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From Jun Rao <jun...@gmail.com>
Subject Re: Kafka rolling upgrade
Date Fri, 05 Jul 2013 04:08:09 GMT
Kafka 0.8 is not backward compatible with 0.7. So you can't do inplace
upgrade. We do have a migration tool. See
https://cwiki.apache.org/confluence/display/KAFKA/Migrating+from+0.7+to+0.8

Thanks,

Jun


On Thu, Jul 4, 2013 at 7:53 PM, Hanish Bansal <
hanish.bansal.agarwal@gmail.com> wrote:

>  Hi All,
>
> I am using *Kafka-0.7.2 *in distributed mode.
>
> Now i want to upgrade Kafka version to recent stable release-*0.8 Beta
> *with
> rolling upgrade without * *any downtime.
>
> I tried to upgrade one kafka node but after starting that node i am getting
> Null Pointer Exception. This may be due *data format mismatch between both
> release*.
>
> My main purpose is to upgrade Kafka without shutting down whole cluster.
>
> I want to know if on one machine i upgrade Kafka and add that node to same
> running cluster while on another machines old Kafka version are running.
> Will it create any problem?
>
> If i upgrade whole cluster to new Kafka version then will it be consistent
> with previous data ?
>
> --
> *Thanks & Regards*
> *Hanish Bansal*
>

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