[GitHub] [mesos] asekretenko commented on a change in pull request #326: MESOS-6874: Validate the match between Type and *Infos in the ContainerInfo.

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asekretenko commented on a change in pull request #326: MESOS-6874: Validate the match between Type and *Infos in the ContainerInfo.
URL: https://github.com/apache/mesos/pull/326#discussion_r264639836
 
 

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 File path: include/mesos/mesos.proto
 ##########
 @@ -3328,6 +3328,9 @@ message TTYInfo {
  */
 message ContainerInfo {
   // All container implementation types.
+  // For each type there should be a field in the ContainerInfo itself
+  // with exactly matching name in the lowercase.
 
 Review comment:
   Unfortunately, there are two problems with converting this external interface to `oneof`.
   - First, it would make the code that sets both `docker` and `mesos` silently do strange things (instead of failing). I cannot prove that there is no such code outside of Mesos.
   - Second, we will still need `ContainerInfo::Type` and thus the validation. There are a lot of tests that only do `set_type(Type::MESOS)` but set neither `docker` nor `mesos`. According to the comment above the `ContainerInfo` definition, this is a perfectly valid way to set up a `MESOS` container without a filesystem isolation. I would expect such code to also exist in production outside of Mesos itself.
   
   It would have been a right decision to use `oneof` when this interface was initially introduced (and do without the `type` field), but now it is too late:( 

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