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

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-9417?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated FLINK-9417:
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    Labels: pull-request-available  (was: )

> 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
>            Assignee: Sihua Zhou
>            Priority: Major
>              Labels: pull-request-available
>
> 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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