Custom partition assignment and migration kafka集群扩充迁移指定partition

The partition reassignment tool can also be used to selectively move replicas of a partition to a specific set of brokers. When used in this manner, it is assumed that the user knows the reassignment plan and does not require the tool to generate a candidate reassignment, effectively skipping the --generate step and moving straight to the --execute step

For instance, the following example moves partition 0 of topic foo1 to brokers 5,6 and partition 1 of topic foo2 to brokers 2,3:

The first step is to hand craft the custom reassignment plan in a json file:

1 2	> cat custom-reassignment.json {"version":1,"partitions":[{"topic":"foo1","partition":0,"replicas":[5,6]},{"topic":"foo2","partition":1,"replicas":[2,3]}]}

Then, use the json file with the --execute option to start the reassignment process:

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> bin/kafka-reassign-partitions.sh --zookeeper localhost:2181 --reassignment-json-file custom-reassignment.json --execute Current partition replica assignment   {"version":1, "partitions":[{"topic":"foo1","partition":0,"replicas":[1,2]},               {"topic":"foo2","partition":1,"replicas":[3,4]}] }   Save this to use as the --reassignment-json-file option during rollback Successfully started reassignment of partitions {"version":1, "partitions":[{"topic":"foo1","partition":0,"replicas":[5,6]},               {"topic":"foo2","partition":1,"replicas":[2,3]}] }

The --verify option can be used with the tool to check the status of the partition reassignment. Note that the same expand-cluster-reassignment.json (used with the --execute option) should be used with the --verify option:

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> bin/kafka-reassign-partitions.sh --zookeeper localhost:2181 --reassignment-json-file custom-reassignment.json --verify Status of partition reassignment: Reassignment of partition [foo1,0] completed successfully Reassignment of partition [foo2,1] completed successfully