[infinispan-issues] [JBoss JIRA] (ISPN-2096) Duplicate join requests break destabilizes the cluster

[Dan Berindei (JIRA)]

Dan Berindei created ISPN-2096:
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             Summary: Duplicate join requests break destabilizes the cluster
                 Key: ISPN-2096
                 URL: https://issues.jboss.org/browse/ISPN-2096
             Project: Infinispan
          Issue Type: Bug
          Components: State transfer
    Affects Versions: 5.1.5.FINAL
            Reporter: Dan Berindei
            Assignee: Dan Berindei
             Fix For: 5.2.0.ALPHA1


When the coordinator receives a {{CacheViewControlCommand(REQUEST_JOIN)}} command from a node that's already a member of the cache, it should just ignore it. Currently it tries to install a new cache view with a duplicate member, and the new cache view installation fails with this error:

{noformat}
[13:37:08,442] [WARN] (CacheViewControlCommand.java:141) - ISPN000071: Caught exception when handling command CacheViewControlCommand{cache=Demo, type=PREPARE_VIEW, sender=ppl-poz-nb0074/testy, newViewId=2, newMembers=[PPL-POZ-NB0074-33316, PPL-POZ-NB0074-33316], oldViewId=1, oldMembers=[PPL-POZ-NB0074-33316]}
java.lang.IllegalStateException: Cannot prepare new view CacheView{viewId=2, members=[PPL-POZ-NB0074-33316, PPL-POZ-NB0074-33316]} on cache Demo, we are currently preparing view CacheView{viewId=2, members=[PPL-POZ-NB0074-33316, PPL-POZ-NB0074-33316]}
    at org.infinispan.cacheviews.CacheViewInfo.prepareView(CacheViewInfo.java:102)
    at org.infinispan.cacheviews.CacheViewsManagerImpl.handlePrepareView(CacheViewsManagerImpl.java:481)
    at org.infinispan.commands.control.CacheViewControlCommand.perform(CacheViewControlCommand.java:126)
{noformat}

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