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[MAPREDUCE-3949] If AM fails due to overrunning resource limits, error not visible through UI sometimes - MapReduce - [issue]
...I had a case where an MR AM eclipsed the configured memory limit. This caused the AM's container to get killed, but nowhere accessible through the web UI showed these diagnostics. I had to g...
http://issues.apache.org/jira/browse/MAPREDUCE-3949    Author: Todd Lipcon, 2013-04-09, 21:45
[MAPREDUCE-2389] Spurious EOFExceptions reading SpillRecord index files - MapReduce - [issue]
...In large jobs, I see around 1 shuffle fetch out of every million fetches fail with an EOFException reading the SpillRecord index file. After lots of investigation, including systemtap, it lo...
http://issues.apache.org/jira/browse/MAPREDUCE-2389    Author: Todd Lipcon, 2013-04-04, 20:12
[MAPREDUCE-3951] Tasks are not evenly spread throughout cluster in MR2 - MapReduce - [issue]
...In MR1 (at least with the fair and fifo schedulers), if you submit a job that needs fewer resources than the cluster can provide, the tasks are spread relatively evenly across the node. For ...
http://issues.apache.org/jira/browse/MAPREDUCE-3951    Author: Todd Lipcon, 2013-04-02, 23:10
[MAPREDUCE-2760] mapreduce.jobtracker.split.metainfo.maxsize typoed in mapred-default.xml - MapReduce - [issue]
...The configuration mapreduce.jobtracker.split.metainfo.maxsize is incorrectly included in mapred-default.xml as mapreduce.job.split.metainfo.maxsize. It seems that jobtracker is correct, sinc...
http://issues.apache.org/jira/browse/MAPREDUCE-2760    Author: Todd Lipcon, 2013-03-26, 17:12
[MAPREDUCE-1119] When tasks fail to report status, show tasks's stack dump before killing - MapReduce - [issue]
...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...
http://issues.apache.org/jira/browse/MAPREDUCE-1119    Author: Todd Lipcon, 2013-03-02, 18:10
Re: [Vote] Merge branch-trunk-win to trunk - MapReduce - [mail # dev]
...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...
   Author: Todd Lipcon, 2013-02-27, 23:43
Re: 答复: 答复: 答复: some ideas for QJM and NFS - MapReduce - [mail # user]
...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...
   Author: Todd Lipcon, 2013-02-20, 00:04
[MAPREDUCE-2374] "Text File Busy" errors launching MR tasks - MapReduce - [issue]
...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...
http://issues.apache.org/jira/browse/MAPREDUCE-2374    Author: Todd Lipcon, 2013-02-07, 04:29
[MAPREDUCE-4229] Counter names' memory usage can be decreased by interning - MapReduce - [issue]
...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 ...
http://issues.apache.org/jira/browse/MAPREDUCE-4229    Author: Todd Lipcon, 2013-02-06, 17:05
Re: HyperThreading in TaskTracker nodes? - MapReduce - [mail # user]
...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...
   Author: Todd Lipcon, 2013-02-05, 21:09
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