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guide: remove refences to outdated secondary checkers (#6309)

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* guide: remove refences to outdated secondary checkers

* Update roadmap/implementers-guide/src/glossary.md

* guide: remove refences to Fisherman

* revert changes to roadmap/parachains.md
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ordian
2022-11-30 13:28:35 +01:00
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polkadot/roadmap/implementers-guide/src/node/availability/README.md
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# Availability Subsystems
The availability subsystems are responsible for ensuring that Proofs of Validity of backed candidates are widely available within the validator set, without requiring every node to retain a full copy. They accomplish this by broadly distributing erasure-coded chunks of the PoV, keeping track of which validator has which chunk by means of signed bitfields. They are also responsible for reassembling a complete PoV when required, e.g. when a fisherman reports a potentially invalid block.
The availability subsystems are responsible for ensuring that Proofs of Validity of backed candidates are widely available within the validator set, without requiring every node to retain a full copy. They accomplish this by broadly distributing erasure-coded chunks of the PoV, keeping track of which validator has which chunk by means of signed bitfields. They are also responsible for reassembling a complete PoV when required, e.g. when an approval checker needs to validate a parachain block.