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From "Alex Parvulescu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-4881) Make merge semaphore in SegmentNodeStore fair by default
Date Tue, 04 Oct 2016 08:18:20 GMT

    [ https://issues.apache.org/jira/browse/OAK-4881?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15544704#comment-15544704
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Alex Parvulescu commented on OAK-4881:
--------------------------------------

bq. Further going forward OAK-4122 would replace the lock
this applies to {{segment-tar}} only.

> Make merge semaphore in SegmentNodeStore fair by default
> --------------------------------------------------------
>
>                 Key: OAK-4881
>                 URL: https://issues.apache.org/jira/browse/OAK-4881
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: segment-tar, segmentmk
>            Reporter: Chetan Mehrotra
>              Labels: candidate_oak_1_0, candidate_oak_1_2, candidate_oak_1_4
>             Fix For: 1.6
>
>
> Currently the merge semaphore in SegmentNodeStore is by default non fair. OAK-3588 provided
a config option to make it fair.
> We should change the default to fair so as to ensure writer threads never get starved.

> Eventually this change would need to be backported to branches. Further going forward
OAK-4122 would replace the lock



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