Clarification of the snapshots

[wtdcode]

I'm trying to understand what these snapshots contain. Although there are already many discussions on this, I don't see a clarification or comparison and thus I'm trying to do it. My understanding of geth is limited so please correct me if anything is wrong.

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Some definitions:

• state: Contract state variables value
• block: Bodies, contains the properties of a transaction like from, to...
• receipts: Execution results and logs
• header: Properties of blocks, like hash, number ...

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Full node snapshots of this repo (2.4T roughly):

From #340

• state: Only recent 90k blocks
• block: Full chain
• receipts: Full chain
• header: Full chain

Full node snapshots of 48Club (800G roughly):

• state: Only recent 128 blocks. <---- Just confirmed with this. But with --tries-verify-mode=none, state beyond 128 blocks will return missing trie node.
• block: Only recent 90k blocks
• receipts: Only recent 90k blocks
• header: Only recent 90k blocks

Fast node snapshots of 48Club (200G roughly):

• state: Only recent 128 blocks. <----- I'm running a fast node indeed and find this. And most importantly, if the state is not available, RPC won't report an error and returns 0!
• block: Only recent 90k blocks
• receipts: Only recent 90k blocks
• header: Only recent 90k blocks

Erigon Snapshots (~8T):

• state: Full chain
• block: Full chain
• receipts: Full chain
• header: Full chain

Please clarify if these understand is correct.

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cc

@du5
@zzzckck

[zzzckck]

Basically, you are right, I can update these clarification into the FAQ.

[wtdcode]

Basically, you are right, I can update these clarification into the FAQ.

@zzzckck Which snapshot shall I use if I want to access more than 128 blocks live state? Or is that possible?

[zzzckck]

Basically, you are right, I can update these clarification into the FAQ.

@zzzckck Which snapshot shall I use if I want to access more than 128 blocks live state? Or is that possible?

right now, I am afraid only Erigon archive node can support it, PBSS only keeps the most recent 128+1 state.

[zzzckck]

Include this issue in FAQ as the 1st question.
#349
@wtdcode pls check, if it answers your question.

[wtdcode]

Cool, thanks for the explanation. Will the hash-based scheme be deprecated finally?

[zzzckck]

Cool, thanks for the explanation. Will the hash-based scheme be deprecated finally?

It is not determined yet, currently we just make sure hash-based function will not be broken, but in long run, if it could be deprecated if it needs too much effort to maintain it.