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Re: java.lang.OutOfMemoryError: GC overhead limit exceeded - Hadoop - [mail # user]
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...Have you tried lowering mapred.job.reuse.jvm.num.tasks ? On Sun, Sep 26, 2010 at 3:30 AM, Bradford Stephens wrote: ...
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Author: Ted Yu,
2010-09-26, 13:47
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Re: A new way to merge up those small files! - Hadoop - [mail # user]
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...Edward: Thanks for the tool. I think the last parameter can be omitted if you follow what hadoop fs -text does. It looks at a file's magic number so that it can attempt to *detect* the...
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Author: Ted Yu,
2010-09-25, 16:05
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Re: My mappers stop responding even though they reach 100% - Hadoop - [mail # user]
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...Does your mapper access external resources which may take some time to return ? On Thu, Sep 9, 2010 at 11:28 AM, Pavel Gutin wrote: ...
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Author: Ted Yu,
2010-09-10, 03:19
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Re: Sort with customized input/output !! - Hadoop - [mail # user]
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...Please get hadoop source code and read the comment at the beginning of SequenceFile.java: * Essentially there are 3 different formats for SequenceFiles ... On Tue, Sep 7, 2010 at...
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Author: Ted Yu,
2010-09-08, 03:59
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Re: Why does Generic Options Parser only take the first -D option? - Hadoop - [mail # user]
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...I checked GenericOptionsParser from 0.20.2 processGeneralOptions() should be able to process all -D options: if (line.hasOption('D')) { * String[] pro...
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Author: Ted Yu,
2010-09-02, 18:29
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Re: [DISCUSS] Hadoop Security Release off Yahoo! patchset - Hadoop - [mail # general]
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...This would imply hadoop-0.20-security-append or hadoop-0.20-append-security release be created which contains security and append features. On Thu, Aug 26, 2010 at 4:22 PM, Arun C Murt...
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Author: Ted Yu,
2010-08-26, 23:30
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Re: WARNING : There are about 1 missing blocks. Please check the log or run fsck. - Hadoop - [mail # general]
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...Run fsck. On Thu, Aug 26, 2010 at 5:56 AM, vaibhav negi wrote: ...
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Author: Ted Yu,
2010-08-26, 16:41
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Re: JIRA down - Hadoop - [mail # user]
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...In case you need to access JIRA tonight, google JIRA number and click on Cached link. You would see: http://webcache.googleusercontent.com/search?q=cache:Tgi71phHrUoJ:https://issues.ap...
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Author: Ted Yu,
2010-08-26, 03:59
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Re: data in compression format affect mapreduce speed - Hadoop - [mail # user]
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...Compressed data would increase processing time in mapper/reducer but decrease the amount of data transferred between tasktracker nodes. Normally you should consider applying some form of com...
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Author: Ted Yu,
2010-08-26, 03:43
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Re: Child processes on datanodes/task trackers - Hadoop - [mail # general]
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...I don't use ehcache. Did you forget to close CacheManager at the end of your job by any chance ? On Wed, Aug 25, 2010 at 7:59 PM, C J wrote: ...
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Author: Ted Yu,
2010-08-26, 03:39
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