Wenbing Shen created KAFKA-12556:
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Summary: Add --under-preferred-replica-partitions option to
describe topics command
Key: KAFKA-12556
URL: https://issues.apache.org/jira/browse/KAFKA-12556
Project: Kafka
Issue Type: Improvement
Components: tools
Reporter: Wenbing Shen
Whether the preferred replica is the partition leader directly affects the
external output traffic of the broker. When the preferred replica of all
partitions becomes the leader, the external output traffic of the broker will
be in a balanced state. When there are a large number of partition leaders that
are not preferred replicas, it will be destroyed this state of balance.
Currently, the controller will periodically check the unbalanced ratio of the
partition preferred replicas (if enabled) to trigger the preferred replica
election, or manually trigger the election through the kafka-leader-election
tool. However, if we want to know which partition leader is in the
non-preferred replica, we need to look it up in the controller log or judge
ourselves from the topic details list.
We can add the --under-preferred-replica-partitions configuration option in
TopicCommand describe topics to query the list of partitions in the current
cluster that are in non-preferred replicas.
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