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From "Marcel Reutegger (JIRA)" <j...@apache.org>
Subject [jira] Created: (JCR-177) Commit volatile index to disc after some configurable idle time
Date Tue, 09 Aug 2005 08:21:35 GMT
Commit volatile index to disc after some configurable idle time

         Key: JCR-177
         URL: http://issues.apache.org/jira/browse/JCR-177
     Project: Jackrabbit
        Type: Improvement
  Components: query  
 Environment: svn revision: 230783
    Reporter: Marcel Reutegger
    Priority: Minor
     Fix For: 1.0

The query handler keeps the most recent part of the index in memory (volatile index). That
index is committed to disc when a certain amount of nodes (config param: minMergeDocs) has
been added. Most of the times the volatile index will contain some nodes, causing a redo.log
that needs to be applied when the jackrabbit process is killed.

In addition to the size threshold (minMergeDocs) of the volatile index, an idle time limit
should force a commit to disc. The volatile index would be written to disc after some configurable
idle time. This will result in an persistent index (on dic) which is most of the time in sync
with the data, but still minimizes the disc IO during heavy modification activity on the workspace.

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