  1)  Like Steve said, it's easie...
   Author: Todd Lipcon, 2012-10-16, 01:24
[MAPREDUCE-782] Use PureJavaCrc32 in mapreduce spills - MapReduce - [issue]
...HADOOP-6148 implemented a Pure Java implementation of CRC32 which performs better than the built-in one. This issue is to make use of it in the mapred package...
http://issues.apache.org/jira/browse/MAPREDUCE-782    Author: Todd Lipcon, 2012-09-25, 19:00
[MAPREDUCE-3289] Make use of fadvise in the NM's shuffle handler - MapReduce - [issue]
...Using the new NativeIO fadvise functions, we can make the NodeManager prefetch map output before it's send over the socket, and drop it out of the fs cache once it's been sent (since it's ve...
http://issues.apache.org/jira/browse/MAPREDUCE-3289    Author: Todd Lipcon, 2012-09-25, 17:28
[MAPREDUCE-2704] CombineFileInputFormat only works when paths are on the default filesystem - MapReduce - [issue]
...CombineFileInputFormat constructs new Path objects by converting an existing path to a URI, and then only pulling out the "path" part of it. This drops the scheme and host, which makes Combi...
http://issues.apache.org/jira/browse/MAPREDUCE-2704    Author: Todd Lipcon, 2012-09-19, 20:28
Re: HDFS dfs.client.read.shortcircuit.skip.checksum - MapReduce - [mail # user]
...Hi LiuLei,  Since you're using CDH3 (a 1.x derived distribution) you are using the old checksum implementations written in Java.  In Hadoop 2.0 (or CDH4), we have JNI-based checksu...
   Author: Todd Lipcon, 2012-09-17, 21:36
[MAPREDUCE-3993] Graceful handling of codec errors during decompression - MapReduce - [issue]
...When using a compression codec for intermediate compression, some cases of corrupt data can cause the codec to throw exceptions other than IOException (eg java.lang.InternalError). This will...
http://issues.apache.org/jira/browse/MAPREDUCE-3993    Author: Todd Lipcon, 2012-09-07, 22:10
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