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From "Yu, Libo " <libo...@citi.com>
Subject RE: issue with kafka-preferred-replica-election.sh
Date Wed, 21 Aug 2013 14:25:25 GMT
For the path /brokers/topics/my_topic/partitions, if you remove partitions and run
kafka-preferred-replica-election.sh, it terminates right away with keeper exception.

Regards,

Libo


-----Original Message-----
From: Guozhang Wang [mailto:wangguoz@gmail.com] 
Sent: Wednesday, August 21, 2013 12:23 AM
To: users@kafka.apache.org
Subject: Re: issue with kafka-preferred-replica-election.sh

Libo,

Sorry for the late reply. I will file a JIRA for this one. Could you please provide the full
process and environment to reproduce this issue?

Guozhang


On Tue, Aug 20, 2013 at 1:10 PM, Yu, Libo <libo.yu@citi.com> wrote:

> Hi Guozhang,
>
> Thanks for the detailed reply. All the brokers are running.
> The path not created is /brokers/topics/uattoqaaa.default/partitions
> not /brokers/topics/uattoqaaa.default/partitions/[partition-id]/state
> Actually, I found quite a few topics don't have the issue. The 
> controller must have failed to create them. I will keep monitoring this issue.
>
> Currently, when /brokers/topics/my_path/partitions is not there, 
> kafka-preferred-replica-election.sh stops right away with nonode 
> keeper exception. Could you file a JIRA to make it keep working in 
> that scenario?
>
>
>
> Regards,
>
> Libo
>
>
> -----Original Message-----
> From: Guozhang Wang [mailto:wangguoz@gmail.com]
> Sent: Tuesday, August 20, 2013 3:56 PM
> To: users@kafka.apache.org
> Subject: Re: issue with kafka-preferred-replica-election.sh
>
> The create command tool will only create the path 
> /brokers/topics/uattoqaaa.default, and then controller, once noticing 
> the change in ZK about the added topic, will elect leaders from the 
> assigned replicas written in /brokers/topics/uattoqaaa.default and 
> then create /brokers/topics/uattoqaaa.default/partitions/[partition-id]/state.
>
> If you have created the topic for a long time but 
> /brokers/topics/uattoqaaa.default/partitions/[partition-id]/state is 
> not created by controller, it could because the replicas specified in 
> /brokers/topics/uattoqaaa.default does not exist yet. Could you verify 
> the brokers specified in this path are up and running?
>
> Guozhang
>
>
> On Tue, Aug 20, 2013 at 12:14 PM, Yu, Libo <libo.yu@citi.com> wrote:
>
> > One more question:
> > "The create topic command will not immediately create the path; it 
> > will be created by the controller later during the creation of 
> > partitions and assign replicas to partitions."
> >
> > So when will the controller create the path and partitions? When the 
> > first message is published to the topic and partition?
> > All the partitions are created at once?
> >
> > Regards,
> >
> > Libo
> >
> >
> > -----Original Message-----
> > From: Guozhang Wang [mailto:wangguoz@gmail.com]
> > Sent: Tuesday, August 20, 2013 1:48 PM
> > To: users@kafka.apache.org
> > Subject: Re: issue with kafka-preferred-replica-election.sh
> >
> > Could you check that before you run
> > kafka-preferred-replica-election.sh
> > the /brokers/topics/uattoqaaa.default/partitions Node has been 
> > created or not?
> > The create topic command will not immediately create the path; it 
> > will be created by the controller later during the creation of 
> > partitions and assign replicas to partitions. If you start the 
> > election command right after the create topic tool, it might not be created yet.
> >
> > Guozhang
> >
> >
> > On Tue, Aug 20, 2013 at 10:24 AM, Yu, Libo <libo.yu@citi.com> wrote:
> >
> > > It is created with 3 partitions.
> > >
> > > Regards,
> > >
> > > Libo
> > >
> > >
> > > -----Original Message-----
> > > From: Guozhang Wang [mailto:wangguoz@gmail.com]
> > > Sent: Tuesday, August 20, 2013 12:21 PM
> > > To: users@kafka.apache.org
> > > Subject: Re: issue with kafka-preferred-replica-election.sh
> > >
> > > Hello Libo,
> > >
> > > Before you call the kafka-preferred-replica-election.sh have you 
> > > already created the topic uattoqaaa.default with the number of
> > partitions?
> > >
> > > Guozhang
> > >
> > >
> > > On Tue, Aug 20, 2013 at 8:35 AM, Yu, Libo <libo.yu@citi.com> wrote:
> > >
> > > > Hi,
> > > >
> > > > I tried to run kafka-preferred-replica-election.sh on our kafka
> > cluster.
> > > > But I got this expection:
> > > > Failed to start preferred replica election
> > > > org.I0Itec.zkclient.exception.ZkNoNodeException:
> > > > org.apache.zookeeper.KeeperException$NoNodeException:
> > > > KeeperErrorCode = NoNode for
> > > > /brokers/topics/uattoqaaa.default/partitions
> > > >
> > > > I checked zookeeper and there is no 
> > > > /brokers/topics/uattoqaaa.default/partitions. All I found is 
> > > > /brokers/topics/uattoqaaa.default.
> > > >
> > > > I believe this is a bug and I am not sure if there is a JIRA for it.
> > > > Could you confirm? Thanks.
> > > >
> > > > Regards,
> > > >
> > > > Libo
> > > >
> > > >
> > >
> > >
> > > --
> > > -- Guozhang
> > >
> >
> >
> >
> > --
> > -- Guozhang
> >
>
>
>
> --
> -- Guozhang
>



--
-- Guozhang

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