[
https://issues.apache.org/jira/browse/DERBY-3184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12550071
]
Jørgen Løland commented on DERBY-3184:
--------------------------------------
Øystein and Dan.
In light of your comments, I agree that this is not the right
solution to the problem. I have a new suggestion for how to solve
this without touching the monitor.
* Add a new implementation of Database, called something like
SlaveDatabase
* Modify canSupport of all instances of Database so that
SlaveDatabase is booted if slave replication is specified
* When booted, SlaveDatabase will spawn a new tread that calls
BasicDatabase#boot(). This thread will be blocked in
LogToFile#recover(). After spawning the thread,
SlaveDatabase#boot finishes. Calls to Monitor#findService will
return the SlaveDatabase object, but all method calls will
result in an SQL Exception with state
CANNOT_CONNECT_TO_DB_IN_SLAVE_MODE:
public LanguageConnectionContext setupConnection(..) {
if (inSlaveMode) {
throw StandardException (SQLState.CANNOT_CONNECT...)
}
return basicDatabase.setupConnection(...);
}
> Replication: Connection attempts to a database in slave mode must fail
> ----------------------------------------------------------------------
>
> Key: DERBY-3184
> URL: https://issues.apache.org/jira/browse/DERBY-3184
> Project: Derby
> Issue Type: Sub-task
> Components: Services
> Affects Versions: 10.4.0.0
> Reporter: Jørgen Løland
> Assignee: Jørgen Løland
> Attachments: derby-3184-1.diff, derby-3184-1.stat
>
>
> When a database 'X' is booted in slave mode, the call to
> Monitor.startPersistentService("X",...) will not complete because the call
> gets stuck in LogToFile#recover. This is intentional.
> For as long as startPersistentService is blocked, however, other threads that
> try to connect to 'X' (effectively calling Monitor.findService("X", ...))
> will also hang. This is unacceptable, and needs to raise an error.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
