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

[Dan Berindei (JIRA)]

Dan Berindei created ISPN-4490:
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             Summary: 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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