how to increase open files on kafka cluster

[#1]

We have 10 kafka machines with kafka version - 1.X

this kafka cluster version is part of HDP version - 2.6.5

We noticed that under /var/log/kafka/server.log the following message

ERROR Error while accepting connection {kafka.network.Accetpr}
java.io.IOException: Too many open files

We saw also additionally

Broker 21 stopped fetcher for partition ...................... because they are in the failed log dir /kafka/kafka-logs {kafka.server.ReplicaManager}

and

WARN Received a PartitionLeaderEpoch assignment for an epoch < latestEpoch. this implies messages have arrived out of order. New: {epoch:0, offset:2227488}, Currnet: {epoch 2, offset:261} for Partition: cars-list-75 {kafka.server.epochLeaderEpocHFileCache}

so regarding to the issue -

ERROR Error while accepting connection {kafka.network.Accetpr}
java.io.IOException: Too many open files

how to increase the MAX open files , in order to avoid this issue

[#2]

@mike_bronson7 

 Kafka broker needs at least the following number of file descriptors to just track log segment files:

(number of partitions)*(partition size / segment size)

You can review the current limits configuration under:

cat /proc/<kafka_pid>/limits

If you want to change them, if you're using ambari console you can go to > Kafka > config > and search for "kafka_user_nofile_limit"

Finally, To see open file descriptors, run:

lsof -p KAFKA_BROKER_PID