cassandra-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Ariel Weisberg (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-11517) o.a.c.utils.UUIDGen could handle contention better
Date Wed, 06 Apr 2016 19:29:25 GMT


Ariel Weisberg commented on CASSANDRA-11517:

|[trunk code|]|[utests|]|[dtests|]|

Not proof of any real performance benefit in context, but the unit test runs in 250 milliseconds
with the CAS loop and 1.4 seconds without the CAS loop.

> 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.

This message was sent by Atlassian JIRA

View raw message