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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4125) Use a persistent data structure for snapshots
Date Wed, 31 Oct 2012 02:01:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13487450#comment-13487450
] 

Suresh Srinivas commented on HDFS-4125:
---------------------------------------

Todd, please look at the latest design document in HDFS-2802 to understand the cost of modification.
                
> 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: Suresh Srinivas
>
> 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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