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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4645) Move from randomly generated block ID to sequentially generated block ID
Date Thu, 11 Jul 2013 14:09:53 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13705850#comment-13705850
] 

Hudson commented on HDFS-4645:
------------------------------

Integrated in Hadoop-Mapreduce-trunk #1484 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1484/])
    In CHANGES.txt, move HDFS-4908 and HDFS-4645 to 2.1.0-beta. (Revision 1502009)

     Result = SUCCESS
szetszwo : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1502009
Files : 
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

                
> Move from randomly generated block ID to sequentially generated block ID
> ------------------------------------------------------------------------
>
>                 Key: HDFS-4645
>                 URL: https://issues.apache.org/jira/browse/HDFS-4645
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 3.0.0
>            Reporter: Suresh Srinivas
>            Assignee: Arpit Agarwal
>             Fix For: 2.1.0-beta
>
>         Attachments: editsStored, HDFS-4645.001.patch, HDFS-4645.002.patch, HDFS-4645.003.patch,
HDFS-4645.004.patch, HDFS-4645.005.patch, HDFS-4645.006.patch, HDFS-4645.branch-2.patch, SequentialblockIDallocation.pdf
>
>
> Currently block IDs are randomly generated. This means there is no pattern to block ID
generation and no guarantees such as uniqueness of block ID for the life time of the system
can be made. I propose using SequentialNumber for block ID generation.

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