--sync fast from genesis

[crystalin]

From substrate 0.9.26:

Using --sync fast (or fast-unsafe) from genesis creates this error:

Sep 27 03:33:30 mkaki alphanet[27237]: 2022-09-27 03:33:30 [🌗] 💔 Verification failed for block 0xeb46e3ddc8037d8a800466f3fb210027c5191d04c7d69abcfc4a0676fba684ca received from peer: 12D3KooWNtwcFhwfsTb14BiUX4jTHvDVY424nyDySYWMNZjmFA2R, "Application(UnknownBlock(\"State already
discarded for BlockId::Hash(0xf95816c9150a7bae4bb59e7fdb9673c13cabd4d1eceb76fbd5e735e4b606f383)\"))"
Sep 27 03:33:30 mkaki alphanet[27237]: 2022-09-27 03:33:30 [🌗] 💔 Error importing block 0x15514b6e7b8171539baa201a10d453629aeeba6e65dbfb15a3f0afd41ecaec96: block has an unknown parent                                                                                                Sep 27 03:33:30 mkaki alphanet[27237]: 2022-09-27 03:33:30 [🌗] 💔 Error importing block 0x115ae550e1f639b7e1709424bc66802867735127db13b11fcba9f58872a07a7a: block has an unknown parent                                                                                                Sep 27 03:33:30 mkaki alphanet[27237]: 2022-09-27 03:33:30 [🌗] 💔 Verification failed for block 0xeb46e3ddc8037d8a800466f3fb210027c5191d04c7d69abcfc4a0676fba684ca,received from peer: 12D3KooWNtwcFhwfsTb14BiUX4jTHvDVY424nyDySYWMNZjmFA2R, "Application(UnknownBlock(\"State already
discarded for BlockId::Hash(0xf95816c9150a7bae4bb59e7fdb9673c13cabd4d1eceb76fbd5e735e4b606f383)\"))"
Sep 27 03:33:30 mkaki alphanet[27237]: 2022-09-27 03:33:30 [Relaychain] 🔍 Discovered new external address for our node: /ip4/45.61.161.227/tcp/30334/ws/p2p/12D3KooWFjH5syjkR1j7Hw3RoqyRFqocSbDjSBAN4T83pS8Q6W79                                                                       Sep 27 03:33:30 mkaki alphanet[27237]: 2022-09-27 03:33:30 [🌗] 🔍 Discovered new external address for our node: /ip4/45.61.161.227/tcp/30333/p2p/12D3KooWJqhGb6TW2hG4A7SdLihwNGdn1CC6n4f9Rh8uSmDr9C7o                                                                                  Sep 27 03:33:30 mkaki alphanet[27237]: 2022-09-27 03:33:30 [Relaychain] Received msg before first active leaves update. This is not expected - message will be dropped. msg=ActiveDisputes(Sender { complete: false })                                                                  Sep 27 03:33:30 mkaki alphanet[27237]: 2022-09-27 03:33:30 [Relaychain] error=Sender(AskActiveDisputesCanceled) ctx="on FromOrchestra"
Sep 27 03:33:30 mkaki alphanet[27237]: 2022-09-27 03:33:30 [🌗] 💔 Verification failed for block 0xeb46e3ddc8037d8a800466f3fb210027c5191d04c7d69abcfc4a0676fba684ca received from peer: 12D3KooWLkGLsJMmQDCXDitJn6y6ZTPXqmcQ7bkMDKpsx6YWiZDD, "Application(UnknownBlock(\"State already
discar

And the best stays at #1

To test:

wget https://github.com/PureStake/moonbeam/releases/download/v0.26.1/moonbeam
chmod u+x moonbeam
./moonbeam --tmp --sync=fast

However if I use --sync full for some blocks and them switch to --sync fast it works
(the node automatically switch to full if you initially started with full)

[bkchr]

You will probably want to have this: #1619

[crystalin]

I tried with it and still get the same issue (I tried with 0.9.40)

[bkchr]

@crystalin you will need to adapt nimbus to work with header only sync/warp sync.

Something similar to paritytech/substrate#13221

[bkchr]

@crystalin now that Nimbus supports warp sync fast sync should also work.