[jira] Updated: (DIRSERVER-1459) Adding members to a groupOfNames results in polynomial increase in JDBM partition size

["Ben Hoyt (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DIRSERVER-1459?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ben Hoyt updated DIRSERVER-1459:
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    Attachment: screenshot-1.jpg

Partition size on disk (y axis) per number of users who are also in a group (x axis).

> 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
>         Attachments: 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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