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https://issues.apache.org/jira/browse/FLINK-4326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15417522#comment-15417522
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Elias Levy commented on FLINK-4326:
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That would be my expectation. Writing out the PID would be nice, but it is not
a requirement. Process management becomes the job of the supervisor process.
Log handling is different. Some supervisors can handle logs output to stdout,
some don't. So even when outputting logs to stdout, the process should still
be capable of outputting to other locations, like a log directory or to syslog.
> 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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