[Minor Doc Fix] Correct the default value of druid.server.http.gracefulShutdownTimeout

[zhangyue19921010]

Description

According to the code

druid/server/src/main/java/org/apache/druid/server/initialization/jetty/JettyServerModule.java

Line 365 in 94226f1

final long gracefulStop = config.getGracefulShutdownTimeout().toStandardDuration().getMillis();

druid/server/src/main/java/org/apache/druid/server/initialization/jetty/JettyServerModule.java

Line 366 in 94226f1

if (gracefulStop > 0) {

druid/server/src/main/java/org/apache/druid/server/initialization/jetty/JettyServerModule.java

Line 367 in 94226f1

server.setStopTimeout(gracefulStop);

The configuration druid.server.http.gracefulShutdownTimeout can only take effect when the user sets a value greater than zero. Otherwise this parameter will not be set, using the default value which is 30000 milliseconds(PT30S) coding in

https://github.com/eclipse/jetty.project/blob/jetty-9.4.34.v20201102/jetty-util/src/main/java/org/eclipse/jetty/util/component/AbstractLifeCycle.java#L53

---

This PR has:

• been self-reviewed.

Key changed/added classes in this PR

• index.md

[a2l007]

Thanks for the fix!

I guess if we indeed do want to support shutdown without waiting, we might need another config property to toggle setStopAtShutdown. But I doubt the need for such a config as druid.server.http.gracefulShutdownTimeout satisfies most of the usecases.

[zhangyue19921010]

@a2l007 Thanks for your review!

[jihoonson]

I guess if we indeed do want to support shutdown without waiting, we might need another config property to toggle setStopAtShutdown. But I doubt the need for such a config as druid.server.http.gracefulShutdownTimeout satisfies most of the usecases.

I agree. The current config seems enough.