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

["Michael Dürig (JIRA)" <ji...@apache.org>]

Michael Dürig created OAK-4122:
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             Summary: Replace the commit semaphore in the segment node store with a commit queue
                 Key: OAK-4122
                 URL: https://issues.apache.org/jira/browse/OAK-4122
             Project: Jackrabbit Oak
          Issue Type: Improvement
          Components: segmentmk
            Reporter: Michael Dürig
             Fix For: 1.6


{{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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