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What codes to chmod 755 to "yarn.nodemanager.log-dirs"? - Hadoop - [mail # user]
...Hi Experts,When the nodemanager log-dirs not exists, I thinkLocalDirsHandlerService#serviceInit will invokeDirectoryCollection#createDir to create the log dirs, and chmod 755 to it.However, ...
   Author: sam liu, 2014-04-24, 16:07
Re: Differences between HistoryServer and Yarn TimeLine server? - Hadoop - [mail # user]
...Zhijie,I am much clear now. Thanks a lot!As my understanding, besides previous Job History Server, hadoop now has anew timeline server which could restore both the generic YARN applicationhi...
   Author: sam liu, 2014-04-24, 03:16
Re: Why block sizes shown by 'fsck' and '-stat' are inconsistent? - Hadoop - [mail # user]
...Thanks for your comments!As I mentioned HDFS use only what it needs on the local file system. Forexample, a 16 KB hdfs file only use 16 KB local file system storage, not 64MB(its hdfs block ...
   Author: sam liu, 2014-04-05, 14:06
Re: How to submit the patch MAPREDUCE-4490.patch which works for branch-1.2, not trunk? - Hadoop - [mail # user]
...Hi Arpit,Thanks for your guide!  As a new contributor, I still have following twoquestions need your help:1) So I guess I should run 'test-patch.sh' on my local environment againstbranc...
   Author: sam liu, 2014-02-16, 08:54
Any method to get input splits by column? - Hadoop - [mail # user]
...Hi,  By default, MR inputformat classes break input file into splits by rows. However, we have a specilal requirement on MR app: get input splits by column.  Is there any good meth...
   Author: sam liu, 2013-12-23, 13:37
Re: How to set the handler count related parameters? - Hadoop - [mail # user]
...Thanks Nitin!  For dfs.namenode.handler.count, how many memory will be consumed for 1 thread?   2013/12/22 Nitin Pawar  ...
   Author: sam liu, 2013-12-22, 14:09
Re: hdfs unable to create new block with 'Too many open fiiles' exception - Hadoop - [mail # user]
...In this cluster, data nodes runs as user 'mapred'. Actually, all hadoop daemons runs as user 'mapred'.   2013/12/22 Ted Yu  ...
   Author: sam liu, 2013-12-21, 17:25
Re: Yarn never use TeraSort#TotalOrderPartitioner when run TeraSort job? - Hadoop - [mail # user]
...Furthermore, I did another test: rename TeraSort#TotalOrderPartitioner to TeraSort#MyOwnTotalOrderPartitioner to avoid conflicting with other homonymic classes in hadoop classpath. Also, in ...
   Author: sam liu, 2013-10-20, 13:26
Re: ArrayIndexOutOfBoundsException occurs from MapTask - Hadoop - [mail # user]
...Thanks for your information!  However, if so, it should be a Hadoop bug, because there is no restrictions on setting the value to "mapreduce.task.io.sort.mb"   2013/9/12 Brahma Red...
   Author: sam liu, 2013-09-12, 02:18
UnsupportedOperationException occurs with Hadoop-2.1.0-beta jar files - Hadoop - [mail # user]
...Hi,  With Hadoop-2.1.0-beta jar files, Sqoop-1.4.3 test TestAllTables failed by exception UnsupportedOperationException, however it works with Hadoop-2.0.4-alpha jar files. Below are th...
   Author: sam liu, 2013-09-09, 07:51
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