[jira] [Closed] (OAK-4112) Replace the query exclusive lock with a cache tracker

["Davide Giannella (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OAK-4112?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Davide Giannella closed OAK-4112.
---------------------------------

Bulk close for 1.5.2

> Replace the query exclusive lock with a cache tracker
> -----------------------------------------------------
>
>                 Key: OAK-4112
>                 URL: https://issues.apache.org/jira/browse/OAK-4112
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: documentmk, mongomk
>            Reporter: Tomek Rękawek
>            Assignee: Tomek Rękawek
>              Labels: performance
>             Fix For: 1.6, 1.5.2
>
>         Attachments: OAK-4112-1.patch, OAK-4112-2.patch, OAK-4112-3.patch, OAK-4112-4.patch, OAK-4112-putifnewer.patch, OAK-4112.patch
>
>
> The {{MongoDocumentStore#query()}} method uses an expensive {{TreeLock#acquireExclusive}} method, introduced in OAK-1897 to avoid caching outdated documents.
> It should be possible to avoid acquiring the exclusive lock, by tracking the cache changes that occurs during the Mongo find() operation. When the find() is done, we can update the cache with the received documents if they haven't been invalidated in the meantime.



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