[jira] [Created] (IGNITE-11460) MVCC: Possible race on coordinator changing on client reconnection.

["Amelchev Nikita (JIRA)" <ji...@apache.org>]

Amelchev Nikita created IGNITE-11460:
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             Summary: MVCC: Possible race on coordinator changing on client reconnection.
                 Key: IGNITE-11460
                 URL: https://issues.apache.org/jira/browse/IGNITE-11460
             Project: Ignite
          Issue Type: Bug
            Reporter: Amelchev Nikita
            Assignee: Amelchev Nikita
             Fix For: 2.8


I found that the wrong coordinator can be set in case of client reconnect:
{noformat}
assert newCrd.topologyVersion().compareTo(curCrd.topologyVersion()) > 0;

java.lang.AssertionError
    at org.apache.ignite.internal.processors.cache.mvcc.MvccProcessorImpl.onCoordinatorChanged(MvccProcessorImpl.java:541)
    at org.apache.ignite.internal.processors.cache.mvcc.MvccProcessorImpl.onLocalJoin(MvccProcessorImpl.java:416)
    at org.apache.ignite.internal.managers.discovery.GridDiscoveryManager$4.onDiscovery0(GridDiscoveryManager.java:851)
    at org.apache.ignite.internal.managers.discovery.GridDiscoveryManager$4.lambda$onDiscovery$0(GridDiscoveryManager.java:601)
    at org.apache.ignite.internal.managers.discovery.GridDiscoveryManager$DiscoveryMessageNotifierWorker.body0(GridDiscoveryManager.java:2681)
    at org.apache.ignite.internal.managers.discovery.GridDiscoveryManager$DiscoveryMessageNotifierWorker.body(GridDiscoveryManager.java:2719)
    at org.apache.ignite.internal.util.worker.GridWorker.run(GridWorker.java:120)
    at java.lang.Thread.run(Thread.java:748)
{noformat}
I have attached reproducer in PR.

The main reason is that coordinator can be changed from discovery event thread when the client already disconnect (disconnection processed in notifier thread and change coordinator on onDisconnected method).
Coordinator can be changed in cases:
1. notifier disco thread: onDisconnected method
2. event disco thread: onDiscovery listener.
and events can be processed with some delay and override coordinator that set in notifier thread. 



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