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Details
The MetadataImage has a lot of stuff in it and it gets passed around in many places in the new GroupCoordinator. This makes it difficult to understand what metadata the group coordinator actually relies on and makes it too easy to use metadata in ways it wasn't meant to be used. This change encapsulate the MetadataImage in an interface (`CoordinatorMetadataImage`) that indicates and controls what metadata the group coordinator actually uses. Now it is much easier at a glance to see what dependencies the GroupCoordinator has on the metadata. Also, now we have a level of indirection that allows more flexibility in how the GroupCoordinator is provided the metadata it needs. |
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