[infinispan-issues] [JBoss JIRA] (ISPN-5642) Reduce contention in the RPC timeout handling

[Tristan Tarrant (JIRA)]

     [ https://issues.jboss.org/browse/ISPN-5642?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tristan Tarrant updated ISPN-5642:
----------------------------------
    Fix Version/s: 9.0.0.Alpha3
                       (was: 9.0.0.Alpha2)


> Reduce contention in the RPC timeout handling
> ---------------------------------------------
>
>                 Key: ISPN-5642
>                 URL: https://issues.jboss.org/browse/ISPN-5642
>             Project: Infinispan
>          Issue Type: Task
>          Components: Core
>    Affects Versions: 8.0.0.Beta2
>            Reporter: Dan Berindei
>            Assignee: Dan Berindei
>            Priority: Minor
>              Labels: help_wanted
>             Fix For: 9.0.0.Alpha3
>
>
> Most of the RPC timeout tasks are cancelled way before their timeout expires. This means the scheduler spends a lot of time reordering the elements of its DelayQueue.
> It should be possible to store the tasks with a long timeout (e.g. 1s) in a queue and only move them to the scheduler's priority queue when they have less than 1s to expiration (e.g. by a worker thread that runs every 0.5s)
> Storing all the tasks in a single queue may be impractical because the worker thread would have more and work to do as load increases and the RPCs take longer to finish, so a [hashed timing wheel|http://www.cse.wustl.edu/~cdgill/courses/cs6874/TimingWheels.ppt] may be needed.



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