cache first version for legacy versions (#1018)

cosmos · Dec 16, 2024 · e60601d · e60601d
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -14,6 +14,7 @@
 - [#965](https://github.com/cosmos/iavl/pull/965) Use expected interface for expected IAVL `Logger`.
 - [#970](https://github.com/cosmos/iavl/pull/970) Close the pruning process when the nodeDB is closed.
 - [#980](https://github.com/cosmos/iavl/pull/980) Use the `sdk/core/store.KVStoreWithBatch` interface instead of `iavl/db.DB` interface
+- [#1018](https://github.com/cosmos/iavl/pull/1018) Cache first version for legacy versions, fix performance regression after upgrade.
 
 ## v1.2.0 May 13, 2024
 

diff --git a/nodedb.go b/nodedb.go
@@ -738,6 +738,7 @@ func (ndb *nodeDB) getFirstVersion() (int64, error) {
 	if itr.Valid() {
 		var version int64
 		legacyRootKeyFormat.Scan(itr.Key(), &version)
+		ndb.resetFirstVersion(version)
 		return version, nil
 	}
 	// Find the first version