Why does temporal workflow design numTaskqueueWritePartitions and numTaskqueueReadPartitions?

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Can anyone explain why temporal need two paramters: numTaskqueueWritePartitions and numTaskqueueReadPartitions?

I think we use one parameters numTaskqueuePartitions for read and wirte which is enough.

temporal-workflow temporal
1 Answers

It is needed to support shrinking the number of partitions without losing tasks. Set numTaskqueueWritePartitions < numTaskqueueReadPartitions to drain the backlog from the partitions to be removed. After no messages are left in those partitions set numTaskqueueReadPartitions to the value of numTaskqueueWritePartitions.

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