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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-4078) Handle replication in snapshots
Date Mon, 22 Oct 2012 00:14:12 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4078?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tsz Wo (Nicholas), SZE resolved HDFS-4078.
------------------------------------------

       Resolution: Fixed
    Fix Version/s: Snapshot (HDFS-2802)
     Hadoop Flags: Reviewed

Since trunk does not yet have snapshot, file replication and block replication are the same.
 Let's change trunk when we merge the branch.

I have commit this.
                
> Handle replication in snapshots
> -------------------------------
>
>                 Key: HDFS-4078
>                 URL: https://issues.apache.org/jira/browse/HDFS-4078
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>              Labels: needs-test
>             Fix For: Snapshot (HDFS-2802)
>
>         Attachments: h4078_20121021.patch
>
>
> Without snapshots, file replication is the same as block replication.
> With snapshot, the file replication R_o of the original file and the file replication
R_s of the snapshot file could possibly be different.  Since the blocks are shared between
the original file and the snapshot file, block replication is max(R_o, R_s).  If there are
more than one snapshots, block replication is the max file replication of the original file
and all snapshot files.

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