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From "Francesco Mari (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (OAK-4579) Improve FileStore.size calculation
Date Fri, 22 Jul 2016 14:11:22 GMT

     [ https://issues.apache.org/jira/browse/OAK-4579?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Francesco Mari updated OAK-4579:
--------------------------------
    Fix Version/s:     (was: Segment Tar 0.0.6)
                   Segment Tar 0.0.8

> Improve FileStore.size calculation
> ----------------------------------
>
>                 Key: OAK-4579
>                 URL: https://issues.apache.org/jira/browse/OAK-4579
>             Project: Jackrabbit Oak
>          Issue Type: Task
>          Components: segment-tar
>            Reporter: Andrei Dulceanu
>            Assignee: Andrei Dulceanu
>            Priority: Minor
>              Labels: resilience
>             Fix For: Segment Tar 0.0.8
>
>
> A new approach for calculating {{FileStore::size}} is needed because this method is prone
to lock contention and should not be called too often.
> The steps to implement the approach are:
> * reduce the lock surface of the size() method. This should be simple enough by creating
a copy of the readers / writer inside the lock and do the actual size calculation on that
snapshot but outside of the lock.
> * lower size() visibility to package to avoid misuse (from monitoring tools)
> * remove {{approximateSize}} and associated logic and replace it with {{size()}}.



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