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Re: DFS Permissions on Hadoop 2.x - MapReduce - [mail # user]
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...Looks like the jobs fail only on the first attempt and pass thereafter. Failure occurs while setting perms on "intermediate done directory". Here is what I think is happening: 1. Inter...
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Author: Prashant Kommireddi,
2013-06-19, 00:48
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[MAPREDUCE-5330] JVM manager should not forcefully kill the process on Signal.TERM on Windows - MapReduce - [issue]
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...In MapReduce, we sometimes kill a task's JVM before it naturally shuts down if we want to launch other tasks (look in JvmManager$JvmManagerForType.reapJvm). This behavior means that if the m...
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http://issues.apache.org/jira/browse/MAPREDUCE-5330
Author: Xi Fang,
2013-06-19, 00:46
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[MAPREDUCE-5203] Make AM of M/R Use NMClient - MapReduce - [issue]
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...YARN-422 adds NMClient. AM of mapreduce should use it instead of using the raw ContainerManager proxy directly. ContainerLauncherImpl needs to be changed....
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http://issues.apache.org/jira/browse/MAPREDUCE-5203
Author: Zhijie Shen,
2013-06-18, 23:22
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[MAPREDUCE-5251] Reducer should not implicate map attempt if it has insufficient space to fetch map output - MapReduce - [issue]
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...A job can fail if a reducer happens to run on a node with insufficient space to hold a map attempt's output. The reducer keeps reporting the map attempt as bad, and if the map attempt ...
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http://issues.apache.org/jira/browse/MAPREDUCE-5251
Author: Jason Lowe,
2013-06-18, 22:35
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Re: DFS Permissions on Hadoop 2.x - MapReduce - [mail # user]
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...Hi Chris, This is while running a MR job. Please note the job is able to write files to "/mapred" directory and fails on EXECUTE permissions. On digging in some more, it looks like the...
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Author: Prashant Kommireddi,
2013-06-18, 22:24
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Re: Shuffle design: optimization tradeoffs - MapReduce - [mail # user]
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...On the academic side, you might be interested to read about *resilient distributed datasets (RDDs)* : http://www.cs.berkeley.edu/~matei/papers/2012/nsdi_spark.pdf. Not exactly the same subje...
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Author: Bertrand Dechoux,
2013-06-18, 22:04
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Re: Assignment of data splits to mappers - MapReduce - [mail # user]
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...1) The tradeoff is between reducing the overhead of distributed computing and reducing the cost of failure. Less tasks, less overhead but the cost of failure will be bigger, mainly because t...
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Author: Bertrand Dechoux,
2013-06-18, 21:54
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[MAPREDUCE-5221] Reduce side Combiner is not used when using the new API - MapReduce - [issue]
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...If a combiner is specified using o.a.h.mapreduce.Job.setCombinerClass - this will silently ignored on the reduce side since the reduce side usage is only aware of the old api combiner.This d...
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http://issues.apache.org/jira/browse/MAPREDUCE-5221
Author: Siddharth Seth,
2013-06-18, 21:39
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Re: Debugging YARN AM - MapReduce - [mail # user]
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...If distributed shell is running as an unmanaged AM then you should set the debug flags for the 'hadoop jar' invocation, doing an 'export HADOOP_OPTS=....' with the debug flags would do. &nbs...
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Author: Alejandro Abdelnur,
2013-06-18, 21:29
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[MAPREDUCE-5329] APPLICATION_INIT is never sent to AuxServices other than the builtin ShuffleHandler - MapReduce - [issue]
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...APPLICATION_INIT is never sent to AuxServices other than the built-in ShuffleHandler. This means that 3rd party ShuffleProvider(s) will not be able to function, because APPLICATION_INI...
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http://issues.apache.org/jira/browse/MAPREDUCE-5329
Author: Avner BenHanoch,
2013-06-18, 21:01
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