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
>
