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server: Written Snapshot's to WAL contains populated ConfState.

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This will (among others) allow etcd-3.6 to not depend on store_v2 .snap files at all,
as WAL + db file will be self-sufficient.
This commit is contained in:
Piotr Tabor
2021-02-28 14:40:01 +01:00
parent fce0c192eb
commit 4d4c84e014
7 changed files with 108 additions and 46 deletions
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12
server/wal/walpb/record.go
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@@ -27,3 +27,15 @@ func (rec *Record) Validate(crc uint32) error {
rec.Reset()
return ErrCRCMismatch
}
// ValidateSnapshotForWrite ensures the Snapshot the newly written snapshot is valid.
//
// There might exist log-entries written by old etcd versions that does not conform
// to the requirements.
func ValidateSnapshotForWrite(e *Snapshot) error {
// Since etcd>=3.5.0
if e.ConfState == nil && e.Index > 0 {
return errors.New("Saved (not-initial) snapshot is missing ConfState: " + e.String())
}
return nil
}