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Posted to oak-issues@jackrabbit.apache.org by "Stefan Egli (JIRA)" <ji...@apache.org> on 2015/02/23 14:59:11 UTC

[jira] [Created] (OAK-2546) allow configuring subcaches of documentnodestore individually

Stefan Egli created OAK-2546:
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             Summary: allow configuring subcaches of documentnodestore individually
                 Key: OAK-2546
                 URL: https://issues.apache.org/jira/browse/OAK-2546
             Project: Jackrabbit Oak
          Issue Type: Improvement
          Components: mongomk
    Affects Versions: 1.1.6, 1.0.11
            Reporter: Stefan Egli


Currently there's one config for the DocumentNodeStore's (actually DocumentMk) caches (Documents, Diff, DocChildren, NodeChildren, NodeState) as a whole, and it distributes to each of those subcaches in a [hard-coded way|https://github.com/apache/jackrabbit-oak/blob/trunk/oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/document/DocumentMK.java#L732].

The reason I bring this up is where I think it might be useful to try out giving the NodeChildren relatively more cache as it turned out during a heavy-load test that observation queues were starting to grow at the same point in time when the NodeChildren cache started to perform badly. While the problem there is relative bad performance of one or a few observation listeners, it could nevertheless help bridge a situation when the NodeChildren cache contains a longer 'history' so that the slow listener could catch up.

PS: Leaving it up to discussion as to whether this goes into 1.0 branch or not



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