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| -rw-r--r-- | kafka/howto_rebalance.md | 29 |
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diff --git a/kafka/howto_rebalance.md b/kafka/howto_rebalance.md new file mode 100644 index 0000000..06ae507 --- /dev/null +++ b/kafka/howto_rebalance.md @@ -0,0 +1,29 @@ + +## Rebalance Storage Between Brokers + +For example, after adding or removing brokers from the cluster. + +Create a list of topics to move, and put it in `/tmp/topics_to_move.json`: + + { + "version": 1, + "topics": [ + {"topic": "sandcrawler-shadow.grobid-output"}, + {"topic": "fatcat-prod.api-crossref"} + ] + } + +On a kafka broker, go to `/srv/kafka-broker/kafka-*/bin`, generate a plan, then +inspect the output: + + ./kafka-reassign-partitions.sh --zookeeper localhost:2181 --broker-list "280,281,284,285,263" --topics-to-move-json-file /tmp/topics_to_move.json --generate > /tmp/reassignment-plan.json + cat /tmp/reassignment-plan.json | rg '^\{' | tail -n1 > /tmp/new-plan.json + cat /tmp/reassignment-plan.json | rg '^\{' | jq . + +If that looks good, start the rebalance: + + ./kafka-reassign-partitions.sh --zookeeper localhost:2181 --reassignment-json-file /tmp/new-plan.json --execute + +Then monitor progress: + + ./kafka-reassign-partitions.sh --zookeeper localhost:2181 --reassignment-json-file /tmp/new-plan.json --verify |