turboFei edited a comment on issue #24533: [SPARK-27637][Shuffle] For nettyBlockTransferService, if IOException occurred while fetching data, check whether relative executor is alive before retry URL: https://github.com/apache/spark/pull/24533#issuecomment-492185517 > when will we use the default null value? only in test? Yes, the default null value is only used in test. So, I think we don't need add safeguard when driverEndPointRef is null. > This is the code we want to test, we should not put it in the test... Get it, I wanted to prove that the retryingBlockFetch would not retry when the relative executor is dead. I have remove this part. @cloud-fan Thanks
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