[infinispan-issues] [JBoss JIRA] (ISPN-2632) Uneven request balancing after node crash

[RH Bugzilla Integration (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-2632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12750319#comment-12750319 ] 

RH Bugzilla Integration commented on ISPN-2632:
-----------------------------------------------

Michal Linhard <mlinhard at redhat.com> made a comment on [bug 886549|https://bugzilla.redhat.com/show_bug.cgi?id=886549]

I calculated how the values of entries in caches and throughput on nodes differ from each other during the test by calculating how each one differs from average (counting only active nodes) these are maximum differences in entry counts and throughput on individual nodes:

32-28-32 test:
entries:     4.8 % (ignoring 6 extreme values)
throughput  17.6 % (ignoring 6 extreme values)

32-31-32 test:
entries:     3.6 % (ignoring one extreme value)
throughput: 18.6 % (ignoring one extreme value)

8-6-8 test:
entries:     7.9 % (ignoring 10 extreme values)
throughput: 17.1 % (ignoring 3 extreme values)

Other than this the tests are fine, no unusual client or server errors in logs.
So this depends on what we're able to tolerate.
                
> Uneven request balancing after node crash
> -----------------------------------------
>
>                 Key: ISPN-2632
>                 URL: https://issues.jboss.org/browse/ISPN-2632
>             Project: Infinispan
>          Issue Type: Bug
>          Components: Remote protocols
>    Affects Versions: 5.2.0.CR1
>            Reporter: Michal Linhard
>            Assignee: Dan Berindei
>            Priority: Blocker
>             Fix For: 5.2.0.CR2, 5.2.0.Final
>
>
> This is a new manifestation of ISPN-1995, but in this case this happens after killing only one node: the hot rod requests aren't very well balanced.
> these runs still manifest also ISPN-2550 and it may be cause of this bug.
> The uneven balancing of requests can be seen here:
> https://jenkins.mw.lab.eng.bos.redhat.com/hudson/view/EDG6/view/EDG-REPORTS-RESILIENCE/job/edg-60-resilience-dist-4-3/59/artifact/report/stats-throughput.png

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