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From "Laxman (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6096) AccessController v2
Date Thu, 07 Jun 2012 19:26:23 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13291237#comment-13291237

Laxman commented on HBASE-6096:

bq. I don't understand why we need synchronize on _CACHE maps, the only one that update those
maps is ZKPermissionWatcher... and the zookeeper events should be dispatched in a single thread.
Am I missing something?

@Matt, updates & reads from occurs in two multiple threads.

1) access control operations(grant/revoke via ZKPermissionWatcher) updates USER_CACHE &
2) user operations(Any operation in matrix) reads from USER_CACHE & GROUP_CACHE.

And these data structures [ArrayListMultimap] are not thread-safe.
Hope this clarifies.
> AccessController v2
> -------------------
>                 Key: HBASE-6096
>                 URL: https://issues.apache.org/jira/browse/HBASE-6096
>             Project: HBase
>          Issue Type: Umbrella
>          Components: security
>    Affects Versions: 0.96.0, 0.94.1
>            Reporter: Andrew Purtell
>         Attachments: Security-ACL Matrix.pdf
> Umbrella issue for iteration on the initial AccessController drop.

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