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https://issues.apache.org/jira/browse/FLINK-6359?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ted Yu updated FLINK-6359:
--------------------------
Priority: Minor (was: Major)
> Utilize Hierarchical Timing Wheels for performant timer
> -------------------------------------------------------
>
> Key: FLINK-6359
> URL: https://issues.apache.org/jira/browse/FLINK-6359
> Project: Flink
> Issue Type: Improvement
> Components: DataStream API, Local Runtime
> Reporter: Ted Yu
> Priority: Minor
>
> In this thread on mailing list:
> http://search-hadoop.com/m/Flink/VkLeQPmRa31hd5cw
> Gyula Fóra mentioned that timer deletion becomes performance bottleneck due
> to the usage of priority queue.
> Benjamin has an implementation for Hierarchical Timing Wheels (Apache
> License) :
> https://github.com/ben-manes/caffeine/blob/master/caffeine/src/main/java/com/github/benmanes/caffeine/cache/TimerWheel.java
> {code}
> * A hierarchical timer wheel to add, remove, and fire expiration events in
> amortized O(1) time. The
> * expiration events are deferred until the timer is advanced, which is
> performed as part of the
> * cache's maintenance cycle.
> {code}
> We should consider porting the above over to facilitate performant timer.
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