[infinispan-issues] [JBoss JIRA] (ISPN-2376) KeyAffinityServiceImpl.getKeyForAddress() can loop forever when DefaultConsistentHash has numSegments < numNodes

[Mircea Markus (JIRA)]

     [ https://issues.jboss.org/browse/ISPN-2376?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mircea Markus updated ISPN-2376:
--------------------------------

    Fix Version/s: 5.2.0.CR1
                       (was: 5.2.0.Beta2)

    
> KeyAffinityServiceImpl.getKeyForAddress() can loop forever when DefaultConsistentHash has numSegments < numNodes
> ----------------------------------------------------------------------------------------------------------------
>
>                 Key: ISPN-2376
>                 URL: https://issues.jboss.org/browse/ISPN-2376
>             Project: Infinispan
>          Issue Type: Bug
>          Components: Core API
>    Affects Versions: 5.2.0.Beta1
>            Reporter: Scott Marlow
>            Assignee: Dan Berindei
>             Fix For: 5.2.0.CR1
>
>
> I instrumented KeyAffinityServiceImpl and DefaultConsistentHash to show why KeyAffinityServiceImpl is looping forever when running the AS7 clustered tests with some recent changes that aren't committed yet.  We are hoping to get through this failure so we can get clustered tests running again more completely on our continuous test server (lightning).
> We have two nodes running in the AS cluster, node-0/web and node-1/web.  
> In my recent test run, I stopped the test after it was stuck for a while.  Below is some of the instrumented logging output.
> {quote}
> KeyAffinityServiceImpl interestedInAddress() check, for address: node-1/web, filter.contains(address) returns false, filter contents [node-0/web]
> .
> .
> .
> KeyAffinityServiceImpl.getKeyForAddress() loop # 1455775 will loop again since result is null, queue [], address node-0/web
> {quote}
> We are using address "node-1/web" because that is passed into the DefaultConsistentHash constructor segmentOwners parameter (element zero). 
> Later, address=node-1/web is the primary owner of the consistent hash (hash=DefaultConsistentHash{numSegments=1, numOwners=2, members=[node-1/web, node-0/web], segmentOwners={0: 0 1}).
> I'm still collecting information and want to get a little more.  
> Let me know if there is anything that you would like to see.

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