[jira] [Created] (MESOS-4916) Allow modules to express if they are multi-instantiable and thread safe.

["Kapil Arya (JIRA)" <ji...@apache.org>]

Kapil Arya created MESOS-4916:
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             Summary: Allow modules to express if they are multi-instantiable and thread safe.
                 Key: MESOS-4916
                 URL: https://issues.apache.org/jira/browse/MESOS-4916
             Project: Mesos
          Issue Type: Task
            Reporter: Kapil Arya


A module might be instantiated multiple time (e.g., multiple schedulers in the same Java process instantiating an authenticator module) within the same process. The current mechanism doesn't provide a way through the module API to forbid multiple instantiations. It is up to the module to check and return error on prior instantiation.

Along similar lines, a module should be able to express thread-safety concerns. Typically, a module running in Master/Agent doesn't have to be concerned about thread safety if it uses libprocess API. However, we should investigate how it plays in the scheduler environment.



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