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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