https://bz.apache.org/bugzilla/show_bug.cgi?id=62515
Bug ID: 62515
Summary: Tomcat should perform a graceful shutdown
Product: Tomcat 8
Version: 8.0.x-trunk
Hardware: PC
Status: NEW
Severity: enhancement
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: k...@semler.dk
Target Milestone: ----
Tomcat does not shutdown as other Java servers do.
Usual java server shutdown practice:
1. Stop listening on inbound port
2. Finish executing all existing requests based on X timeout
3. Shutdown server
Tomcat does this:
1. Finish executing all existing requests based on unloaddelay timeout
2. Stop listening on inbound port
3. Shutdown server
Due to tomcat still listening on inbound port it will accept requests to the
end, which are then terminated, as they do not have sufficient time to finish,
regardless of the value set for unloaddelay attribute.
Furthermore, it is impossible for any loadbalancer, reverse proxy, etc upstream
to know that the tomcat is shutting down. For other java servers, because the
inbound port is closed, the upstream cannot connect and behaves according to
its purpose & configuration (for example send new requests to another server).
So in conclusion, by stopping the inbound port first thing, we can ensure
existing request completing successfully as well as allowing upstream
components to know that the server is not available for new requests.
To produce this problem, you need a simple servlet with a long response time.
Invoke it, request shutdown of server, invoke it again.
Depending on unloaddelay value, either both requests will fail or the last
request will fail.
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