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Re: Thread safety issues with JNI/native code from map tasks? - Hadoop - [mail # user]
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...On Jan 28, 2011, at 13:37 , Greg Roelofs wrote: I suppose I hadn't specifically disabled that, but two points: (1) Speculative execution would occur on a completely different no...
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Author: Keith Wiley,
2011-01-28, 22:52
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Re: Java->native .so->seg fault->core dump file? - Hadoop - [mail # user]
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...On Jan 28, 2011, at 09:39 , Allen Wittenauer wrote: to the slave nodes): would need to have this in whatever account is used to run the tasktracker... True...good point. &n...
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Author: Keith Wiley,
2011-01-28, 21:15
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Thread safety issues with JNI/native code from map tasks? - Hadoop - [mail # user]
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...I am seeing very perplexing segfaults and standard allocation exceptions in my native code (.so files passed to the distributed cace) which is called via JNI from the map task. &...
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Author: Keith Wiley,
2011-01-28, 01:46
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Re: Hadoop Binary File - Hadoop - [mail # user]
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...On Jan 25, 2011, at 21:47 , F.Ozgur Catak wrote: wrote: Key which file know All Hmmm, "simple" you say...not even remotely. Our system has grown into quite the behemo...
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Author: Keith Wiley,
2011-01-28, 01:28
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Re: Hadoop Binary File - Hadoop - [mail # user]
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...I'm also doing binary image processing on Hadoop. Where relevant, my Key and Value types are a WritableComparable class of my own creation which contains as members a Bytes...
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Author: Keith Wiley,
2011-01-25, 20:13
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Re: Java->native .so->seg fault->core dump file? - Hadoop - [mail # user]
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...On Jan 21, 2011, at 16:47 , Greg Roelofs wrote: Hmmm, I wouldn't have expected task core dumps to have any dependence on HADOOP_HOME. I believe HADOOP_HOME is primar...
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Author: Keith Wiley,
2011-01-24, 18:05
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Java->native .so->seg fault->core dump file? - Hadoop - [mail # user]
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...My Java mappers use JNI to call native .so files compiled from C++. In some cases, the task status ends with exit 139, which generally indicates a seg-fault. I would ...
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Author: Keith Wiley,
2011-01-21, 20:57
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mapred.child.ulimit default value of null? - Hadoop - [mail # user]
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...What is the interpretation of a default value for mapred.child.ulimit of null? Does that mean children are completely unlimited in their permission to use memory? If ...
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Author: Keith Wiley,
2011-01-21, 18:02
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SkipBadRecords confusion - Hadoop - [mail # user]
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...Some of my inputs fail deterministically and I would like to avoid trying them four times. There seem to be two approachs, setMaxMapAttempts() and SkipBadRecords. I'm...
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Author: Keith Wiley,
2010-12-29, 18:09
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Re: conf.setMaxMapAttempts, SkipBadRecords, etc. - Hadoop - [mail # user]
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...Agreed, and thank you for the clarification. It almost sounds like this is a bug on the cluster side, like something I haven't done wrong in my own code or config files. &n...
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Author: Keith Wiley,
2010-12-25, 17:34
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