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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4928) Deadlock-prone synchronization in BasicDependencyManager
Date Tue, 07 Dec 2010 12:32:09 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12968701#action_12968701

Kristian Waagan commented on DERBY-4928:

Regression tests passed.
I haven't seen the hang with the automatic index statistics update feature using this patch
either,although I haven't run the tests that many times yet.

> Deadlock-prone synchronization in BasicDependencyManager
> --------------------------------------------------------
>                 Key: DERBY-4928
>                 URL: https://issues.apache.org/jira/browse/DERBY-4928
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions:
>            Reporter: Kristian Waagan
>            Assignee: Kristian Waagan
>         Attachments: derby-4928-1a-depman_sync_and_cleanup.diff
> The synchronization in BasicDependencyManager is prone to deadlock, because database
locks are obtained while holding the monitor on "this".
> Problem observed when testing the automatic index statistics update prototype.
> There are comments in the file suggesting that in-memory dependencies should be accessed
while holding the Java monitor, but the monitor should not be held when accessing stored dependencies.
The implementation is breaking this rule/suggestion.

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