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https://issues.apache.org/jira/browse/FLINK-16030?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17323093#comment-17323093
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Flink Jira Bot commented on FLINK-16030:
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This issue is assigned but has not received an update in 7 days so it has been
labeled "stale-assigned". If you are still working on the issue, please give an
update and remove the label. If you are no longer working on the issue, please
unassign so someone else may work on it. In 7 days the issue will be
automatically unassigned.
> Add heartbeat between netty server and client to detect long connection alive
> -----------------------------------------------------------------------------
>
> Key: FLINK-16030
> URL: https://issues.apache.org/jira/browse/FLINK-16030
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Network
> Affects Versions: 1.7.2, 1.8.3, 1.9.2, 1.10.0
> Reporter: begginghard
> Assignee: begginghard
> Priority: Major
> Labels: stale-assigned
>
> As reported on [the user mailing
> list|https://lists.apache.org/[email protected]:lte=1M:Encountered%20error%20while%20consuming%20partitions]
> Network can fail in many ways, sometimes pretty subtle (e.g. high ratio
> packet loss).
> When the long tcp connection between netty client and server is lost, the
> server would failed to send response to the client, then shut down the
> channel. At the same time, the netty client does not know that the connection
> has been disconnected, so it has been waiting for two hours.
> To detect the long tcp connection alive on netty client and server, we should
> have two ways: tcp keepalive and heartbeat.
>
> The tcp keepalive is 2 hours by default. When the long tcp connection dead,
> you continue to wait for 2 hours, the netty client will trigger exception and
> enter failover recovery.
> If you want to detect quickly, netty provides IdleStateHandler which it use
> ping-pang mechanism. If netty client sends continuously n ping message and
> receives no one pang message, then trigger exception.
>
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