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Date: Tue, 19 Jan 2010 22:45:54 +0000 (UTC)
From: "Ben Hoyt (JIRA)" <jira@apache.org>
To: dev@directory.apache.org
Subject: [jira] Created: (DIRSERVER-1459) Adding members to a groupOfNames
 results in polynomial increase in JDBM partition size
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Adding members to a groupOfNames results in polynomial increase in JDBM partition size
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                 Key: DIRSERVER-1459
                 URL: https://issues.apache.org/jira/browse/DIRSERVER-1459
             Project: Directory ApacheDS
          Issue Type: Bug
    Affects Versions: 1.5.5
         Environment: Any (tested on Linux and Mac OS X)
            Reporter: Ben Hoyt


I noticed a polynomial increase JDBM partition size and therefore disk usage when adding users to groups in my ApacheDS instance.  The vast majority of the usage (95+% once you hit a couple thousand users) is in workingDirectory/partitionId/master.db  

Further testing showed that simply adding a user is linear, as one would expect, and as 'apacheds-tools capacity' confirms.  It is only when a user is made a member of a group that the JDBM partition size shoots up.

Example statistics:
Add 16,000 users - JDBM partition size = ~70 megabytes
Now add those same 16,000 users to a single group (all in the same group) - JDBM partition size = ~19 GIGABYTES

I'll work to attach a test case and some more numbers from my tests

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