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Posted to oak-issues@jackrabbit.apache.org by "Davide Giannella (JIRA)" <ji...@apache.org> on 2017/07/06 15:35:05 UTC

[jira] [Closed] (OAK-4122) Replace the commit semaphore in the segment node store with a scheduler

     [ https://issues.apache.org/jira/browse/OAK-4122?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Davide Giannella closed OAK-4122.
---------------------------------

Bulk close for 1.7.3

> Replace the commit semaphore in the segment node store with a scheduler
> -----------------------------------------------------------------------
>
>                 Key: OAK-4122
>                 URL: https://issues.apache.org/jira/browse/OAK-4122
>             Project: Jackrabbit Oak
>          Issue Type: New Feature
>          Components: segment-tar
>            Reporter: Michael Dürig
>            Assignee: Andrei Dulceanu
>              Labels: operations, performance, scalability, throughput
>             Fix For: 1.8, 1.7.3
>
>
> {{SegmentNodeStore}} currently uses a semaphore to coordinate concurrent commits thus relying on the scheduling algorithm of that implementation and ultimately of the JVM for in what order commits are processed. 
> I think it would be beneficial to replace that semaphore with an explicit queue of pending commit. This would allow us to implement a proper scheduler optimising for e.g. minimal system load, maximal throughput or minimal latency etc. A scheduler could e.g. give precedence to big commits and order commits along the order of its base revisions, which would decrease the amount of work to be done in rebasing. 



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