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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