ruojieranyishen opened a new issue, #2041:
URL: https://github.com/apache/incubator-pegasus/issues/2041
# background
1. Users use multiple clients to access the cluster. It is not easy to
collect hot content. （Advertising business scene）
2. Obtain hot content can help users optimize reading and writing.
# idea
Implement a function to sample the read content over a period of time. [In
get mult-get operation]
example：
```c++
// "sample_key",
// "start or stop sample sort keys on a replica of a replica server",
// "<-a|--app_id num> "
// "<-p|--partition_index_list num> "
// "<-c|--sample_action start|stop|query> "
// "<-t|--duration_time_minute num>"
// "<-s|--sampling_times num>"
// "<-l--node_list>"
// "<-r|--reslove_ip>"
```
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