DelegatingSession class wraps ClientSessionImpl and attempts to close
session should it not be closed by the user. It does this by
implementing finalize. However, the order in which finalize runs can be
difficult to predict as compilers, and JIT compilers are able to
optimize early.
The current DelegatingSession was causing problems of finalize getting
called early (before consumers, producers were finished with the
session). This was causing tests to fail on the IBM JDK (which
optimizes early). The same happens on OpenJDK if the GC is forced.
Its now possible to also add the broker name to jmx tree avoiding clashes when multiple brokers are in a single vm. This is now the default but the old way can be used with some configuration
https://issues.apache.org/jira/browse/ARTEMIS-311
Ive renamed the current isSameHost method to isSameparams as thats what it checked and added a new method for isSameHost that checks the appropriate params for the connector. Ive changed ClientSessionFactoryImp to use this to correct the behaviour.
https://issues.apache.org/jira/browse/ARTEMIS-292
When server sends disconnect to the client, the ClientSession schedules
a close task on it's ordered executor. Once the close method starts
it's waits to check to see if all jobs in it's executor has completed.
To do this it adds a job to it's ordered executor, once it is run it
knows there is nothing more to do and thus is ready to close. However,
this causes a deadlock as both jobs are running in the ordered executor
and thus are both waiting on each other. The close eventually timesout
which is why we see the logs as reported in the JIRA.
This commit runs the close method in it's own ordered executor, thus
preventing the two jobs blocking each other.
The failback process needs to be deterministic rather than relying on various
incarnations of Thread.sleep() at crucial points. Important aspects of this
change include:
1) Make the initial replication synchronization process block at the very
last step and wait for a response from the replica to ensure the replica has
as the necessary data. This is a critical piece of knowledge during the
failback process because it allows the soon-to-become-backup server to know
for sure when it can shut itself down and allow the soon-to-become-live
server to take over. Also, introduce a new configuration element called
"initial-replication-sync-timeout" to conrol how long this blocking will occur.
2) Set the state of the server as 'LIVE' only after the server is fully
started. This is necessary because once the soon-to-be-backup server shuts
down it needs to know that the soon-to-be-live server has started fully before
it restarts itself as the new backup. If the soon-to-be-backup server restarts
before the soon-to-be-live is fully started then it won't actually become a
backup server but instead will become a live server which will break the
failback process.
3) Wait to receive the announcement of a backup server before failing-back.
Netty 4.x uses pooled buffers. These buffers can run out of memory when
transferring large amounts of data over connection. This was causing an
OutOfMemory exception to be thrown on the CoreBridge when tranferring
large messages. Netty provides a callback handler to notify listeners
when a Connection is writable. This patch adds the ability to register
connection writable listeners to the Netty connection and registers the
relevant callback from the Bridge to avoid writing when the buffers are
full.
Martyn Taylor
Ville Skyttä
Clebert Suconic
Stuart Douglas
Andy Taylor
jbertram
Ivo Studensky
Petter Nordlander
Julian Scheid