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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5704) Change OP_UPDATE_BLOCKS with a new OP_ADD_BLOCK
Date Sat, 18 Jan 2014 13:28:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13875660#comment-13875660
] 

Hudson commented on HDFS-5704:
------------------------------

FAILURE: Integrated in Hadoop-Mapreduce-trunk #1673 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1673/])
Move HDFS-5704 and HDFS-5777 to the correct section in CHANGES.txt (jing9: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1559210)
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt


> Change OP_UPDATE_BLOCKS  with a new OP_ADD_BLOCK
> ------------------------------------------------
>
>                 Key: HDFS-5704
>                 URL: https://issues.apache.org/jira/browse/HDFS-5704
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>            Reporter: Suresh Srinivas
>            Assignee: Jing Zhao
>             Fix For: 3.0.0, 2.4.0
>
>         Attachments: HDFS-5704-branch2.patch, HDFS-5704.000.patch, HDFS-5704.001.patch,
HDFS-5704.002.patch, HDFS-5704.003.patch, editsStored, editsStored
>
>
> Currently every time a block a allocated, the entire list of blocks are written in the
editlog in OP_UPDATE_BLOCKS operation. This has n^2 growth issue. The total size of editlog
records for a file with large number of blocks could be huge.
> The goal of this jira is discuss adding a different editlog record that only records
allocation of block and not the entire block list, on every block allocation.



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