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From Jørgen Løland (JIRA) <j...@apache.org>
Subject [jira] Created: (DERBY-3051) Replication: Modify logging subsystem to append log records to the replication buffer when in replication master mode
Date Wed, 05 Sep 2007 11:30:45 GMT
Replication: Modify logging subsystem to append log records to the replication buffer when
in replication master mode
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                 Key: DERBY-3051
                 URL: https://issues.apache.org/jira/browse/DERBY-3051
             Project: Derby
          Issue Type: Sub-task
          Components: Services, Store
    Affects Versions: 10.4.0.0
            Reporter: Jørgen Løland
            Assignee: Jørgen Løland


When Derby has the replication master role for a database 'x', it should ship all log records
generated for this database to the Derby with the slave role. A replication buffer was added
to Derby in DERBY-2926. This issue is for modifying the logging subsystem to append log records
to this buffer every time a log records is appended to the disk buffer (LogAccessFile). This
will, of course, only be done if it has the master role.

Currently, I have identified two modifications that will be required in LogToFile:

* LogToFile#appendLogRecord needs to append to the replication buffer after appending to the
disk buffer
* LogToFile#flush (i.e., the method used to force buffered log records to disk) must notify
the Master Controller (DERBY-2977) that a flush has taken place. The MasterController will
decide if any action is required because of this. 

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