diff options
Diffstat (limited to 'src/rpc/blockchain.cpp')
| -rw-r--r-- | src/rpc/blockchain.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp index 6402819ce6..cecad55aee 100644 --- a/src/rpc/blockchain.cpp +++ b/src/rpc/blockchain.cpp @@ -2702,6 +2702,13 @@ UniValue CreateUTXOSnapshot( size_t written_coins_count{0}; std::vector<std::pair<uint32_t, Coin>> coins; + // To reduce space the serialization format of the snapshot avoids + // duplication of tx hashes. The code takes advantage of the guarantee by + // leveldb that keys are lexicographically sorted. + // In the coins vector we collect all coins that belong to a certain tx hash + // (key.hash) and when we have them all (key.hash != last_hash) we write + // them to file using the below lambda function. + // See also https://github.com/bitcoin/bitcoin/issues/25675 auto write_coins_to_file = [&](AutoFile& afile, const Txid& last_hash, const std::vector<std::pair<uint32_t, Coin>>& coins, size_t& written_coins_count) { afile << last_hash; WriteCompactSize(afile, coins.size()); |