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https://issues.apache.org/jira/browse/HDFS-1143?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Scott Chen resolved HDFS-1143.
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Resolution: Not A Problem
> 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
> Attachments: HDFS-1143-v2.txt, 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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