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Re: Questions on kafka leader selection
Hi Jun,

Thanks for the reply.

But this case arises one more questions that, If all the 3 down brokers are
crashed and we have added
some new brokers, is there any way to re-balance those replicas to make
partition available? OR any tool to balance the number of replicas if any
one of the ISR goes down but the controller active? As this helps to make
high data availability.

Thanks,

Yogesh Sangvikar
On Wed, Jun 19, 2013 at 8:53 PM, Jun Rao <[EMAIL PROTECTED]> wrote:

> If leader is -1, that indicates the partition is unavailable. Were replicas
> 4,2,3 all down at that time? If so, you need to start at least one of those
> brokers to make the partition available again.
>
> Thanks,
>
> Jun
>
>
> On Wed, Jun 19, 2013 at 5:05 AM, Yogesh Sangvikar <
> [EMAIL PROTECTED]> wrote:
>
> > Hi Team,
> >
> > Please help to understand following questing as we are planning to use
> > kafka 0.8 in our production,
> > 1. We found the 'leader: -1' state, when the leader selection will happen
> > for such partitions? Does the partition data will be unavailable till
> that
> > time?
> >
> > example:
> > topic: test1    partition: 0    leader: -1      replicas: 4,2,3 isr:
> > topic: test1    partition: 1    leader: 0       replicas: 0,3,4 isr: 0,4
> > topic: test1    partition: 2    leader: 1       replicas: 1,4,0 isr:
> 1,0,4
> >
> > 2. Do we need to restart the brokers to update the isr entries to remove
> > the unavailable brokers?
> >
> > Thanks,
> > Yogesh Sangvikar
> >
>