DiskDataStore to use multi-level directory structure to avoid slowness when
thousands of sessions are active.
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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
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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