Neither. Sorry for the lack of clarity. What I want is an API so that the
following is added:
Runtime.getRuntime().addShutdownHook(new Thread() {
public void run() {
tezClient.stop();
}
});
This would just be sugar. It could be a configuration setting IMHO or just
a call like:
tezClient.stopOnJvmShutdown();
It just may be desirable if a single JVM is responsible for it's own
session. My application is a single JVM that reuses the same session, but
no other JVM has access to that session.
On Mon, Aug 11, 2014 at 2:22 PM, Hitesh Shah <[email protected]> wrote:
> Hi Thad,
>
> To clarify, are you looking for an API in the client to invoke a callback
> when a session has shut down? Or invoke user logic in the AM when the
> session is about to shut down?
>
> For the former, given that client does not poll the session continuously,
> detecting the session shutdown is only done when an API is invoked that
> requires the client to communicate with the AM. In such cases, a
> SessionNotRunning exception should be thrown. If you are looking at
> maintaining a live session handle all the time, one approach maybe to
> launch a thread that periodically invokes getAppMasterStatus and handle
> cases when the session has died.
>
> For the latter, there is no such support today.
>
> — Hitesh
>
>
> On Aug 11, 2014, at 11:14 AM, Bikas Saha <[email protected]> wrote:
>
> > This tracks it https://issues.apache.org/jira/browse/TEZ-1191
> >
> > From: Thaddeus Diamond [mailto:[email protected]]
> > Sent: Monday, August 11, 2014 9:03 AM
> > To: [email protected]
> > Subject: Application Shutdown
> >
> > Hey,
> >
> > Is there a way to trap a Tez session shutdown on JVM shutdown? The best
> I can think of is some manual shutdown hook like
> http://stackoverflow.com/questions/2921945/useful-example-of-a-shutdown-hook-in-java,
> but it would be nice to be able to say:
> >
> > TezClient tezSession = new TezClient(...);
> > tezSession.shutdownOnJvmExit();
> > tezSession.start();
> >
> > Or some TezConfiguration setting.
> >
> > Is there something like this? Should I file a JIRA?
> >
> > - Thad
> >
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