[SPARK-40778] Make HeartbeatReceiver as an IsolatedRpcEndpoint - ASF JIRA

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Details

Type: Improvement
Status: Resolved
Priority: Minor
Resolution: Fixed
Affects Version/s: 3.3.0
Fix Version/s: 3.4.0
Component/s: Spark Core
Labels:
None

Description

All RpcEndpoint including HeartbeatReceiver in driver are sharing one thread pool. When there're lots of rpc messages queued, the waiting process time of heartbeat time could easily exceed heartbeat timeout. Make HeartbeatReceiver extends IsolatedRcpEndpoint then it has dedicated single thread to process heartbeat