weijietong opened a new pull request #2000: DRILL-7607: support dynamic credit based flow control URL: https://github.com/apache/drill/pull/2000 # [DRILL-7607](https://issues.apache.org/jira/browse/DRILL-7607): support dynamic credit based flow control ## Description change the static credit based flow control to dynamic credit based flow control. The logic is as below: Initially, the sender sends the batch according to the initial static sender semaphore. After the receiver receives enough data ,it calculates the runtime credit value , sends the runtime credit value to the sender as the ACK response. Then the sender receives this runtime credit value, changes to this runtime credit value from the initial credit value. The runtime generated credit value will only be generated one time. It will not be changed again to make the flow control logic simple. The ACK response credit value has three type numeric value with different meaning: -1 : meaning ACK for a fail response 0 : no runtime credit value to suggest to the sender , the sender still sends its data as its initial static credit value(current: 3) value > 0 : meaning a suggested runtime credit value from the receiver. ## Documentation NO ## Testing TestBitRpc,testConnectionBackpressure
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