Hey Rajiv,
That sounds suspiciously like one of the bugs from 0.9.0.0. Have you
updated kafka-clients to 0.9.0.1?
-Jason
On Mon, Mar 14, 2016 at 11:18 AM, Rajiv Kurian <ra...@signalfx.com> wrote:
> Has any one run into similar problems. I have experienced the same problem
> again. This time when I use kafka-consumer-groups.sh tool it says that my
> consumer group is either missing or rebalancing. But when I use the --list
> method it shows up on the list. So my guess is it is rebalancing some how.
> Again I have a single consumer group per topic with a single consumer in
> that group. Wondering it this causes some edge case. This consumer is up as
> of now, so I don't know why it would say it is rebalancing.
>
> On Wed, Mar 9, 2016 at 11:05 PM, Rajiv Kurian <ra...@signalfx.com> wrote:
>
> > Thanks! That worked. So I see that for the host that I am not getting
> > messages for has a massive lag for the 0th partition (the only one I send
> > messages on). The other 19 groups are all caught up which explains why
> they
> > have no issues. The lag is just increasing with time which confirms my
> > suspicion that no messages are being sent to it. However the owner of the
> > consumer is correctly shown to be the right process
> > (consumer-1_/ip_of_my_consumer).
> >
> > I know that I am calling poll regularly since I record metrics when I
> make
> > the poll call. The fact that Kafka consumer's JMX metrics also show 5
> > responses a second probably proves that the poll call is being made. I am
> > guessing these poll calls yield empty responses and hence my application
> > sees no messages.
> >
> > Is there some known bug where a single consumer group with a single
> > consumer can run into such a problem? What happens if a consumer group
> has
> > a single consumer and it misses it's heart beat? Can it get stuck in
> limbo
> > in such a condition? I am guessing the problem will go away if I restart
> my
> > consumer but I want to try to figure out why it happened and how I can
> > prevent it.
> >
> > I did another experiment. I started sending data on all 8 partitions
> > instead of the 0th partition only. Now I see that the lag for those
> other 7
> > partitions is 0 i.e. they are all caught up. However the 0th partition
> > which is still getting some traffic has the consumer offset at the same
> > number always and hence it's lag increasing. It must be in some kind of
> > limbo that the other partitions are not affected by.
> >
> > Thanks,
> > Rajiv
> >
> > On Wed, Mar 9, 2016 at 10:46 PM, Manikumar Reddy <
> > manikumar.re...@gmail.com> wrote:
> >
> >> We need to pass "--new-consumer" property to kafka-consumer-groups.sh
> >> command to use new consumer.
> >>
> >> sh kafka-consumer-groups.sh --bootstrap-server localhost:9092 --list
> >> --new-consumer
> >>
> >>
> >> On Thu, Mar 10, 2016 at 12:02 PM, Rajiv Kurian <ra...@signalfx.com>
> >> wrote:
> >>
> >> > Hi Guozhang,
> >> >
> >> > I tried using the kafka-consumer-groups.sh --list command and it says
> I
> >> > have no consumer groups set up at all. Yet I am receiving data on 19
> >> out of
> >> > 20 consumer processes (each with their own topic and consumer group).
> >> >
> >> > Here is my full kafka config as printed when my process started up:
> >> >
> >> > metric.reporters = []
> >> >
> >> > metadata.max.age.ms = 300000
> >> >
> >> > value.deserializer = class
> >> > sf.org.apache.kafka9.common.serialization.ByteArrayDeserializer
> >> >
> >> > group.id = myTopic_consumer
> >> >
> >> > partition.assignment.strategy =
> >> > [sf.org.apache.kafka9.clients.consumer.RangeAssignor]
> >> >
> >> > reconnect.backoff.ms = 50
> >> >
> >> > sasl.kerberos.ticket.renew.window.factor = 0.8
> >> >
> >> > max.partition.fetch.bytes = 1048576
> >> >
> >> > bootstrap.servers = [myBroker1:9092, myBroker2:9092,
> >> > myBroker3:9092]
> >> >
> >> > retry.backoff.ms = 100
> >> >
> >> > sasl.kerberos.kinit.cmd = /usr/bin/kinit
> >> >
> >> > sasl.kerberos.service.name = null
> >> >
> >> > sasl.kerberos.ticket.renew.jitter = 0.05
> >> >
> >> > ssl.keystore.type = JKS
> >> >
> >> > ssl.trustmanager.algorithm = PKIX
> >> >
> >> > enable.auto.commit = false
> >> >
> >> > ssl.key.password = null
> >> >
> >> > fetch.max.wait.ms = 1000
> >> >
> >> > sasl.kerberos.min.time.before.relogin = 60000
> >> >
> >> > connections.max.idle.ms = 540000
> >> >
> >> > ssl.truststore.password = null
> >> >
> >> > session.timeout.ms = 30000
> >> >
> >> > metrics.num.samples = 2
> >> >
> >> > client.id =
> >> >
> >> > ssl.endpoint.identification.algorithm = null
> >> >
> >> > key.deserializer = class sf.disco.kafka.VoidDeserializer
> >> >
> >> > ssl.protocol = TLS
> >> >
> >> > check.crcs = true
> >> >
> >> > request.timeout.ms = 40000
> >> >
> >> > ssl.provider = null
> >> >
> >> > ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1]
> >> >
> >> > ssl.keystore.location = null
> >> >
> >> > heartbeat.interval.ms = 3000
> >> >
> >> > auto.commit.interval.ms = 5000
> >> >
> >> > receive.buffer.bytes = 32768
> >> >
> >> > ssl.cipher.suites = null
> >> >
> >> > ssl.truststore.type = JKS
> >> >
> >> > security.protocol = PLAINTEXT
> >> >
> >> > ssl.truststore.location = null
> >> >
> >> > ssl.keystore.password = null
> >> >
> >> > ssl.keymanager.algorithm = SunX509
> >> >
> >> > metrics.sample.window.ms = 30000
> >> >
> >> > fetch.min.bytes = 256
> >> >
> >> > send.buffer.bytes = 131072
> >> >
> >> > auto.offset.reset = earliest
> >> >
> >> > It prints out the group.id field as myTopic_consumer. I was expecting
> >> to
> >> > get this in the --list command and yet I am not getting it. Is this
> the
> >> > name of the consumer group or am I missing something?
> >> >
> >> > I use the subscribe call on the consumer and my understanding was that
> >> the
> >> > subscribe call would do all the work needed to create/join a group.
> >> Given I
> >> > have a single consumer per group and a single group per topic I'd
> >> expect to
> >> > see 20 groups (1 for each of my topics). However the --list returns no
> >> > groups at all!
> >> >
> >> > Thanks,
> >> > Rajiv
> >> >
> >> > On Wed, Mar 9, 2016 at 8:22 PM, Guozhang Wang <wangg...@gmail.com>
> >> wrote:
> >> >
> >> > > Rajiv,
> >> > >
> >> > > In the new Java consumer you used, the ZK dependency has been
> removed
> >> and
> >> > > hence you wont see any data from ZK path.
> >> > >
> >> > > To check the group metadata you can use the ConsumerGroupCommand,
> >> wrapped
> >> > > in bin/kafka-consumer-groups.sh.
> >> > >
> >> > > Guozhang
> >> > >
> >> > > On Wed, Mar 9, 2016 at 5:48 PM, Rajiv Kurian <ra...@signalfx.com>
> >> wrote:
> >> > >
> >> > > > Don't think I made my questions clear:
> >> > > >
> >> > > > On Kafka 0.9.0.1 broker and 0.9 consumer how do I tell what my
> >> > > > consumer-groups are? Can I still get this information in ZK? I
> don't
> >> > see
> >> > > > anything in the consumers folder which is alarming to me. This is
> >> > > > especially alarming because I do see that 8 partitions are
> assigned
> >> on
> >> > > the
> >> > > > consumer (via jmx). I specify the consumer group using:
> >> > > >
> >> > > > String myConsumerGroupId = myTopic + "_consumer";
> >> > > >
> >> > > >
> >> > >
> >> >
> >>
> props.put(org.apache.kafka.clients.consumer.ConsumerConfig.GROUP_ID_CONFIG,
> >> > > > myConsumerGroupId);
> >> > > >
> >> > > > I am running with this setup on about 20 consumers (each
> consuming a
> >> > > unique
> >> > > > topic) and I only see one of my consumers not passing any messages
> >> to
> >> > my
> >> > > > application even though I see that the jmx console says it is
> >> > receiving 5
> >> > > > requests per second. The other 19 seem to be working fine.
> >> > > >
> >> > > > Each of these 20 topics was created when a message was sent to it
> >> i.e.
> >> > it
> >> > > > was not provisioned from before. Messages currently are only being
> >> sent
> >> > > to
> >> > > > partition 0 even though there are 8 partitions per topic.
> >> > > >
> >> > > >
> >> > > > Thanks,
> >> > > >
> >> > > > Rajiv
> >> > > >
> >> > > > On Wed, Mar 9, 2016 at 4:30 PM, Rajiv Kurian <ra...@signalfx.com>
> >> > wrote:
> >> > > >
> >> > > > > Also forgot to mention that when I do consume with the console
> >> > > consumer I
> >> > > > > do see data coming through.
> >> > > > >
> >> > > > > On Wed, Mar 9, 2016 at 3:44 PM, Rajiv Kurian <
> ra...@signalfx.com>
> >> > > wrote:
> >> > > > >
> >> > > > >> I am running the 0.9.0.1 broker with the 0.9 consumer. I am
> using
> >> > the
> >> > > > >> subscribe feature on the consumer to subscribe to a topic with
> 8
> >> > > > partitions.
> >> > > > >>
> >> > > > >> consumer.subscribe(Arrays.asList(myTopic));
> >> > > > >>
> >> > > > >> I have a single consumer group for said topic and a single
> >> process
> >> > > > >> subscribed with 8 partitions.
> >> > > > >>
> >> > > > >> When I use jmx on the consumer I do see that it has 8
> partitions
> >> > > > assigned
> >> > > > >> to it according to the consumer-coordinator-metrics mbean. How
> >> can I
> >> > > > tell
> >> > > > >> what topic it is listening to? I couldn't find this on jmx
> >> > anywhere. I
> >> > > > do
> >> > > > >> see that it is getting 5 responses per second according to the
> >> > > > >> consumer-metrics mbean but I don't see any in my actual
> >> application.
> >> > > > >>
> >> > > > >> I consume my messages like this:
> >> > > > >>
> >> > > > >> public int poll(SubscriptionDataHandler handler, long
> >> timeout) {
> >> > > > >>
> >> > > > >> ConsumerRecords<Void, byte[]> records = null;
> >> > > > >>
> >> > > > >> try {
> >> > > > >>
> >> > > > >> records = consumer.poll(timeout);
> >> > > > >>
> >> > > > >> } catch (Exception e) {
> >> > > > >>
> >> > > > >> logger.error("Exception polling the Kafka , e); //
> >> > Don't
> >> > > > >> see any exceptions here
> >> > > > >>
> >> > > > >> return -1;
> >> > > > >>
> >> > > > >> }
> >> > > > >>
> >> > > > >> int numBuffers = 0;
> >> > > > >>
> >> > > > >> if (records != null) {
> >> > > > >>
> >> > > > >> for (ConsumerRecord<Void, byte[]> record :
> records) {
> >> > > > >>
> >> > > > >> byte[] payload = record.value();
> >> > > > >>
> >> > > > >> if (payload != null && payload.length > 0) {
> >> > > > >>
> >> > > > >> ByteBuffer wrappedBuffer =
> >> > > ByteBuffer.wrap(payload);
> >> > > > >>
> >> > > > >> try {
> >> > > > >>
> >> > > > >> handler.handleData(wrappedBuffer); //
> >> This
> >> > is
> >> > > > >> never called
> >> > > > >>
> >> > > > >> } catch (Exception e) {
> >> > > > >>
> >> > > > >> logger.error("Exception consuming
> buffer
> >> ,
> >> > e);
> >> > > > >>
> >> > > > >> }
> >> > > > >>
> >> > > > >> numBuffers += 1; // This is never
> >> incremented.
> >> > > > >>
> >> > > > >> }
> >> > > > >>
> >> > > > >> }
> >> > > > >>
> >> > > > >>
> >> > > > >> // Commit only after consuming.
> >> > > > >>
> >> > > > >> consumer.commitAsync(offsetCommitCallback);
> >> > > > >>
> >> > > > >> }
> >> > > > >>
> >> > > > >> I also don't see any data in the consumers folder in ZK. In
> fact
> >> it
> >> > is
> >> > > > >> completely empty.
> >> > > > >>
> >> > > > >> When I use the console-consumer, I do see the console-consumer
> >> show
> >> > up
> >> > > > in
> >> > > > >> the consumers folder, but none of my actual consumers show up.
> >> > > > >>
> >> > > > >> I tried looking for jmx data on the servers too and couldn't
> >> quite
> >> > > > figure
> >> > > > >> out where I can get jmax.
> >> > > > >>
> >> > > > >> I am trying to figure out why the Kafka consumer thinks it is
> >> > getting
> >> > > > >> messages ( 5 responses/second according to jmx) but I don't get
> >> any
> >> > in
> >> > > > my
> >> > > > >> application.
> >> > > > >>
> >> > > > >> Thanks,
> >> > > > >> Rajiv
> >> > > > >>
> >> > > > >>
> >> > > > >>
> >> > > > >
> >> > > >
> >> > >
> >> > >
> >> > >
> >> > > --
> >> > > -- Guozhang
> >> > >
> >> >
> >>
> >
> >
>
