[infinispan-issues] [JBoss JIRA] (ISPN-3811) Initial ST leaves node as member without data after MERGE

[Dan Berindei (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-3811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12987458#comment-12987458 ] 

Dan Berindei commented on ISPN-3811:
------------------------------------

I just saw this happening in StateTransferFunctionalTest. 

After a merge/coordinator change, the new coordinator is supposed to add the new members to the CH, but not as owners for any segments. However, in replicated mode, all the members of the CH are considered owners, so the joiner can become a regular owner without actually receiving the data.

> Initial ST leaves node as member without data after MERGE
> ---------------------------------------------------------
>
>                 Key: ISPN-3811
>                 URL: https://issues.jboss.org/browse/ISPN-3811
>             Project: Infinispan
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: State Transfer
>    Affects Versions: 6.0.0.Final
>            Reporter: Radim Vansa
>            Assignee: Dan Berindei
>            Priority: Critical
>              Labels: testsuite_stability
>
> Under certain circumstances, JGroups can issue a MERGE view when a node is joining the cache. The new node joins the cluster, and all nodes have the same cache topology (not containing the joiner yet).
> During the merge, the CH's are joined (through CHFactory.union) and as all report the same topology/hash, the resulting hash is identical. However, the joiner is added to the members list and therefore it can finish the initial state transfer, although no data have been assigned to him.
> Later, the coordinator starts rebalance and the node begins to receive some data, but the thread which started the cluster manager (and should wait until the cluster becomes properly replicated through initial ST)  is already released.



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