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

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.5.5
• Fix Version/s: 1.5.6, 6.0.0-beta2
• Component/s: wicket
• Environment: ext3, NTFS, and common FSs in general.
• Assignee: Martin Tzvetanov Grigorov
• Reporter: Ondra Žižka
• Created: 27/Mar/12 15:24
• Updated: 29/Mar/12 10:25
• Resolved: 29/Mar/12 10:25

Description

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.

Issue Links

• duplicates: WICKET-1837 DiskPageStore: 32k directory entries.