[GitHub] [rocketmq-client-go] wolftankk edited a comment on issue #139: fatal error: concurrent map writes

[GitBox <gi...@apache.org>]

wolftankk edited a comment on issue #139: fatal error: concurrent map writes
URL: https://github.com/apache/rocketmq-client-go/issues/139#issuecomment-517638876
 
 
   it must add locker for CAS, so in 
   ```golang
   func (local *localFileOffsetStore) update(mq *primitive.MessageQueue, offset int64, increaseOnly bool) {
   	rlog.Debugf("update offset: %s to %d", mq, offset)
   	localOffset, exist := local.OffsetTable[mq.Topic]
   	if !exist {
   		localOffset = make(map[int]*queueOffset)
   		local.OffsetTable[mq.Topic] = localOffset
   	}
   	q, exist := localOffset[mq.QueueId]
   	if !exist {
   		q = &queueOffset{
   			QueueID: mq.QueueId,
   			Broker:  mq.BrokerName,
   		}
   		localOffset[mq.QueueId] = q
   	}
   	if increaseOnly {
   		if q.Offset < offset {
   			q.Offset = offset
   		}
   	} else {
   		q.Offset = offset
   	}
   }```
   
   it will add 
   
   ```
   func (local *localFileOffsetStore) update(mq *primitive.MessageQueue, offset int64, increaseOnly bool) {
           local.mutex.Lock()
   	defer local.mutex.Unlock()
   ```

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