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https://issues.apache.org/jira/browse/OAK-3649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15021914#comment-15021914
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Marcel Reutegger commented on OAK-3649:
---------------------------------------

TreeLocks were initially introduced with OAK-1897 because concurrent update() 
and query() calls resulted in stale documents in the cache.

> Extract node document cache from Mongo and RDB document stores
> --------------------------------------------------------------
>
>                 Key: OAK-3649
>                 URL: https://issues.apache.org/jira/browse/OAK-3649
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: documentmk, mongomk, rdbmk
>            Reporter: Tomek Rękawek
>            Priority: Minor
>              Labels: candidate_oak_1_0, candidate_oak_1_2
>             Fix For: 1.3.12
>
>
> MongoDocumentStore and RDBDocumentStore contains copy & pasted methods 
> responsible for handling node document cache. Extract these into a new 
> NodeDocumentCache.



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