Hi,

On 7 Nov 2019, at 09:18, SenthilKumar K <senthilec566@gmail.com> wrote:

Hello Experts ,  We are observing issues in Partition(s) when the Kafka broker is down & the Partition Leader Broker ID set to -1.

Kafka Version 2.2.0 

Total No Of Brokers: 24

Total No Of Partitions: 48

Replication Factor: 2

Min In sync Replicas: 1

Partition                                             Leader         Replicas           In Sync Replicas

See above the Partition 41 leader set to -1 ,  the replicas exist in 18,24. The broker id 24 went down for due to Too many open files. 

Q: Why is it not electing the broker 18 as a leader for Partition 41?

Had a similar problem in Past, after fixing the broker the partition shows correct leader. 

Kafka Properties:

default.replication.factor = 2

unclean.leader.election.enable = true

min.insync.replicas = 1

num.partitions = 48

Zookeeper Active Broker ID's:

[zk: localhost:2181(CONNECTED) 1] ls /kafka.test/brokers/ids

[1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 3, 4, 5, 6, 7, 8, 9]

[zk: localhost:2181(CONNECTED) 2] 

Restarting ZK also didn't help.

Pls advise! How to fix this? Why is this happening?

Your attachment image didn’t come through. Also, not sure what’s your ID assignment strategy is, Keeping Broker iD 0 has caused some problems for me in the past. With ID >=1 I haven’t had any issue as such.

Also, you mentioned you “Fixed the broker” in the past. What exactly did you fix?

Regards,