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