cloud-fan commented on issue #25971: [SPARK-29298][CORE] Separate block manager 
heartbeat endpoint from driver endpoint
URL: https://github.com/apache/spark/pull/25971#issuecomment-552061963
 
 
   by default Spark RPC will timeout after 120 seconds
   ```
   /** Returns the default Spark timeout to use for RPC ask operations. */
     def askRpcTimeout(conf: SparkConf): RpcTimeout = {
       RpcTimeout(conf, Seq(RPC_ASK_TIMEOUT.key, NETWORK_TIMEOUT.key), "120s")
     }
   ```
   
   IIUC, non-heartbeat timeout just fail the task/job, while heartbeat timeout 
causes executor lost, which is more serious

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