[infinispan-issues] [JBoss JIRA] (ISPN-4490) Members can miss the rebalance cancellation on coordinator change

[Dan Berindei (JIRA)]

     [ https://issues.jboss.org/browse/ISPN-4490?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dan Berindei updated ISPN-4490:
-------------------------------

        Status: Resolved  (was: Pull Request Sent)
    Resolution: Done


> Members can miss the rebalance cancellation on coordinator change
> -----------------------------------------------------------------
>
>                 Key: ISPN-4490
>                 URL: https://issues.jboss.org/browse/ISPN-4490
>             Project: Infinispan
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: Core, State Transfer
>    Affects Versions: 7.0.0.Alpha4
>            Reporter: Dan Berindei
>            Assignee: Dan Berindei
>             Fix For: 7.0.0.Alpha5
>
>
> The new coordinator sends first a CH_UPDATE command to cancel the existing rebalance, and then a REBALANCE_START command to start a new rebalance. But the CH_UPDATE command is sent asynchronously, so it's possible for some members to receive it after the REBALANCE_START command.
> If that happens, that node will assume that it will receive the segments it requested for the previous rebalance. But with the ISPN-4484 fix, the provider node cancels the outbound transfer tasks when receiving a CH_UPDATE without a pendingCH, so the state requestor will never receive its segments.
> Even without the ISPN-4484 fix this is a problem, although less obvious. Between the provider node receiving the CH_UPDATE and the REBALANCE_START commands, it won't have the requestor in its write CH, so the requestor can miss transactions.



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