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https://issues.apache.org/jira/browse/FLINK-16030?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17036811#comment-17036811
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Yingjie Cao commented on FLINK-16030:
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I also ever encountered this problem (though just once), in my case, the netty
exception handler was called and from the log I can see the reason was write
timeout and it did not trigger any further failure like job failover. Just for
your information.
> 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
> Priority: Major
>
> 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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