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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 Sat, 20 Jun 2009 12:30:07 GMT

    [ https://issues.apache.org/jira/browse/DIRSERVER-1377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12722181#action_12722181
] 

Emmanuel Lecharny commented on DIRSERVER-1377:
----------------------------------------------

Index operations must be ACID : when modifying the values, no other thread should be able
to access them until the modification is done. That mean we must provide a copy of the values
when a search is done, as we can't keep a lock on the associated tree while the server is
generating the response (it might take way too long).

Each index must be protected against concurrent access.

> 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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