コード例 #1
0
ファイル: abort_cache.go プロジェクト: GitGoldie/cockroach
func copySeqCache(
	e engine.Engine,
	ms *engine.MVCCStats,
	srcID, dstID roachpb.RangeID,
	keyMin, keyMax engine.MVCCKey,
) (int, error) {
	var scratch [64]byte
	var count int
	var meta engine.MVCCMetadata
	// TODO(spencer): look into making this an MVCCIteration and writing
	// the values using MVCC so we can avoid the ugliness of updating
	// the MVCCStats by hand below.
	err := e.Iterate(keyMin, keyMax,
		func(kv engine.MVCCKeyValue) (bool, error) {
			// Decode the key, skipping on error. Otherwise, write it to the
			// corresponding key in the new cache.
			txnID, err := decodeAbortCacheMVCCKey(kv.Key, scratch[:0])
			if err != nil {
				return false, util.Errorf("could not decode an abort cache key %s: %s", kv.Key, err)
			}
			key := keys.AbortCacheKey(dstID, txnID)
			encKey := engine.MakeMVCCMetadataKey(key)
			// Decode the MVCCMetadata value.
			if err := proto.Unmarshal(kv.Value, &meta); err != nil {
				return false, util.Errorf("could not decode mvcc metadata %s [% x]: %s", kv.Key, kv.Value, err)
			}
			value := meta.Value()
			value.ClearChecksum()
			value.InitChecksum(key)
			meta.RawBytes = value.RawBytes

			keyBytes, valBytes, err := engine.PutProto(e, encKey, &meta)
			if err != nil {
				return false, err
			}
			count++
			if ms != nil {
				ms.SysBytes += keyBytes + valBytes
				ms.SysCount++
			}
			return false, nil
		})
	return count, err
}
コード例 #2
0
func copySeqCache(
	e engine.Engine,
	ms *engine.MVCCStats,
	srcID, dstID roachpb.RangeID,
	keyMin, keyMax engine.MVCCKey,
) (int, error) {
	var scratch [64]byte
	var count int
	err := e.Iterate(keyMin, keyMax,
		func(kv engine.MVCCKeyValue) (bool, error) {
			// Decode the key into a cmd, skipping on error. Otherwise,
			// write it to the corresponding key in the new cache.
			txnID, epoch, seq, err := decodeSequenceCacheMVCCKey(kv.Key, scratch[:0])
			if err != nil {
				return false, util.Errorf("could not decode a sequence cache key %s: %s",
					kv.Key, err)
			}
			key := keys.SequenceCacheKey(dstID, txnID, epoch, seq)
			encKey := engine.MakeMVCCMetadataKey(key)
			// Decode the value, update the checksum and re-encode.
			meta := &engine.MVCCMetadata{}
			if err := proto.Unmarshal(kv.Value, meta); err != nil {
				return false, util.Errorf("could not decode sequence cache value %s [% x]: %s",
					kv.Key, kv.Value, err)
			}
			value := meta.Value()
			value.ClearChecksum()
			value.InitChecksum(key)
			meta.RawBytes = value.RawBytes

			keyBytes, valBytes, err := engine.PutProto(e, encKey, meta)
			if err != nil {
				return false, err
			}
			count++
			if ms != nil {
				ms.SysBytes += keyBytes + valBytes
				ms.SysCount++
			}
			return false, nil
		})
	return count, err
}