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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4125) Use a persistent data structure for snapshots
Date Thu, 15 Nov 2012 23:33:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13498441#comment-13498441
] 

Aaron T. Myers commented on HDFS-4125:
--------------------------------------

Is this JIRA not a duplicate of HDFS-4103? They seem to be aiming to do the same thing.
                
> Use a persistent data structure for snapshots
> ---------------------------------------------
>
>                 Key: HDFS-4125
>                 URL: https://issues.apache.org/jira/browse/HDFS-4125
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: h4125_20121114b.patch, h4125_20121114.patch
>
>
> There is a well-known data structure supporting
> - O(1) snapshot creation,
> - O(1) access slowdown, and
> - O(1) modification space and time.
> See http://www.cs.cmu.edu/~sleator/papers/Persistence.htm

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