[jira] [Resolved] (WICKET-4478) DiskDataStore to use multi-level directory structure to avoid slowness when thousands of sessions are active.

["Martin Grigorov (Resolved) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/WICKET-4478?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Martin Grigorov resolved WICKET-4478.
-------------------------------------

       Resolution: Fixed
    Fix Version/s: 6.0.0-RC1
                   1.5.6

Improved by re-applying the patch from WICKET-1837.

It uses the hashcode of the sessionId string to make it better distributed.
                
> DiskDataStore to use multi-level directory structure to avoid slowness when thousands of sessions are active.
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: WICKET-4478
>                 URL: https://issues.apache.org/jira/browse/WICKET-4478
>             Project: Wicket
>          Issue Type: Improvement
>          Components: wicket
>    Affects Versions: 1.5.5
>         Environment: ext3, NTFS, and common FSs in general.
>            Reporter: Ondra Žižka
>            Assignee: Martin Grigorov
>             Fix For: 1.5.6, 6.0.0-RC1
>
>         Attachments: fix-WICKET-4478.patch
>
>
> If the number of sessions opened rises to thousands, DiskDataStore, which is default, doesn't scale, because it creates one dir for each session, and most filesystems don't perform well with large number of records in a dir. More, there's a hard limit e.g. for ext3 it's 31998.
> So I suggest to make it multi-level - simply, instead of "tmp/abcdef" it would be "tmp/a/b/cdef", where number of levels added would be configurable.

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