chaoyli edited a comment on issue #3517:
URL:
https://github.com/apache/incubator-doris/issues/3517#issuecomment-625588846
The metric is like this
```
[
{
"tags":{
"tablet_id":10010,
"metric":"scanner_rows"
},
"value":1000,
"unit":"number"
},
{
"tags":{
"tablet_id":10010,
"metric":"scanner_bytes"
},
"value":1024,
"unit":"bytes"
}
]
```
Supposing there are 10000 tablets in one BE node and collecting metrics at
every 15 seconds.
Every time we will gather 10000 * 200 Bytes = 2MB, one hundred nodes will
collect 200MB.
For metric in one BE node, I will use a map to store the information.
```
std::unordered_map<tablet_id, metric> tablet_metric.
```
Considering the timeliness, We should only need recent metric in one hour.
So I will add another map will change to
```
std::unordered_map<tablet_id, metric> tablet_metric.
std::map<access_time, tablet_id> tablets_access_time;
```
Tablets_access_time to update the tablet_id access_time, only tablets access
in the last hour will be significantly.
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