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

["Ondra Žižka (Updated JIRA)" <ji...@apache.org>]

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

Ondra Žižka updated WICKET-4478:
--------------------------------

    Attachment: fix-WICKET-4478.patch

Something like this.
It's a 2-level dir, using first char.
                
> 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
>         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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