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
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@@ -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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