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The migration tool accepts exactly one of whitelist or blacklist. These are standard Java regex patterns.

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Blocking producer

In order to sustain a higher throughput, you would typically use an asynchronous embedded producer and it should be configured to be in blocking mode (i.e., queue.enqueueTimeout.ms=-1). This recommendation is to ensure that messages will not be lost. Otherwise, the default enqueue timeout of the asynchronous producer is zero which means if the producer's internal queue is full, then messages will be dropped due to QueueFullExceptions. A blocking producer however, will wait if the queue is full, and effectively throttle back the embedded consumer's consumption rate. You can enable trace logging in the producer to observe the remaining queue size over time. If the producer's queue is consistently full, it indicates that the migration tool is bottle-necked on re-publishing messages to the target cluster and/or flushing messages to disk.

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