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https://issues.apache.org/jira/browse/DERBY-3382?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12569227#action_12569227
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Jørgen Løland commented on DERBY-3382:
--------------------------------------

I had a look at the hang, which is caused by LogToFile calling 
masterFac#flushedTo:

lines 3966 and on...: 
if (inReplicationMasterMode) {
        masterFactory.flushedTo(LogCounter.
                                                      
makeLogInstantAsLong(fileNumber,
                                                                                
                  wherePosition));
}

Seems like LogToFile was never informed that it is no longer in replication 
mode :-/

> Replication: Slave must inform master if DBs are out of sync.
> -------------------------------------------------------------
>
>                 Key: DERBY-3382
>                 URL: https://issues.apache.org/jira/browse/DERBY-3382
>             Project: Derby
>          Issue Type: Bug
>          Components: Replication
>    Affects Versions: 10.4.0.0
>            Reporter: Øystein Grøvlen
>            Assignee: Jørgen Løland
>             Fix For: 10.4.0.0
>
>         Attachments: derby-3382-1a.diff, derby-3382-1a.stat
>
>
> If I copy the database to the slave before booting the master, slave will be 
> out of sync with the master since new log records are created during booting. 
>  The slave will then stop replication, but the master will not be notified.
> If I then try to stop or failover the master the master will hang.

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