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From Jørgen Løland (JIRA) <j...@apache.org>
Subject [jira] Created: (DERBY-3527) The slave will not notice that a network cable is unplugged and will therefore reject failover/stopSlave commands
Date Wed, 12 Mar 2008 14:48:46 GMT
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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