[GitHub] [rocketmq] caigy commented on issue #3800: console dashboard 页面疑问

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

caigy commented on issue #3800:
URL: https://github.com/apache/rocketmq/issues/3800#issuecomment-1022808023


   It is calculate by the metric `getTotalTps`, which shows the tps of _getMessage_ call.
   
   1. When `org.apache.rocketmq.store.DefaultMessageStore#getMessage` is called, `getMessageTimesTotalFound` or `getMessageTimesTotalMiss` is incremented. 
   2. `org.apache.rocketmq.store.StoreStatsService#sampling` is executed every second, and tag the current `getMessageTimesTotalFound`  or  `getMessageTimesTotalMiss` with current timestamp, and put them in `getTimesFoundList` or `getTimesMissList` separately. 
   3. So each list contains a time series record of the number of _getMessage_ operation, and each the timestamp between two consecutive item is about 1 second. The interval is NOT precise, because the generation of record is triggered by scheduled service in step 2. 
   4. If you get the last X items in the list, sum the number of call times and divide the result by X, you can get the `getTotalTps` in the last X seconds.


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