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Posted to oak-issues@jackrabbit.apache.org by "Marcel Reutegger (JIRA)" <ji...@apache.org> on 2015/07/16 10:31:04 UTC

[jira] [Created] (OAK-3112) Performance degradation of UnsavedModifications on MapDB

Marcel Reutegger created OAK-3112:
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             Summary: Performance degradation of UnsavedModifications on MapDB
                 Key: OAK-3112
                 URL: https://issues.apache.org/jira/browse/OAK-3112
             Project: Jackrabbit Oak
          Issue Type: Bug
          Components: core, mongomk
    Affects Versions: 1.0.17, 1.0.16, 1.0.15, 1.0.14, 1.0.13, 1.0.12, 1.0.11, 1.0.10, 1.0.9, 1.0.8, 1.0.7
            Reporter: Marcel Reutegger
            Assignee: Marcel Reutegger
             Fix For: 1.0.18


UnsavedModifications performance degrades when used in combination with the MapDB backed MapFactory. Calls become more and more expensive the longer the instance is in use. The is caused by a limitation of MapDB, which does not remove empty BTree nodes.

A test performed with random paths added to the map and later removed again in a loop shows a increase to roughly 1 second to read keys present in the map when the underlying data file is about 50MB in size.



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