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https://issues.apache.org/jira/browse/IGNITE-16462?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pavel Tupitsyn updated IGNITE-16462:
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Summary: .NET: Thin client: add keep-alive message to detect half-open
connections (was: Thin client: add keep-alive message to detect half-open
connections)
> .NET: Thin client: add keep-alive message to detect half-open connections
> -------------------------------------------------------------------------
>
> Key: IGNITE-16462
> URL: https://issues.apache.org/jira/browse/IGNITE-16462
> Project: Ignite
> Issue Type: Improvement
> Components: platforms, thin client
> Reporter: Pavel Tupitsyn
> Assignee: Pavel Tupitsyn
> Priority: Major
> Labels: iep-83
> Fix For: 2.13
>
>
> *Why*
> TCP connections can enter [half-open
> state|https://en.wikipedia.org/wiki/TCP_half-open]: seems to be alive, but
> any attempt to send data will fail. Long-living and mostly idle connections
> are especially susceptible to this behavior.
> Retry mechanism ([IEP-82 Thin Client Retry
> Policy|https://cwiki.apache.org/confluence/display/IGNITE/IEP-82+Thin+Client+Retry+Policy])
> in thin client implementations partially mitigates the issue. However, not
> all operations are safe to retry, and reconnect affects performance.
> To improve the connection stability and detect failures early we can add a
> keep-alive mechanism.
> *Why not TCP keepalive*
> TCP has a [built-in keepalive
> mechanism|https://en.wikipedia.org/wiki/Keepalive], but it has some
> disadvantages:
> * Optional (may be not present in some TCP stacks)
> * May be not handled well by some routers (RFC 1122, section 4.2.3.6)
> * Default timeout is too long (2 hours), and is problematic to adjust on SDK
> versions that are in use in Ignite (Java 8, .NET Standard 2.0), or hard to do
> right in some languages (Python, JS).
> Because of that, some protocols implement keepalive logic on a higher level
> (SMB, [TLS|https://datatracker.ietf.org/doc/html/rfc6520]). More details:
> https://blog.stephencleary.com/2009/05/detection-of-half-open-dropped.html
> *How*
> Add OP_HEARTBEAT to the protocol with an empty payload. Clients can send
> heartbeats at a configurable interval and receive responses to ensure that
> connection is active.
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