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Posted to dev@hbase.apache.org by "Manukranth Kolloju (JIRA)" <ji...@apache.org> on 2014/03/21 21:53:45 UTC

[jira] [Created] (HBASE-10808) Simplify Leases by using a ConcurrentHashMap

Manukranth Kolloju created HBASE-10808:
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             Summary: Simplify Leases by using a ConcurrentHashMap
                 Key: HBASE-10808
                 URL: https://issues.apache.org/jira/browse/HBASE-10808
             Project: HBase
          Issue Type: Bug
          Components: Scanners
    Affects Versions: 0.89-fb
            Reporter: Manukranth Kolloju
            Assignee: Manukranth Kolloju
            Priority: Minor
             Fix For: 0.89-fb


This fix simplifies the Leases to use a ConcurrentHashMap instead of a DelayQueue so as to avoid the Synchronization cost. The LeaseChecker now should check the ConcurrentHashMap periodically to check if a scanner has been inactive for atleast the max time. This has a weaker guarantee on when the lease will be expired but is more efficient and decreases the amount of contention.



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