cumulus: ParachainBlockData
support multiple blocks
#6137
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This pull request adds support to
ParachainBlockData
to support multiple blocks at once. This basically means that cumulus based Parachains could start packaging multiple blocks into onePoV
. From the relay chain POV nothing changes and thesePoV
s appear like any otherPoV
. Internally thisPoV
then executes the blocks sequentially. However, all these blocks together can use the same amount of resources like a singlePoV
. This pull request is basically a preparation to support running parachains with a faster block time than the relay chain.This breaks the encoding of
ParachainBlockData
. It requires that the collators upgrade first before the runtime requiring the newParachainBlockData
is enacted. The collators will decide based on the api version ofCollectCollationInfo
, whichParachainBlockData
format they will send to the relay chain so that the validation code can interpret it correctly.