Can you send around your code snippet and related NPE stack trace?
On Fri, Oct 11, 2013 at 8:01 AM, Tanguy tlrx <tlrx....@gmail.com> wrote: > Hi Neha, > > Thanks for the tip but calling again createMessageStreams() on a > ConsumerConnector object that has been shut down throws a > NullPointerException. > > Did you manage to get it work? > > > > 2013/10/11 Neha Narkhede <neha.narkh...@gmail.com> > > > Best way to shutdown is to invoke the shutdown() API. To restart, you > need > > to createMessageStreams() > > > > Thanks, > > Neha > > On Oct 11, 2013 6:10 AM, "Tanguy tlrx" <tlrx....@gmail.com> wrote: > > > > > Thanks Jun, > > > > > > Jira issue has been filled: > > > https://issues.apache.org/jira/browse/KAFKA-1083 > > > > > > By the way, what is the recommended way to start, stop and restart a > > > ConsumerConnector in the same running JMV? > > > > > > Thanks, > > > > > > > > > 2013/10/10 Jun Rao <jun...@gmail.com> > > > > > > > Each time we create a new consumer connector, we assign a random > > consumer > > > > id by default. You can try setting "consumer.id" to use a fixed > > consumer > > > > id. In any case, we probably should deregister those beans when > > shutting > > > > down the connector. Could you file a jira? > > > > > > > > Thanks, > > > > > > > > Jun > > > > > > > > > > > > On Thu, Oct 10, 2013 at 7:55 AM, Tanguy tlrx <tlrx....@gmail.com> > > wrote: > > > > > > > > > It's in 0.8. > > > > > > > > > > The JMX names are not exactly the same, but I see 2 beans with > > similar > > > > > names, something like: > > > > > > > > > > > > > > > > > > > > > > > > > "my_consumer_group-my_consumer-mytopic-my_consumer_hostname.thing.com-1381416134138-3573c8bf-7-FetchQueueSize" > > > > > > > > > > -- Tanguy > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > 2013/10/10 Jun Rao <jun...@gmail.com> > > > > > > > > > > > Is that in 0.7 or 0.8? JMX won't allow a bean with the same name > to > > > be > > > > > > registered twice. Do you see 2 beans with similar names? What are > > the > > > > > exact > > > > > > bean names? > > > > > > > > > > > > Thanks, > > > > > > > > > > > > Jun > > > > > > > > > > > > > > > > > > On Thu, Oct 10, 2013 at 2:42 AM, Tanguy tlrx <tlrx....@gmail.com > > > > > > wrote: > > > > > > > > > > > > > Hi all, > > > > > > > > > > > > > > In our application, we are currently starting a Kafka Consumer > > with > > > > the > > > > > > > following lines of code: > > > > > > > > > > > > > > connector = > Consumer.createJavaConsumerConnector(consumerConfig); > > > > > > > streams = connector .createMessageStreams(map); > > > > > > > > > > > > > > Then, each KafkaStream is processed in a dedicated thread per > > topic > > > > and > > > > > > > partition, as documented here > > > > > > > > > > > > > > > > https://cwiki.apache.org/confluence/display/KAFKA/Consumer+Group+Example > > > > > > > > > > > > > > We need to stop (halt) and restart the consumer. Today, we just > > > call: > > > > > > > > > > > > > > connector.shutdown() > > > > > > > > > > > > > > and wait for threads to terminate. > > > > > > > > > > > > > > To restart the consumer, we create a new connector: > > > > > > > > > > > > > > connector = > Consumer.createJavaConsumerConnector(consumerConfig); > > > > > > > > > > > > > > When restarting is complete, I can see that a JMX MBean (we > use > > > > > Metrics > > > > > > > JMXReporter) like "ZookeeperConsumerConnector" is registered > > twice. > > > > > This > > > > > > > bean is not registered when the previous connector instance is > > shut > > > > > down. > > > > > > > > > > > > > > What is the best way to stop/halt and restart a Consumer using > > the > > > > Java > > > > > > > API? > > > > > > > > > > > > > > Is it normal that the MBean is not unregistered at shutdown > time? > > > > > > > > > > > > > > Thanks, > > > > > > > > > > > > > > -- Tanguy > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > > -- Tanguy > > > > > twitter @tlrx > > > > > https://github.com/tlrx > > > > > > > > > > > > > > > > > > > > > -- > > > -- Tanguy > > > twitter @tlrx > > > https://github.com/tlrx > > > > > > > > > -- > -- Tanguy > twitter @tlrx > https://github.com/tlrx >
