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  1. Accumulo
  2. ACCUMULO-3509

Scanner lock cause Tablet lock, hence preventing idle scans from being swept, hence blocking SimpleTimer thread

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 1.6.0
    • Fix Version/s: 1.6.5, 1.7.1, 1.8.0
    • Component/s: tserver
    • Labels:
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      Description

      Synchronization with Tablet$Scanner via a read() will block close() being called via the sweep method in TabletServer. As a result, the SimpleTimer thread does not continue, and idle threads grow until the scan completes.

      My patch, which is forthcoming, converts synchronized methods to use a fair lock. If the lock is held by a read call, the close call will attempt to obtain it, time out, and return indicating a close was not successful. The sweep will continue, and the SimpleTimer thread will respawn later, attempting closure on those Tablets at a later time.

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              • Assignee:
                phrocker marco polo
                Reporter:
                phrocker marco polo
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