[jira] [Created] (FLINK-21036) Consider removing automatic configuration fo number of slots from docker

[Shang Yuanchun (Jira)]

Chesnay Schepler created FLINK-21036:
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             Summary: Consider removing automatic configuration fo number of slots from docker
                 Key: FLINK-21036
                 URL: https://issues.apache.org/jira/browse/FLINK-21036
             Project: Flink
          Issue Type: Improvement
          Components: Deployment / Scripts
            Reporter: Chesnay Schepler
             Fix For: 1.13.0


The {{docker-entrypoint.sh}} supports setting the number of task slots via the {{TASK_MANAGER_NUMBER_OF_TASK_SLOTS}} environment variable, which defaults to the number of cpu cores via {{$(grep -c ^processor /proc/cpuinfo)}}.

The environment variable itself is redundant nowadays since we introduced {{FLINK_PROPERTIES}}, and is no longer documented.

Defaulting to the number of CPU cores can be considered convenience, but it seems odd to have this specific to docker while the distribution defaults to {{1}}.
The bigger issue in my mind though is that this creates a configuration mismatch between the Job- and TaskManager processes; the ResourceManager specifically needs to know how many slots a worker has to make decisions about redundancy and allocating resources.



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