ConfX created HADOOP-18905:
------------------------------

             Summary: Negative timeout in ZKFailovercontroller due to overflow
                 Key: HADOOP-18905
                 URL: https://issues.apache.org/jira/browse/HADOOP-18905
             Project: Hadoop Common
          Issue Type: Bug
    Affects Versions: 3.3.6
            Reporter: ConfX


Graceful fence timeout of FailoverController in ZKFailovercontroller equals to 
`ha.failover-controller.graceful-fence.rpc-timeout.ms` * 2. Since users are 
unaware of this calculation, it thus has risks of overflowing to a negative 
number if users set `ha.failover-controller.graceful-fence.rpc-timeout.ms` to a 
large value.
 
To reproduce:
1. set `ha.failover-controller.graceful-fence.rpc-timeout.ms` to 1092752431
2. run `mvn surefire:test 
-Dtest=org.apache.hadoop.ha.TestZKFailoverController#testGracefulFailoverFailBecomingStandby`
 
This PR provides a fix by checking the timeout after multiplication is at least 
0.
 



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