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[MAPREDUCE-1119] When tasks fail to report status, show tasks's stack dump before killing - MapReduce - [issue]
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...When the TT kills tasks that haven't reported status, it should somehow gather a stack dump for the task. This could be done either by sending a SIGQUIT (so the dump ends up in stdout) or pe...
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http://issues.apache.org/jira/browse/MAPREDUCE-1119
Author: Todd Lipcon,
2013-03-02, 18:10
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Re: [Vote] Merge branch-trunk-win to trunk - MapReduce - [mail # dev]
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...On Wed, Feb 27, 2013 at 2:54 PM, Suresh Srinivas wrote: I'm concerned about the above. Personally, I don't have access to any Windows boxes with development tools, and I know nothing a...
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Author: Todd Lipcon,
2013-02-27, 23:43
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Re: 答复: 答复: 答复: some ideas for QJM and NFS - MapReduce - [mail # user]
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...Yes, I agree with what Liang said. You can look at the sync time metrics on the JournalNodes and in the NameNode to determine whether this is indeed responsible for the throughput loss. &nbs...
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Author: Todd Lipcon,
2013-02-20, 00:04
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[MAPREDUCE-2980] Fetch failures and other related issues in Jetty 6.1.26 - MapReduce - [issue]
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...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...
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http://issues.apache.org/jira/browse/MAPREDUCE-2980
Author: Todd Lipcon,
2013-02-13, 05:09
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[MAPREDUCE-2374] "Text File Busy" errors launching MR tasks - MapReduce - [issue]
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...Some very small percentage of tasks fail with a "Text file busy" error.The following was the original diagnosis:Our use of PrintWriter in TaskController.writeCommand is unsafe, since that cl...
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http://issues.apache.org/jira/browse/MAPREDUCE-2374
Author: Todd Lipcon,
2013-02-07, 04:29
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[MAPREDUCE-4229] Counter names' memory usage can be decreased by interning - MapReduce - [issue]
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...In our experience, most of the memory in production JTs goes to storing counter names (String objects and character arrays). Since most counter names are reused again and again, it would be ...
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http://issues.apache.org/jira/browse/MAPREDUCE-4229
Author: Todd Lipcon,
2013-02-06, 17:05
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Re: HyperThreading in TaskTracker nodes? - MapReduce - [mail # user]
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...Power issues aside, I've seen similar sorts of performance gains for MR workloads - around 15-20%. I think a fair bit of it is due to poor CPU cache utilization in various parts of Had...
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Author: Todd Lipcon,
2013-02-05, 21:09
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Re: Release numbering for branch-2 releases - MapReduce - [mail # dev]
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...On Mon, Feb 4, 2013 at 2:14 PM, Suresh Srinivas wrote: My issue with the current scheme is that there is little definition as to what alpha/beta/stable means. We're trying to boil down...
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Author: Todd Lipcon,
2013-02-04, 22:36
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[MAPREDUCE-3267] MR2 reduce tasks showing >100% complete - MapReduce - [issue]
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...My job is currently showing >100% reduce completion. Some reduce tasks are much higher than 100% complete. they appear to be in the "last merge pass" stage...
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http://issues.apache.org/jira/browse/MAPREDUCE-3267
Author: Todd Lipcon,
2013-01-28, 23:03
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[MAPREDUCE-1347] Missing synchronization in MultipleOutputFormat - MapReduce - [issue]
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...MultipleOutputFormat's RecordWriter implementation doesn't use synchronization when accessing the recordWriters member. When using multithreaded mappers or reducers, this can result in probl...
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http://issues.apache.org/jira/browse/MAPREDUCE-1347
Author: Todd Lipcon,
2013-01-27, 17:46
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