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Varlog is a strongly consistent distributed log storage. It enables many distributed systems to leverage total-ordered logs to support transactional event processing with high performance, and simplify the building the complex distributed systems.


With Go module support, add the following import to your code.

import ""


// Open the log.
vlog, _ := varlog.Open(context.Background(), clusterID, mrAddrs)

// Write records to the log.
vlog.Append(context.Background(), topicID, [][]byte{[]byte("hello"), []byte("varlog")})

// Read records from the log.
closer, _ := vlog.Subscribe(context.Background(), topicID, begin, end, func(logEntry varlogpb.LogEntry, err error) {
defer closer()


This software is licensed under the Apache 2 license, quoted below.

Copyright 2022 Kakao Corp.

Licensed under the Apache License, Version 2.0 (the “License”); you may not use this project except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.


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