LvChenhui opened a new issue #3673:
URL: https://github.com/apache/rocketmq/issues/3673
when we use method resetOffsetByTimestampMillis to reset offset，at the same
time，our consumer not online，actual use method resetOffsetByTimestampOld.
**topicRouteMap** store the relationship between brokerAddr and
readQueueNums，but
in the following code，the latter readQueueNumber will cover the former.
```
TopicRouteData topicRouteData = this.examineTopicRouteInfo(topic);
List<RollbackStats> rollbackStatsList = new
ArrayList<RollbackStats>();
Map<String, Integer> topicRouteMap = new HashMap<String, Integer>();
for (BrokerData bd : topicRouteData.getBrokerDatas()) {
for (QueueData queueData : topicRouteData.getQueueDatas()) {
topicRouteMap.put(bd.selectBrokerAddr(),
queueData.getReadQueueNums());
}
}
```
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