cmd/utils, eth/ethconfig: unindex txs older than ~1 year #22293
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holiman
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Feb 10, 2021
holiman
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Feb 10, 2021
cmd/utils/flags.go
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| Name: "txlookuplimit", | ||
| Usage: "Number of recent blocks to maintain transactions index by-hash for (default = index all blocks)", | ||
| Value: 0, | ||
| Usage: "Number of recent blocks to maintain transactions index by-hash for (default = index about one year)", |
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Does 0 mean infinity ? Might need a clarification in the Usage
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Yeah, there's no way to say infinity in Go, so 0 is kind of "disable"
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Right, but 0, for a uint-flag, might to the user mean "Don't index anything". And if the user sets 0 with that notion, it's bad UX
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Alternatives:
- keep it as a
intflag, and make-1mean "everything" - Add to teh Usage string:
(default = index about one year, 0 = index everything)
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Went with the 2nd suggestion
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https://twitter.com/peter_szilagyi/status/1358767100995784704 .
This PR changes the default number of indexed transaction from infinite to the most recent 1 year (assuming block times of around 13-14s).
The reasoning behind this change is that currently on mainnet there are over 1 billion transactions. Just tracking the
hash->blocknummapping weighs 33GB on the database (requires SSD speeds due to the hash keying) and represents 3/5th of the database entry count, which makes trie operations and compactions exceedingly expensive.Without any form of pruning, the transaction index dataset grows indefinitely. We must bite the bullet and have normal full nodes retain meaningful history, but not indefinite.
Operators still wishing to index all transactions since genesis can run geth with
--txlookuplimit=0. The index can be reconstructed even if it was pruned, so no data is lost. The index is not needed for network health, it's just a local acceleration structure.-