Hi Andrew,
Thanks for the speedy reply, so do I just need to do this for partition 49?
What about partitions 0-48, will these be covered by reassigning partition 49.
Do I need to do this for the __transaction_state topics too?
Many thanks,
Chris
> On 16 Dec 2022, at 4:17 pm, Andrew Grant <agr...@confluent.io.invalid> wrote:
>
> Hey Chris,
> I think you should be able to use the reassignment tool to add replicas.
> You should be able to do something similar to migrate the partitions away
> from the old brokers and onto the new ones and also increase the
> replication factor at the same time. I tested just increasing the
> replication factor with the following commands:
>
> kafka % ./bin/kafka-topics.sh --bootstrap-server localhost:9092 --topic
> __consumer_offsets --describe | grep 'Partition: 49'
> Topic: __consumer_offsets Partition: 49 Leader: 1 Replicas: 1 Isr: 1
> Offline:
>
> kafka % cat reassignment.json
> {
> "version": 1,
> "partitions": [
> {
> "topic": "__consumer_offsets",
> "partition": 49,
> "replicas": [ 1, 0 ]
> }
> ]
> }
>
> kafka % ./bin/kafka-reassign-partitions.sh --bootstrap-server
> localhost:9092 --reassignment-json-file reassignment.json --execute
> Current partition replica assignment
>
> {"version":1,"partitions":[{"topic":"__consumer_offsets","partition":49,"replicas":[1],"log_dirs":["any"]}]}
>
> Save this to use as the --reassignment-json-file option during rollback
> Successfully started partition reassignment for __consumer_offsets-49
> kafka % ./bin/kafka-topics.sh --bootstrap-server localhost:9092 --topic
> __consumer_offsets --describe | grep 'Partition: 49'
> Topic: __consumer_offsets Partition: 49 Leader: 1 Replicas: 1,0 Isr: 1,0
> Offline:
>
>
> Andrew
>
>
>> On Fri, Dec 16, 2022 at 9:46 AM Chris Peart <ch...@peart.me.uk> wrote:
>>
>>
>>
>> Hi,
>>
>> We have a kafka production cluster that was setup with the defaults for
>> __consumer_offsets & __transaction_state topics.
>>
>> Is there a way to increase the replication factor from 1 to 3 using the
>> kafka-reassign-partitions tool?
>>
>> We are also replacing our 4 brokers with new brokers, this has been
>> completed so we now have an 8 broker cluster and have migrated all the
>> topics to the new brokers using the reassign tool except for the
>> __consumer_offsets & __transaction_state topics.
>>
>> We stopped kafka on the old brokers today but all out consumers failed
>> due to the __consumer_offsets & __transaction_state topics residing on
>> the old brokers.
>>
>> I'm thinking we should could move the __consumer_offsets &
>> __transaction_state topics to the now brokers using the reassign tool, i
>> have done this on our dev platform and all is good. If you think this is
>> good idea we can then can stop kafka on the old nodes and then work on
>> the replication factoron the new nodes?
>>
>> The problem i have is how do we change the replication factor to 3 after
>> we migrate the __consumer_offsets & __transaction_state topics?
>>
>> Thanks in advance.
>>
>> Chris
