Re: Upgrade to 0.7.1

[Vinayak Borkar]

Hi Zhen,

Thanks for your response.
Here is a snippet of code that creates HelixManager and registers the 
state model factory. As I indicated in my previous email, this code used 
to work with 0.6.2-incubating. All I did was to do whatever I had to do 
to fix the compilation issues.


hManager = HelixManagerFactory.getZKHelixManager(clusterName, id, 
InstanceType.PARTICIPANT, zkAddr);
hManager.getStateMachineEngine().registerStateModelFactory(StateMachineType.MASTER_SLAVE.getStateModelDefId(),
                    new MasterSlaveStateModelFactory(this));
hManager.connect();
hManager.addExternalViewChangeListener(router);
hManager.addInstanceConfigChangeListener(router);
hManager.addLiveInstanceChangeListener(router);


The state model class looks like this:


public class MasterSlaveStateModel extends TransitionHandler {
    @Transition(to = "SLAVE", from = "OFFLINE")
    public void onBecomeSlaveFromOffline(Message message, 
NotificationContext context) throws Exception {
       ...
    }

    @Transition(to = "MASTER", from = "SLAVE")
    public void onBecomeMasterFromSlave(Message message, 
NotificationContext context) throws Exception {
       ...
    }

    @Transition(to = "SLAVE", from = "MASTER")
    public void onBecomeSlaveFromMaster(Message message, 
NotificationContext context) throws Exception {
       ...
    }

    @Transition(to = "OFFLINE", from = "SLAVE")
    public void onBecomeOfflineFromSlave(Message message, 
NotificationContext context) throws Exception {
       ...
    }

    @Transition(to = "DROPPED", from = "OFFLINE")
    public void onBecomeDroppedFromOffline(Message message, 
NotificationContext context) throws Exception {
       ...
    }

    @Transition(to = "OFFLINE", from = "ERROR")
    public void onBecomeOfflineFromError(Message message, 
NotificationContext context) throws Exception {
       ...
    }

    ...
}


Thanks,
Vinayak


On 12/15/14, 11:52 AM, Zhen Zhang wrote:
Hi Vinayak,

We need to add documentation for upgrading 0.6.x to 0.7.1:
https://issues.apache.org/jira/browse/HELIX-560

0.7.1 provides a new set of API. it's not backward compatible in the
sense that all errors should be exposed in compile time. Regarding the
state machine receiving two OFFLINE->SLAVE transitions, could you please
share how you create helix-manager and register state model. Also what's
your state model look like?

Thanks,
Jason


On Sat, Dec 13, 2014 at 8:37 PM, Vinayak Borkar <vinay...@gmail.com
<mailto:vinay...@gmail.com>> wrote:

    Hi Guys,


    Is there a document/checklist to help upgrade and application from
    0.6.x to 0.7.1?

    Here are a few things I had to do to get my code to compile:

    1. Change StateModelFactory -> StateTransitionHandlerFactory
    2. Change StateModel -> TransitionHandler
    3. Use PartitionId and StateModelDefId instead of String.

    Although the code compiles, it does not work as it used to in 0.6.x.

    For example, I am seeing my state machine (Master Slave) receive an
    OFFLINE->SLAVE transition twice.

    Thanks,
    Vinayak