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 Labels: help_wanted Fix For: 8.1.0.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.