[jira] [Updated] (MESOS-7828) Current approach to parse protobuf enum from JSON does not support upgrades

["Vinod Kone (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MESOS-7828?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vinod Kone updated MESOS-7828:
------------------------------
    Sprint: Mesosphere Sprint 64, Mesosphere Sprint 65  (was: Mesosphere Sprint 64)

> Current approach to parse protobuf enum from JSON does not support upgrades
> ---------------------------------------------------------------------------
>
>                 Key: MESOS-7828
>                 URL: https://issues.apache.org/jira/browse/MESOS-7828
>             Project: Mesos
>          Issue Type: Bug
>            Reporter: Qian Zhang
>            Assignee: Qian Zhang
>
> To use protobuf enum in a backwards compatible way, [the suggestion on the protobuf mailing list|https://groups.google.com/forum/#!msg/protobuf/NhUjBfDyGmY/pf294zMi2bIJ] is to use optional enum fields and include an UNKNOWN value as the first entry in the enum list (and/or explicitly specifying it as the default). This can handle the case of parsing protobuf message from a serialized string, but it can not handle the case of parsing protobuf message from JSON.
> E.g., when I access master endpoint with an inexistent enum {{xxx}}, I will get an error:
> {code}
> $ curl -X POST -H "Content-Type: application/json" -d '{"type": "xxx"}' 127.0.0.1:5050/api/v1
> Failed to convert JSON into Call protobuf: Failed to find enum for 'xxx'% 
> {code}
> In the {{Call}} protobuf message, the enum {{Type}} already has a default value {{UNKNOWN}} (see [here|https://github.com/apache/mesos/blob/1.3.0/include/mesos/v1/master/master.proto#L45] for details) and the field {{Call.type}} is optional, but the above curl command will still fail. The root cause is, in the code [here|https://github.com/apache/mesos/blob/1.3.0/3rdparty/stout/include/stout/protobuf.hpp#L449:L454] when we try to get the enum value for the string "xxx", it will fail since there is no any enum value corresponding to "xxx".



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