[jira] [Created] (MESOS-7656) Update the JSON <=> protobuf message conversion for map support

["Qian Zhang (JIRA)" <ji...@apache.org>]

Qian Zhang created MESOS-7656:
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             Summary: Update the JSON <=> protobuf message conversion for map support
                 Key: MESOS-7656
                 URL: https://issues.apache.org/jira/browse/MESOS-7656
             Project: Mesos
          Issue Type: Improvement
            Reporter: Qian Zhang
            Assignee: Qian Zhang


[Map|https://developers.google.com/protocol-buffers/docs/proto#maps] is a feature starting from proto2 syntax, but it can only be compiled with proto3 compiler, see the following discussion for details:
https://groups.google.com/forum/#\!topic/protobuf/p4WxcplrlA4
We have already upgraded the protobuf compiler from 2.6.1 to 3.3.0 in [MESOS-7228|https://issues.apache.org/jira/browse/MESOS-7228], however, to use protobuf map in Mesos code, we also need to add the protobuf map support to the code in Mesos for converting protobuf message to JSON object and parsing JSON object as protobuf message, that is what we plan to handle in this ticket.

With map support added, the following field in the protobuf message can be replaced by the native protobuf map field, and we do not have to manually parse it anymore.
https://github.com/apache/mesos/blob/1.3.0/include/mesos/docker/v1.proto#L68



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