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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