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From "Emmanuel Lecharny (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DIRSERVER-1377) Potential concurrency issue when adding/modifying/deleting entries at a high rate
Date Wed, 08 Jul 2009 13:33:14 GMT

    [ https://issues.apache.org/jira/browse/DIRSERVER-1377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12728694#action_12728694
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Emmanuel Lecharny commented on DIRSERVER-1377:
----------------------------------------------

After days of painfull debug sessions, code analysis and log grepping, we have moved the serialization
in the backend (JDBM), synchronized correctly JdbmStore, and it seems to have a positive impact.

I've run some test, and was able to inject more than 1 400 000 updates without any problem.

But the oneLevelIndex is still corrupted, we have to understand why.

The idea is to replace the AVLTree by a simple array, which will be sorted. It should be a
bit less expensive in CPU, will suck less memory, and cost more for updates. 

This is what I'm on right now.

> Potential concurrency issue when adding/modifying/deleting entries at a high rate
> ---------------------------------------------------------------------------------
>
>                 Key: DIRSERVER-1377
>                 URL: https://issues.apache.org/jira/browse/DIRSERVER-1377
>             Project: Directory ApacheDS
>          Issue Type: Bug
>    Affects Versions: 1.5.4
>            Reporter: Emmanuel Lecharny
>            Priority: Blocker
>             Fix For: 1.5.5
>
>
> When adding/deleting entries with many clients (a client add and delete an entry many
times), we may have some concurrency problem, as the index are updated without concurrent
acces protection.
> Synchronizing the classes where we update the index might help.

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