a619646645 edited a comment on issue #2427:
URL: https://github.com/apache/rocketmq/issues/2427#issuecomment-730199185


   这几天在写CURD,这个问题还是存在,
   #### store.log中[PAGECACHERT]的统计存在明显的刷盘超时:
   `2020-11-18 14:22:05 INFO StoreStatsService - [PAGECACHERT] TotalPut 50, 
PutMessageDistributeTime [<=0ms]:10 [0~10ms]:35 [10~50ms]:0 [50~100ms]:0 
[100~200ms]:0 [200~500ms]:0 [500ms~1s]:1 [1~2s]:1 [2~3s]:1 [3~4s]:0 [4~5s]:2 
[5~10s]:0 [10s~]:0 `
   
   #### 在每次发生这个现象的时候都会出现这些异常:
   我们的broker配置如下:
   ```
   brokerClusterName = DefaultCluster
   brokerName = broker-a
   brokerId = 0
   deleteWhen = 04
   fileReservedTime = 48
   brokerRole = ASYNC_MASTER
   flushDiskType = ASYNC_FLUSH
   ```
   
   看PAGECACHERT中有 2--3s:1、4--5s:2   这种明显的超时
   ```
   2020-11-18 14:21:05 INFO StoreStatsService - [PAGECACHERT] TotalPut 52, 
PutMessageDistributeTime [<=0ms]:9 [0~10ms]:43 [10~50ms]:0 [50~100ms]:0 
[100~200ms]:0 [200~500ms]:0 [500ms~1s]:0 [1~2s]:0 [2~3s]:0 [3~4s]:0 [4~5s]:0 
[5~10s]:0 [10s~]:0 
   2020-11-18 14:21:14 WARN ReadSocketService - ha housekeeping, found this 
connection[/slaveIP:47894] expired, 20019
   2020-11-18 14:21:14 INFO ReadSocketService - ReadSocketService service end
   2020-11-18 14:21:14 INFO AcceptSocketService - HAService receive new 
connection, /slaveIP:33400
   2020-11-18 14:21:14 INFO ReadSocketService - ReadSocketService service 
started
   2020-11-18 14:21:14 INFO WriteSocketService - WriteSocketService service 
started
   2020-11-18 14:21:14 INFO WriteSocketService - WriteSocketService service end
   2020-11-18 14:21:19 INFO ReadSocketService - slave[/slaveIP:33400] request 
offset 2235247317
   2020-11-18 14:21:19 INFO WriteSocketService - master transfer data from 
2235247317 to slave[/slaveIP:33400], and slave request 2235247317
   2020-11-18 14:21:19 WARN SendMessageThread_40 - putMessage not in lock 
eclipse time(ms)=4370, bodyLength=492
   2020-11-18 14:21:19 WARN SendMessageThread_37 - putMessage not in lock 
eclipse time(ms)=4056, bodyLength=466
   2020-11-18 14:21:19 WARN SendMessageThread_34 - putMessage not in lock 
eclipse time(ms)=2280, bodyLength=459
   2020-11-18 14:21:19 WARN SendMessageThread_10 - putMessage not in lock 
eclipse time(ms)=1081, bodyLength=523
   2020-11-18 14:21:19 WARN SendMessageThread_28 - putMessage not in lock 
eclipse time(ms)=719, bodyLength=444
   2020-11-18 14:22:05 INFO StoreStatsService - [STORETPS] put_tps 
0.8332777814812345 get_found_tps 0.8332777814812345 get_miss_tps 
4.466368908739417 get_transfered_tps 0.8332777814812345
   2020-11-18 14:22:05 INFO StoreStatsService - [PAGECACHERT] TotalPut 50, 
PutMessageDistributeTime [<=0ms]:10 [0~10ms]:35 [10~50ms]:0 [50~100ms]:0 
[100~200ms]:0 [200~500ms]:0 [500ms~1s]:1 [1~2s]:1 [2~3s]:1 [3~4s]:0 [4~5s]:2 
[5~10s]:0 [10s~]:0 
   ```
   
   #### GC的情况:
   查看了GC的日志,发现GC是没有什么问题的,GC时间都很短而且在RemotingTimeoutException异常发生时没有出现GC
   
   认真研读了Commitlog#putmessage(msg) 
的逻辑,同时观察日志没有出现明显的异常,现在似乎是卡在这里了,是不是我们的内存配置,或者是主从交换的配置有什么问题,看到有一个issue:[issues428](https://github.com/apache/rocketmq/issues/428)的情况跟我一样,是有关于心跳的问题吗?
   
   @RongtongJin 期待您的回答,万分感谢您!


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