Hi,
We are having a issue with our kafka cluster when we try to reassign
partitions. Imagine the following topic layout file:
Kafka Version: 0.8.2
{
"partitions": [
{
"partition": 0,
"replicas": [
1,
2,
3
],
"topic": "mytopic"
},
],
"version": 1
}
And imagine we want to change replicas broker ids 2 and 3 to 4 and 5.
After changing it, the final layout would be:
{
"partitions": [
{
"partition": 0,
"replicas": [
5,
1,
4
],
"topic": "mytopic"
},
],
"version": 1
}
After running
./bin/kafka-reassign-partitions.sh --zookeeper $zookeeper
--reassignment-json-file /tmp/mytopic --execute we got the error
*ERROR: Assigned replicas (*1*,*2*,*3*,*4*,*5*) don't match the list of
replicas for reassignment (*5,1,4)* for partition [*mytopic*,0]*
It failed and its behavior is really strange:
* It increased the replication factor to 5 instead of keeping 3 having
a replica list [1, 2, 3, 4, 5] and ISR (514)
* Number 4 became the new leader (which is ok)
* The in-sync replica only has 3 ISRs instead of 5
* When we tried to restart the node 1, we lost it. It started
smoothly, but it could rejoin the cluster and it stopped appearing
on ISR list
Questions:
1) Why it increased the replica list?
2) Any ideas of how to investigate the problem?
