[jira] [Created] (FLINK-9417) Send heartbeat requests from RPC endpoint's main thread

[Shang Yuanchun (Jira)]

Till Rohrmann created FLINK-9417:
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             Summary: Send heartbeat requests from RPC endpoint's main thread
                 Key: FLINK-9417
                 URL: https://issues.apache.org/jira/browse/FLINK-9417
             Project: Flink
          Issue Type: Improvement
          Components: Distributed Coordination
    Affects Versions: 1.5.0, 1.6.0
            Reporter: Till Rohrmann


Currently, we use the {{RpcService#scheduledExecutor}} to send heartbeat requests to remote targets. This has the problem that we still see heartbeats from this endpoint also if its main thread is currently blocked. Due to this, the heartbeat response cannot be processed and the remote target times out. On the remote side, this won't be noticed because it still receives the heartbeat requests.

A solution to this problem would be to send the heartbeat requests to the remote thread through the RPC endpoint's main thread. That way, also the heartbeats would be blocked if the main thread is blocked/busy.



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