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From "Joshua McKenzie (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-11517) o.a.c.utils.UUIDGen could handle contention better
Date Tue, 03 May 2016 15:38:12 GMT


Joshua McKenzie updated CASSANDRA-11517:
    Reviewer: Branimir Lambov

> o.a.c.utils.UUIDGen could handle contention better
> --------------------------------------------------
>                 Key: CASSANDRA-11517
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Ariel Weisberg
>            Assignee: Ariel Weisberg
>            Priority: Minor
>             Fix For: 3.x
> I noticed this profiling a query handler implementation that uses UUIDGen to get handles
to track queries for logging purposes.
> Under contention threads are being unscheduled instead of spinning until the lock is
available. I would have expected intrinsic locks to be able to adapt to this based on profiling
> Either way it's seems pretty straightforward to rewrite this to use a CAS loop and test
that it generally produces unique values.

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