turboFei edited a comment on issue #24533: [SPARK-27637] For nettyBlockTransferService, when exception occurred when fetching data, check whether relative executor is alive before retry URL: https://github.com/apache/spark/pull/24533#issuecomment-489541964 > does this account for the cases when external shuffle service is enabled? This executorAliveChecker is only implemented in nettyBlockTransferService. When external shuffle service is enabled, nettyBlockTransferService is used to fetch broadcast block data and externalShuffleClient is used to fetch shuffle block data. Therefore, this account for fetching broadcast block when external shuffle service is enabled. When external shuffle service is not enabled, this account for fetching both shuffle block data and broadcast data. @felixcheung
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