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https://issues.apache.org/jira/browse/HDFS-5430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13829663#comment-13829663
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Andrew Wang commented on HDFS-5430:
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Couple further notes, I did a couple missed PATH_BASED renames as well, and
changed the edit log loading for addDirective since I think it would
potentially allow users to pass in their own directive IDs.
> Support TTL on CacheBasedPathDirectives
> ---------------------------------------
>
> Key: HDFS-5430
> URL: https://issues.apache.org/jira/browse/HDFS-5430
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode, namenode
> Reporter: Colin Patrick McCabe
> Assignee: Andrew Wang
> Priority: Minor
> Attachments: hdfs-5430-1.patch
>
>
> It would be nice if CacheBasedPathDirectives would support an expiration
> time, after which they would be automatically removed by the NameNode. This
> time would probably be in wall-block time for the convenience of system
> administrators.
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