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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5431) support cachepool-based limit management in path-based caching
Date Wed, 11 Dec 2013 21:47:07 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13845756#comment-13845756
] 

Andrew Wang commented on HDFS-5431:
-----------------------------------

The checkLimit flag makes sense to me, except I'd prefer "force", or if you'd like it flipped,
"enforce" or "strict". This is pretty easy.

I agree on synchronously waiting on the CRM in the listed scenarios, and a CV would be a good
way of doing this. It's a bit complicated though, since I don't think we can get a FSN CV,
especially with the new lock context in HDFS-5453 coming down the pipe I think kicking the
CRM, releasing the FSN lock, waiting on the CRM CV, then regetting the FSN lock should be
okay, but it might be simpler to just call into CRM directly to do the rescan.

I'll try the CV version, but if it looks too messy, we can go with a direct call.

> support cachepool-based limit management in path-based caching
> --------------------------------------------------------------
>
>                 Key: HDFS-5431
>                 URL: https://issues.apache.org/jira/browse/HDFS-5431
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, namenode
>    Affects Versions: 3.0.0
>            Reporter: Colin Patrick McCabe
>            Assignee: Andrew Wang
>         Attachments: hdfs-5431-1.patch, hdfs-5431-2.patch
>
>
> We should support cachepool-based quota management in path-based caching.



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