[infinispan-issues] [JBoss JIRA] (ISPN-11377) Change default flow control protocol back to UFC/MFC

[Dan Berindei (Jira)]

Dan Berindei created ISPN-11377:
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             Summary: Change default flow control protocol back to UFC/MFC
                 Key: ISPN-11377
                 URL: https://issues.redhat.com/browse/ISPN-11377
             Project: Infinispan
          Issue Type: Task
          Components: Configuration, Core
    Affects Versions: 11.0.0.Alpha1, 10.1.2.Final, 9.4.18.Final
            Reporter: Dan Berindei
            Assignee: Dan Berindei
             Fix For: 10.1.3.Final, 11.0.0.Alpha2


The server default configuration started using {{UFC_NB}} and {{MFC_NB}} in order to avoid blocking on the Netty event loop threads, slowing client requests, and then the core default configurations started using {{UFC_NB}} and {{MFC_NB}} as well with ISPN-9886.

Unfortunately the _NB variants aren't really non-blocking: they have an extra queue for messages that require more credits, but that queue is limited (2MB by default), and once the queue is full, they also block. They also have much more complex locking than the blocking variants: we actually had to increase max_credits from 2MB to 3MB in order to get the same performance with {{UFC_NB}} that we had with {{UFC}}.

We're changing the defaults back to {{UFC}} and {{MFC}} while we investigate possible alternatives to avoid blocking.



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