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[MAPREDUCE-3394] Add log guard for a debug message in ReduceTask - MapReduce - [issue]
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...There's a LOG.debug message in ReduceTask that stringifies a task ID and uses a non-negligible amount of CPU in some cases. We should guard it with isDebugEnabled...
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http://issues.apache.org/jira/browse/MAPREDUCE-3394
Author: Todd Lipcon,
2012-10-17, 19:27
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[MAPREDUCE-2103] task-controller shouldn't require o-r permissions - MapReduce - [issue]
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...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...
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http://issues.apache.org/jira/browse/MAPREDUCE-2103
Author: Todd Lipcon,
2012-10-17, 19:27
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[MAPREDUCE-1740] NPE in getMatchingLevelForNodes when node locations are variable depth - MapReduce - [issue]
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...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...
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http://issues.apache.org/jira/browse/MAPREDUCE-1740
Author: Todd Lipcon,
2012-10-17, 19:27
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[MAPREDUCE-3278] 0.20: avoid a busy-loop in ReduceTask scheduling - MapReduce - [issue]
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...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...
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http://issues.apache.org/jira/browse/MAPREDUCE-3278
Author: Todd Lipcon,
2012-10-17, 19:27
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[MAPREDUCE-2073] TestTrackerDistributedCacheManager should be up-front about requirements on build environment - MapReduce - [issue]
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...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...
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http://issues.apache.org/jira/browse/MAPREDUCE-2073
Author: Todd Lipcon,
2012-10-17, 19:27
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Re: Question about namenode HA - MapReduce - [mail # user]
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...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...
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Author: Todd Lipcon,
2012-10-16, 01:24
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[MAPREDUCE-2386] TT jetty server stuck in tight loop around epoll_wait - MapReduce - [issue]
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...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...
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http://issues.apache.org/jira/browse/MAPREDUCE-2386
Author: Todd Lipcon,
2012-10-04, 10:43
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[MAPREDUCE-3223] Remove MR1 configs from mapred-default.xml - MapReduce - [issue]
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...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...
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http://issues.apache.org/jira/browse/MAPREDUCE-3223
Author: Todd Lipcon,
2012-10-02, 14:20
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[MAPREDUCE-782] Use PureJavaCrc32 in mapreduce spills - MapReduce - [issue]
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...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...
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http://issues.apache.org/jira/browse/MAPREDUCE-782
Author: Todd Lipcon,
2012-09-25, 19:00
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[MAPREDUCE-3289] Make use of fadvise in the NM's shuffle handler - MapReduce - [issue]
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...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...
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http://issues.apache.org/jira/browse/MAPREDUCE-3289
Author: Todd Lipcon,
2012-09-25, 17:28
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