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From Brian Chhun <brian.ch...@getbraintree.com>
Subject Re: Including option for starting job and task managers in the foreground
Date Wed, 02 Dec 2015 17:29:01 GMT
Yep, I think this makes sense. I'm currently patching the flink-daemon.sh
script to remove the `&`, but I don't think it's a very robust solution,
particularly when this script changes across versions of Flink. I'm very
new to Docker, but the resources I've found indicates that the process must
run in the foreground, though people seem to get around it with some hacks.

When I have some time, I can look into refactoring some parts of the
scripts so that it can be started in the foreground.


On Wed, Dec 2, 2015 at 3:22 AM, Maximilian Michels <mxm@apache.org> wrote:

> Hi Brian,
> I don't recall Docker requires commands to run in the foreground. Still,
> if that is your requirement, simply remove the "&" at the end of this line
> in flink-daemon.sh:
> $JAVA_RUN $JVM_ARGS ${FLINK_ENV_JAVA_OPTS} "${log_setting[@]}" -classpath
> ${CLASS_TO_RUN} "${ARGS[@]}" > "$out" 2>&1 < /dev/null &
> Cheers,
> Max
> On Wed, Dec 2, 2015 at 9:26 AM, Till Rohrmann <trohrmann@apache.org>
> wrote:
>> Hi Brian,
>> as far as I know this is at the moment not possible with our scripts.
>> However it should be relatively easy to add by simply executing the Java
>> command in flink-daemon.sh in the foreground. Do you want to add this?
>> Cheers,
>> Till
>> On Dec 1, 2015 9:40 PM, "Brian Chhun" <brian.chhun@getbraintree.com>
>> wrote:
>>> Hi All,
>>> Is it possible to include a command line flag for starting job and task
>>> managers in the foreground? Currently, `bin/jobmanager.sh` and
>>> `bin/taskmanager.sh` rely on `bin/flink-daemon.sh`, which starts these
>>> things in the background. I'd like to execute these commands inside a
>>> docker container, but it's expected that the process is running in the
>>> foreground. I think it might be useful to have it run in the foreground so
>>> that it can be hooked into some process supervisors. Any suggestions are
>>> appreciated.
>>> Thanks,
>>> Brian

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