LantaoJin commented on issue #25971: [SPARK-29298][CORE] Separate block manager 
heartbeat endpoint from driver endpoint
URL: https://github.com/apache/spark/pull/25971#issuecomment-548630364
 
 
   
https://github.com/apache/spark/blob/0da667d31436c43e06cb6bb5ac65a17f65edd08b/core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala#issuecomment-548545864
 Yes. In a heavy cluster, it will timeout and cause block manager re-register 
unexpected. So that’s what the PR to fix, not just increase the timeout value. 
This code still keep `syncAsk` with 10 minutes timeout. Instead, the response 
from new heartbeat endpoint is fast even when the driver is heavy since the 
logic in heartbeat endpoint is light.

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