dedups shreds by common-header instead of the entire payload #4187
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Shreds in the retransmit stage:
* don't have repair nonce (repaired shreds are not retransmitted).
* are already resigned by this node as the retransmitter.
* have their leader's signature verified.
Therefore in order to dedup shreds, it suffices to compare:
(signature, slot, shred-index, shred-type)
Because ShredCommonHeader already includes all of the above tuple,
the rest of the payload can be skipped.
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Problem
Shreds in the retransmit stage:
Therefore in order to dedup shreds, it suffices to compare:
Because
ShredCommonHeaderalready includes all of the above tuple, the rest of the payload can be skipped.Summary of Changes
The commit dedups shreds by common-header and skips the rest of the payload.