[infinispan-issues] [JBoss JIRA] (ISPN-1799) We should avoid using exceptions for flow control when acquiring state transfer lock

[Dan Berindei (JIRA)]

Dan Berindei created ISPN-1799:
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             Summary: We should avoid using exceptions for flow control when acquiring state transfer lock
                 Key: ISPN-1799
                 URL: https://issues.jboss.org/browse/ISPN-1799
             Project: Infinispan
          Issue Type: Task
          Components: State transfer
    Affects Versions: 5.1.0.FINAL
            Reporter: Dan Berindei
            Assignee: Dan Berindei
             Fix For: 5.2.0.FINAL


We currently use `StateTransferInProgressException` as a marker that a write command failed to acquire the state transfer lock and it should be retried. With ISPN-1704 I added another exception, StateTransferLockReacquisitionException, to signal that a write command failed to re-acquire the state transfer lock after it had already acquired it.

These exceptions often appear in the logs and confuse users (see ISPN-1610), so it would be best to use special return values. We may also need a flag in the InvocationContext for StateTransferLockReacquisitionException.

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