Lucas Bradstreet created KAFKA-8125:
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Summary: Check for topic existence in CreateTopicsRequest prior to
creating replica assignment
Key: KAFKA-8125
URL: https://issues.apache.org/jira/browse/KAFKA-8125
Project: Kafka
Issue Type: Improvement
Components: core
Affects Versions: 2.1.1
Reporter: Lucas Bradstreet
Imagine the following pattern to ensure topic creation in an application:
# Attempt to create a topic with # partitions P and replication factor R.
# If topic creation fails with TopicExistsException, continue. If topic
creation succeeds, continue, the topic now exists.
This normally works fine. However, if the topic has already been created, but
if the number of live brokers < R, then the topic creation will fail an
org.apache.kafka.common.errors.InvalidReplicationFactorException, even though
the topic already exists.
This could be avoided if we check whether the topic exists prior to calling
AdminUtils.assignReplicasToBrokers.
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