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Re: Optimized Hadoop - MapReduce - [mail # dev]
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...On Thu, Feb 16, 2012 at 8:25 PM, Schubert Zhang wrote: right - that's a nice improvement, looking forward to getting that in trunk at some point. Looking at the code, it s...
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Author: Todd Lipcon,
2012-02-17, 18:07
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Re: Optimized Hadoop - MapReduce - [mail # dev]
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...Hey Schubert, Looking at the code on github, it looks like your rewritten shuffle is in fact just a backport of the shuffle from MR2. I didn't look closely - are there any distinguishi...
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Author: Todd Lipcon,
2012-02-16, 19:27
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[MAPREDUCE-2592] TT should fail task immediately if userlog dir cannot be created - MapReduce - [issue]
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...Currently, TaskRunner will log the message "mkdirs failed. Ignoring" if it fails to mkdir the userlog directory for a task. Then, it goes on to spawn taskjvm.sh which tries to redirect outpu...
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http://issues.apache.org/jira/browse/MAPREDUCE-2592
Author: Todd Lipcon,
2012-02-11, 17:51
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[MAPREDUCE-2301] TestDataDrivenDBInputFormat fails if port 9001 is occupied - MapReduce - [issue]
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...If you have any process listening on port 9001 (the default hsqldb port) then TestDataDrivenDBInputFormat will fail with:Connection is broken: java.io.EOFExceptionjava.sql.SQLException: Conn...
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http://issues.apache.org/jira/browse/MAPREDUCE-2301
Author: Todd Lipcon,
2012-01-30, 13:42
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[MAPREDUCE-3210] Support delay scheduling for node locality in MR2's capacity scheduler - MapReduce - [issue]
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...The capacity scheduler in MR2 doesn't support delay scheduling for achieving node-level locality. So, jobs exhibit poor data locality even if they have good rack locality. Especially on clus...
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http://issues.apache.org/jira/browse/MAPREDUCE-3210
Author: Todd Lipcon,
2012-01-03, 15:35
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[MAPREDUCE-3169] Create a new MiniMRCluster equivalent which only provides client APIs cross MR1 and MR2 - MapReduce - [issue]
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...Many dependent projects like HBase, Hive, Pig, etc, depend on MiniMRCluster for writing tests. Many users do as well. MiniMRCluster, however, exposes MR implementation details like the exist...
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http://issues.apache.org/jira/browse/MAPREDUCE-3169
Author: Todd Lipcon,
2011-12-28, 10:03
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Re: Performance of direct vs indirect shuffling - MapReduce - [mail # user]
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...The advantages of the "pull" based shuffle is fault tolerance - if you shuffle to the reducer and then the reducer dies, you have to rerun *all* of the earlier maps in the "push" model. &nbs...
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Author: Todd Lipcon,
2011-12-21, 00:53
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[MAPREDUCE-1481] Streaming should swallow IOExceptions when closing clientOut - MapReduce - [issue]
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...in PipeMapRed.mapRedFinished, streaming flushes and closes clientOut_, the handle to the subprocess's stdin. If the subprocess has already exited or closed its stdin, this will generate a Br...
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http://issues.apache.org/jira/browse/MAPREDUCE-1481
Author: Todd Lipcon,
2011-12-20, 14:21
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Re: Tasktracker Task Attempts Stuck (mapreduce.task.timeout not working) - MapReduce - [mail # user]
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...On Mon, Dec 19, 2011 at 7:29 PM, rajesh balamohan w rote: M Yep, this one that Rajesh mentions is a RHEL 6 bug: https://bugzilla.redhat.com/show_bug.cgi?id=750419 We can reproduc...
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Author: Todd Lipcon,
2011-12-20, 04:08
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[MAPREDUCE-2574] Force entropy to come from non-true random for tests - MapReduce - [issue]
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...Same as HADOOP-7335 but for MR...
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http://issues.apache.org/jira/browse/MAPREDUCE-2574
Author: Todd Lipcon,
2011-12-16, 12:26
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