The slave will not notice that a network cable is unplugged and will therefore 
reject failover/stopSlave commands
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                 Key: DERBY-3527
                 URL: https://issues.apache.org/jira/browse/DERBY-3527
             Project: Derby
          Issue Type: Bug
          Components: Replication
    Affects Versions: 10.4.0.0, 10.5.0.0
            Reporter: Jørgen Løland


If a network cable between the master and slave is unplugged (or a switch 
crashes etc), ObjectInputStream#readObject will not get an exception. Neither 
the socket nor the input stream can be queried for information on whether or 
not the connection is working. AFAIK, the only way to find out if the network 
is down is to send a message.

The slave commands stopSlave and failover are rejected if the network 
connection is working. To be absolutely sure that the connection is working, we 
need to ping the master when these commands are requested.

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