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https://issues.apache.org/jira/browse/KAFKA-5319?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16024047#comment-16024047
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Ma Tianchi commented on KAFKA-5319:
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[~mih...@wp.pl]you are right,I am a green hand to use JIRA.I reopen it
> Add a tool to make cluster replica and leader balance
> -----------------------------------------------------
>
> Key: KAFKA-5319
> URL: https://issues.apache.org/jira/browse/KAFKA-5319
> Project: Kafka
> Issue Type: Improvement
> Components: admin
> Affects Versions: 0.10.2.1
> Reporter: Ma Tianchi
>
> When a new broker is added to cluster,there is not any topics in the new
> broker.When we use console command to create a topic without
> 'replicaAssignmentOpt',Kafka use AdminUtils.assignReplicasToBrokers to get
> replicaAssignment.Even though it is balance at the creating time if the
> cluster never change,with more and more brokers added to cluster the replica
> balanced will become not well. We also can use 'kafka-reassign-partitions.sh'
> to balance ,but the big amount of topics make it not easy.And at the topic
> created time , Kafka choose a PreferredReplicaLeader which be put at the
> first position of the AR to make leader balance.But the balance will be
> destroyed when cluster changed.Using 'kafka-reassign-partitions.sh' to make
> partition reassignment may be also destroy the leader balance ,because user
> can change the AR of the partition . It may be not balanced , but Kafka
> believe cluster leader balance is well with every leaders is the first on at
> AR.
> So we create a tool to make the number of replicas and number of leaders on
> every brokers is balanced.It uses a algorithm to get a balanced replica and
> leader reassignment,then uses ReassignPartitionsCommand to real balance the
> cluster.
> It can be used to make balance when cluster added brokers or cluster is not
> balanced .It does not deal with moving replicas of a dead broker to an alive
> broker,it only makes replicas and leaders on alive brokers is balanced.
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