Jacek Sieka 3f8764ee61
fix replays stalling processing (#2361)
* fix replays stalling processing

Occasionally, attestations will arrive that vote for a target derived
either from the finalized block or earlier. In these cases, Nimbus would
replay the state transition of up to 32 epochs worth of blocks because
the finalized state has been pruned, delaying other processing and
leading to poor inclusion distance.

* put cheap attestation checks before forming EpochRef
* check that attestation target is not from an unviable history with
regards to finalization
* fix overly aggressive state pruning removing the state close to the
finalized checkpoint resulting in rare long replays for valid
attestations
* log long replays
* harden logging and traversal of nil BlockSlot

* simplify target check

no need to lookup target in chain dag again

* fixup

* fixup
2021-03-01 20:50:43 +01:00
..
2020-11-20 11:00:22 +01:00
2020-06-03 15:52:02 +02:00
2020-09-21 18:02:27 +02:00