Validators should validate blocks from secondary collators

[bkchr]

Currently it seem that validators only validate blocks from primary collators. This needs to be fixed, as you can use this to block other collators from producing blocks. Even if the primary collator is not sending any block at all, a secondary one doesn't get the chance to send a block.

More a Polkadot issue, but still good to keep it here.

[JoshOrndorff]

Dumb question: What makes a collator a Primary collator? Is it the individual validator that considers a collator Primary? Or do all validators agree which collator is the primary one?

[bkchr]

AFAIR the first one that connects.

But this system does not makes that much sense. In the future when we have some sort of bundling between collators and validators, it will make sense.

[bkchr]

Fixed by paritytech/polkadot#1353