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From "Marcel Reutegger (JIRA)" <j...@apache.org>
Subject [jira] Closed: (JCR-178) Allow concurrent index updates and queries
Date Mon, 15 Aug 2005 12:13:54 GMT
     [ http://issues.apache.org/jira/browse/JCR-178?page=all ]
     
Marcel Reutegger closed JCR-178:
--------------------------------


> Allow concurrent index updates and queries
> ------------------------------------------
>
>          Key: JCR-178
>          URL: http://issues.apache.org/jira/browse/JCR-178
>      Project: Jackrabbit
>         Type: Improvement
>   Components: query
>  Environment: svn revision: 231015
>     Reporter: Marcel Reutegger
>     Assignee: Marcel Reutegger
>     Priority: Minor

>
> Currently the query handler either allows one modification or multiple queries at a time.
That is, write operations are separated from read operations. With this synchronization scheme
multiple queries may run concurrently, but only in the absence of a write operation.
> There is one major drawback with this synchronization: a single long running query is
able to block the whole workspace from committing changes. Because the query handler is coupled
to the Workspace via a synchronous event listener, further processing is blocked until the
query handler has finished its event processing (reflecting the changes in the index).
> Instead, each index modification should be non-blocking, in the sense that an index modification
should not have to wait for any queries to complete.

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