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Notes:
- The replica movement will stop if either source or destination replica becomes offline due to log directory failure.
- The RequestHandlerThread or ReplicaFetcherThread needs to grab lock of the Replica instance in order to append data to the Replica. This prevents race condition while ReplicaMoveThread is swapping the Log in the source log directory with the log in the destination log directory.
- The log segments in topicPartition.move directory will be subject to log truncation, log retention and log cleaning in the same way as the log segments in the source log directory. But we may not do log cleaning on the topicPartition.move to simplify the implementation.