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From "Chetan Mehrotra (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-3112) Performance degradation of UnsavedModifications on MapDB
Date Tue, 21 Jul 2015 10:17:04 GMT

    [ https://issues.apache.org/jira/browse/OAK-3112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14634910#comment-14634910
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Chetan Mehrotra commented on OAK-3112:
--------------------------------------

+1. Looks fine. However as discussed we can commit this but leave out enabling by default
untill we have some coverage via longevity runs. Then we can enabled this by default

> 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: 1.0.7, 1.0.8, 1.0.9, 1.0.10, 1.0.11, 1.0.12, 1.0.13, 1.0.14, 1.0.15,
1.0.16, 1.0.17
>            Reporter: Marcel Reutegger
>            Assignee: Marcel Reutegger
>              Labels: performance
>             Fix For: 1.0.18
>
>         Attachments: OAK-3112.patch
>
>
> 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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