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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4645) Move from randomly generated block ID to sequentially generated block ID
Date Mon, 08 Jul 2013 05:27:49 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13701789#comment-13701789
] 

Tsz Wo (Nicholas), SZE commented on HDFS-4645:
----------------------------------------------

Checked TestOfflineEditsViewer with the new editsStored file manually.  It worked fine.
                
> 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
>         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, 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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