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From Tomek Rękawek (JIRA) <j...@apache.org>
Subject [jira] [Updated] (OAK-4112) Replace the query exclusive lock with a cache tracker
Date Thu, 10 Mar 2016 09:18:40 GMT

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

Tomek Rękawek updated OAK-4112:
-------------------------------
    Attachment:     (was: OAK-4112.patch)

> 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
>             Fix For: 1.6
>
>         Attachments: 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method, introduced in OAK-1897 to avoid caching outdated documents.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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