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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1143) Implement Background deletion
Date Sun, 12 Sep 2010 07:20:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12908420#action_12908420

dhruba borthakur commented on HDFS-1143:

+1 code looks good. Please upload a new patch merged with latest trunk and rerun hudson tests
manually. Once this is done, I will commit it.

> Implement Background deletion
> -----------------------------
>                 Key: HDFS-1143
>                 URL: https://issues.apache.org/jira/browse/HDFS-1143
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>    Affects Versions: 0.22.0
>            Reporter: Dmytro Molkov
>            Assignee: Scott Chen
>             Fix For: 0.22.0
>         Attachments: HDFS-1143.txt
> Right now if you try to delete massive number of files from the namenode it will freeze
(sometimes for minutes). Most of the time is spent going through the blocks map and invalidating
all the blocks.
> This can probably be improved by having a background GC process. The deletion will basically
just remove the inode being deleted and then give the subtree that was just deleted to the
background thread running cleanup.
> This way the namenode becomes available for the clients soon after deletion, and all
the heavy operations are done in the background.
> Thoughts?

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