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Date: Mon, 22 Oct 2012 20:34:12 +0000 (UTC)
From: "Tsz Wo (Nicholas), SZE (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Assigned] (HDFS-4103) Support O(1) snapshot creation
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     [ https://issues.apache.org/jira/browse/HDFS-4103?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsz Wo (Nicholas), SZE reassigned HDFS-4103:
--------------------------------------------

    Assignee: Tsz Wo (Nicholas), SZE
    
> Support O(1) snapshot creation
> ------------------------------
>
>                 Key: HDFS-4103
>                 URL: https://issues.apache.org/jira/browse/HDFS-4103
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>
> In our first snapshot implementation, snapshot creation runs in O(N) and occupies O(N) memory space, where N = # files + # directories + # symlinks in the snapshot.  The advantages of the implementation are that there is no additional cost for the modifications after snapshots are created, and it leads to a simple implementation.
> In this JIRA, we optimize snapshot creation to O(1) although it introduces additional cost in the modifications after snapshots are created.

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