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From Yury Ruchin <yuri.ruc...@gmail.com>
Subject Re: Kafka 0.8's VerifyConsumerRebalance reports an error
Date Thu, 26 Jun 2014 12:24:51 GMT
I have set log level to DEBUG and saw something strange in the output. For
each topic partition, I see the following pattern:

[2014-06-26 16:00:24,467] ERROR No owner for partition [<topic_name>,0]
(kafka.tools.VerifyConsumerRebalance$)

...

[2014-06-26 16:00:24,469] INFO Owner of partition [<topic_name>,0] is
<consumer_name>_<node_name>-1403049600000-abc12345-0
(kafka.tools.VerifyConsumerRebalance$)

As I understand VerifyConsumerRebalance.scala, those 2 messages should be
mutually exclusive, but their both appear for every partition. With the
default log settings, only that with ERROR level is shown to user.

Is this a problem with the tool?

2014-06-25 2:04 GMT+04:00 Neha Narkhede <neha.narkhede@gmail.com>:

> I would turn on DEBUG on the tool to see which url it reads and doesn't
> find the owners.
>
>
>
>
> On Tue, Jun 24, 2014 at 11:28 AM, Yury Ruchin <yuri.ruchin@gmail.com>
> wrote:
>
> > I've just double-checked. The URL is correct, the same one is used by
> Kafka
> > clients.
> >
> >
> > 2014-06-24 22:21 GMT+04:00 Neha Narkhede <neha.narkhede@gmail.com>:
> >
> > > Is it possible that maybe the zookeeper url used for the
> > > VerifyConsumerRebalance tool is incorrect?
> > >
> > >
> > > On Tue, Jun 24, 2014 at 12:02 AM, Yury Ruchin <yuri.ruchin@gmail.com>
> > > wrote:
> > >
> > > > Hi,
> > > >
> > > > I've run into the following problem. I try to read from a
> 50-partition
> > > > Kafka topic using high level consumer with 8 streams. I'm using
> > 8-thread
> > > > pool, each thread handling one stream. After a short time, the
> threads
> > > > reading from the stream stop reading. Lag between topic latest offset
> > and
> > > > the consumer constantly increases as new messages come in.
> > > >
> > > > I looked into ZK:  /consumers/<consumer_name>/owners/<topic_name>
and
> > > see a
> > > > list of znodes corresponding to the full list of partitions: [1, 2,
> 3,
> > > > ...]. When I do zk get on e. g.
> > > > /consumers/<consumer_name>/owners/<topic_name>/1 - I see a
valid
> > consumer
> > > > name corresponding to Kafka client logs, e. g.
> > > > <consumer_name>_<node_name>-1403049600000-abc12345-0. However,
when I
> > run
> > > > the VerifyConsumerRebalance tool, I see the following:
> > > >
> > > > No owner for partition [<topic_name>,1]
> > > > (kafka.tools.VerifyConsumerRebalance$)
> > > >
> > > > No owner for partition [<topic_name>,2]
> > > > (kafka.tools.VerifyConsumerRebalance$)
> > > >
> > > > ...
> > > >
> > > > No owner for partition [<topic_name>,50]
> > > > (kafka.tools.VerifyConsumerRebalance$)
> > > >
> > > > According to this output, no partition has owner, which seemingly
> > > > contradicts to what I see in ZK.
> > > >
> > > > What would cause such a problem and how can I troubleshoot it
> further?
> > > >
> > > > Thanks!
> > > >
> > >
> >
>

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