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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