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From "Marcel Reutegger (JIRA)" <j...@apache.org>
Subject [jira] Created: (JCR-178) Allow concurrent index updates and queries
Date Tue, 09 Aug 2005 08:56:35 GMT
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
 Assigned to: 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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