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  • null: no upgrade needed, run with latest formats
  • "in_place": prepare yourself for an upgrade of the rebalance user-metadata format and an in-place upgrade of RocksDB on-disk format
  • "roll_over": prepare yourself for an upgrade of the rebalance user-metadata format and an roll-over upgrade of RocksDB on-disk format
  • "roll_in": new instance that does not get any processing assigned yet; rebuilds RocksDB with new format

If we consider to include a fix for https://issues.apache.org/jira/browse/KAFKA-6054 in this KIP, to allow upgrading from 0.10.0 to 1.2, we need to allow two more values for config upgrade.mode:

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