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From "vlad.gm@gmail.com" <vlad...@gmail.com>
Subject Re: NPE during start up
Date Mon, 16 Feb 2015 03:18:20 GMT
In my experience it was fatal. The callback would jot be called but the
controller would somehow assume the state transition occurred.
On Feb 15, 2015 7:13 PM, "kishore g" <g.kishore@gmail.com> wrote:

> Thanks Vlad. That explains the problem. That also explains how adding
> sleep of 3seconds work.
>
> Jason, is this exception fatal?. Will the message be processed again after
> the handler is added.
>
> thanks,
> Kishore G
>
> On Sun, Feb 15, 2015 at 6:41 PM, vlad.gm@gmail.com <vlad.gm@gmail.com>
> wrote:
>
>> https://issues.apache.org/jira/browse/HELIX-548
>> On Feb 15, 2015 6:38 PM, "kishore g" <g.kishore@gmail.com> wrote:
>>
>> > Hi Vlad,
>> >
>> > Was there any jira associated with it?
>> >
>> > thanks.
>> > Kishore G
>> >
>> > On Sun, Feb 15, 2015 at 4:36 PM, vlad.gm@gmail.com <vlad.gm@gmail.com>
>> > wrote:
>> >
>> >> Looks like the same problem we encountered recently.
>> >>
>> >> Regards,
>> >> Vlad
>> >> On Feb 15, 2015 4:35 PM, "kishore g" <g.kishore@gmail.com> wrote:
>> >>
>> >> > Steph described this problem on IRC.
>> >> >
>> >> > He is using 0.7.1. On connecting to cluster he gets this NPE
>> >> >
>> >> > http://pastebin.com/YE3fwK5i
>> >> >
>> >> > java.lang.NullPointerException
>> >> >         at
>> >> >
>> >>
>> org.apache.helix.messaging.handling.HelixTaskExecutor.createMessageHandler(HelixTaskExecutor.java:661)
>> >> >         at
>> >> >
>> >>
>> org.apache.helix.messaging.handling.HelixTaskExecutor.onMessage(HelixTaskExecutor.java:581)
>> >> >         at
>> >> >
>> >>
>> org.apache.helix.manager.zk.ZkCallbackHandler.invoke(ZkCallbackHandler.java:202)
>> >> >         at
>> >> >
>> >>
>> org.apache.helix.manager.zk.ZkCallbackHandler.init(ZkCallbackHandler.java:336)
>> >> >         at
>> >> >
>> >>
>> org.apache.helix.manager.zk.ZkCallbackHandler.<init>(ZkCallbackHandler.java:130)
>> >> >         at
>> >> >
>> >>
>> org.apache.helix.manager.zk.ZkHelixConnection.addListener(ZkHelixConnection.java:533)
>> >> >         at
>> >> >
>> >>
>> org.apache.helix.manager.zk.ZkHelixConnection.addMessageListener(ZkHelixConnection.java:267)
>> >> >         at
>> >> >
>> >>
>> org.apache.helix.manager.zk.ZkHelixParticipant.setupMsgHandler(ZkHelixParticipant.java:347)
>> >> >         at
>> >> >
>> >>
>> org.apache.helix.manager.zk.ZkHelixParticipant.init(ZkHelixParticipant.java:383)
>> >> >         at
>> >> >
>> >>
>> org.apache.helix.manager.zk.ZkHelixParticipant.onConnected(ZkHelixParticipant.java:401)
>> >> >         at
>> >> >
>> >>
>> org.apache.helix.manager.zk.ZkHelixParticipant.start(ZkHelixParticipant.java:428)
>> >> >         at
>> >> >
>> >>
>> com.example.ProtostuffServerNode.spinUpParticipant(ProtostuffServerNode.java:134)
>> >> >
>> >> >
>> >> > Here is his connection code.
>> >> >
>> >> > http://pastebin.com/QRfVU1tc
>> >> >
>> >> > private static HelixParticipant spinUpParticipant(HelixAdmin admin,
>> >> > ParticipantId participantId) {
>> >> >                 LOGGER.info("Starting up "+participantId);
>> >> >                 HelixConnection connection = new ZkHelixConnection(
>> >> > ZK_ADDRESS);
>> >> >                 connection.connect();
>> >> >                 HelixParticipant participant = connection.
>> >> > createParticipant(CLUSTER_ID, participantId);
>> >> >                 StateMachineEngine stateMach = participant.
>> >> > getStateMachineEngine();
>> >> >
>> >> >                 StateTransitionHandlerFactory<LocalTransitionHandler>
>> >> > transitionHandlerFactory = new OnlineOfflineHandlerFactory();
>> >> >                 stateMach.registerStateModelFactory(STATE_MODEL_NAME,
>> >> > transitionHandlerFactory);
>> >> >                 participant.start();
>> >> >
>> >> >                 admin.enableInstance(CLUSTER_NAME,
>> >> participantId.toString(
>> >> > ), true);
>> >> >
>> >> >                 return participant;
>> >> >         }
>> >> >
>> >> > Adding 3s sleep after registerStateModelFactory works. Any idea what
>> is
>> >> > happening.
>> >> >
>> >> > thanks,
>> >> > Kishore G
>> >> >
>> >> >
>> >> >
>> >> >
>> >>
>> >
>> >
>>
>
>

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