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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (HDFS-4645) Move from randomly generated block ID to sequentially generated block ID
Date Wed, 10 Jul 2013 21:01:49 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4645?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tsz Wo (Nicholas), SZE reopened HDFS-4645:
------------------------------------------

    
> 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: 3.0.0
>
>         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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