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https://issues.apache.org/jira/browse/DIRSERVER-1459?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12803377#action_12803377
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Ben Hoyt commented on DIRSERVER-1459:
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That class is from commons-math. I added that as a dependency in the pom.xml
inside the attached archive. I also tweaked the pom to up the memory for the
test to 1GB. You could either run the test directly from the pom, or add
commons-math to your classpath (and maybe bump your memory setting up however
you are running it)
> Adding members to a groupOfNames results in polynomial increase in JDBM
> partition size
> --------------------------------------------------------------------------------------
>
> 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
> Priority: Blocker
> Fix For: 2.0.0-RC1
>
> Attachments: DIRSERVER-1459.tar.gz, screenshot-1.jpg
>
>
> 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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