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Re: java.lang.OutOfMemoryError: GC overhead limit exceeded - Hadoop - [mail # user]
...-1 means there is no limit to reusing. At the same time, you can generate heap dump from OOME and analyze with YourKit, etc.  Cheers  On Sun, Sep 26, 2010 at 1:19 PM, Bradford Step...
   Author: Ted Yu, 2010-09-26, 21:35
Re: A new way to merge up those small files! - Hadoop - [mail # user]
...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...
   Author: Ted Yu, 2010-09-25, 16:05
Re: My mappers stop responding even though they reach 100% - Hadoop - [mail # user]
...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:  ...
   Author: Ted Yu, 2010-09-10, 03:19
Re: Sort with customized input/output !! - Hadoop - [mail # user]
...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...
   Author: Ted Yu, 2010-09-08, 03:59
Re: Why does Generic Options Parser only take the first -D option? - Hadoop - [mail # user]
...I checked GenericOptionsParser from 0.20.2 processGeneralOptions() should be able to process all -D options:      if (line.hasOption('D')) { *      String[] pro...
   Author: Ted Yu, 2010-09-02, 18:29
Re: [DISCUSS] Hadoop Security Release off Yahoo! patchset - Hadoop - [mail # general]
...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...
   Author: Ted Yu, 2010-08-26, 23:30
Re: WARNING : There are about 1 missing blocks. Please check the log or run fsck. - Hadoop - [mail # general]
...Run fsck.  On Thu, Aug 26, 2010 at 5:56 AM, vaibhav negi wrote:  ...
   Author: Ted Yu, 2010-08-26, 16:41
Re: JIRA down - Hadoop - [mail # user]
...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...
   Author: Ted Yu, 2010-08-26, 03:59
Re: data in compression format affect mapreduce speed - Hadoop - [mail # user]
...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...
   Author: Ted Yu, 2010-08-26, 03:43
Re: Child processes on datanodes/task trackers - Hadoop - [mail # general]
...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:  ...
   Author: Ted Yu, 2010-08-26, 03:39
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