dmbj opened a new issue #2460:
URL: https://github.com/apache/rocketmq/issues/2460
rocketmq4.6 2m2s-async config，1 springboot rocket-client service
client service produce msg is ok，same service listen & consume msg. consume
will work howerver sometimes consume delay 10s or more. no warning&error in
client-service log, delay time was usually 10s，occasionally 28s，it seem a
pattern.
broker-a-s.properties
```
brokerClusterName=testCluster
brokerName=broker-a
brokerId=1
deleteWhen=02
fileReservedTime=48
brokerRole=SLAVE
flushDiskType=ASYNC_FLUSH
listenPort=6001
autoCreateTopicEnable=true
traceTopicEnable=true
namesrvAddr=172.21.4.7:9876;172.21.4.10:9876
storePathRootDir=/www/rocketmq-store/broker-a
storePathCommitLog=/www/rocketmq-store/broker-a/commitlog
storePathConsumeQueue=/www/rocketmq-store/broker-a/consumequeue
storePathIndex=/www/rocketmq-store/broker-a/index
storeCheckpoint=/www/rocketmq-store/broker-a/checkpoint
abortFile=/www/rocketmq-store/broker-a/abort
```
client-service log:
```
2020-11-27 10:28:41 INFO [code-trades-bus,,,]
c.c.controller.BusTradeController.tradesReceive(86)
发送交易topic数据：{"channelNo":"02","price":1,"terminalId":"1022000015","terminalSn":"1022000015_1574754592","tradeDate":1606444129834,"tradeAddress":"测试公交502;4500101","userId":"00000000000104957110","tradeType":"00","tradeSeq":"50dd1473a5f94b24b3760ed88574aa11","operator":"000000","customDomain":"e6aca2e8bf8ee69da5e588b062656a736f6e2e636f6d21","merchantNo":"45040001"}，结果：SendResult
[sendStatus=SEND_OK,
msgId=FE80000000000000F8163EFFFE65F5B90000439F5B3D8824EC140038,
offsetMsgId=AC15040A00001B590000000000054858, messageQueue=MessageQueue
[topic=tradeMsgTopic, brokerName=broker-a, queueId=0], queueOffset=2]
2020-11-27 10:28:43 DEBUG [code-trades-bus,,,]
c.c.f.a.i.RemoteConfigLongPollService.doLongPollingRefresh(172) Long polling
response: 304, url:
http://172.21.4.8:23004/notifications/v2?cluster=default&appId=code-trades-bus&ip=172.21.4.8¬ifications=%5B%7B%22namespaceName%22%3A%22application%22%2C%22notificationId%22%3A80%7D%5D
2020-11-27 10:28:43 DEBUG [code-trades-bus,,,]
c.c.f.a.i.RemoteConfigLongPollService.doLongPollingRefresh(163) Long polling
from
http://172.21.4.8:23004/notifications/v2?cluster=default&appId=code-trades-bus&ip=172.21.4.8¬ifications=%5B%7B%22namespaceName%22%3A%22application%22%2C%22notificationId%22%3A80%7D%5D
2020-11-27 10:28:51 INFO [code-trades-bus,,,]
c.c.common.conf.BusTradesMQConfig.consumeMessage(93)
目标：{"channelNo":"02","customDomain":"e6aca2e8bf8ee69da5e588b062656a736f6e2e636f6d21","merchantNo":"45040001","operator":"000000","price":1,"receiveDate":1606444121108,"terminalId":"1022000015","terminalSn":"1022000015_1574754592","tradeAddress":"测试公交502;4500101","tradeDate":1606444129834,"tradeSeq":"50dd1473a5f94b24b3760ed88574aa11","tradeType":"00","userId":"00000000000104957110"}，启动消费，消息相关：szjt-fwpt-ybb-tst05.novalocal，tradeMsgTopic-transitBrtTradeTag...
```
then i use rocketmq-console find something might useful, trigger a history
message resend seem MQ timeout 10s then retryconsume ok, but network is seem
fine & i couldn't find any warn&error in broker log
please help! it bother me few days
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