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https://issues.apache.org/jira/browse/FLINK-4326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15417255#comment-15417255
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Ismaël Mejía commented on FLINK-4326:
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A separation of (daemon/console) scripts would be the nicest, no doubt.
However, I am not sure if removing the PID code + output will be appropriate
when we run daemons and foreground processes at the same time, how do we count
the running instances if somebody runs a new process in foreground mode, or
what would be the logic if we call stop-all, must we kill all the processes
even the foreground ones ? in these cases I think we need the PID/output refs,
but well I am not really sure and maybe we can do such things without it.
Independent of this we must also not forget that we should preserve at least
the same options (start|stop|stop-all) for both jobmanager.sh and taskmanager.
because they do their magic (build the runtime options) and at the end they
call the the (daemon/console) script. I suppose we will need the new
start-foreground option in these scripts too, or are there any other ideas of
how to do it best ?
> Flink start-up scripts should optionally start services on the foreground
> -------------------------------------------------------------------------
>
> Key: FLINK-4326
> URL: https://issues.apache.org/jira/browse/FLINK-4326
> Project: Flink
> Issue Type: Improvement
> Components: Startup Shell Scripts
> Affects Versions: 1.0.3
> Reporter: Elias Levy
>
> This has previously been mentioned in the mailing list, but has not been
> addressed. Flink start-up scripts start the job and task managers in the
> background. This makes it difficult to integrate Flink with most processes
> supervisory tools and init systems, including Docker. One can get around
> this via hacking the scripts or manually starting the right classes via Java,
> but it is a brittle solution.
> In addition to starting the daemons in the foreground, the start up scripts
> should use exec instead of running the commends, so as to avoid forks. Many
> supervisory tools assume the PID of the process to be monitored is that of
> the process it first executes, and fork chains make it difficult for the
> supervisor to figure out what process to monitor. Specifically,
> jobmanager.sh and taskmanager.sh should exec flink-daemon.sh, and
> flink-daemon.sh should exec java.
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