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

[Dan Berindei (JIRA)]

Dan Berindei created ISPN-5642:
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             Summary: 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
            Priority: Minor
             Fix For: 8.0.0.Final


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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