maoling opened a new pull request, #2698:
URL: https://github.com/apache/cassandra/pull/2698
- add time elapsed for simple CQL statement in the cql shell. For example(a
simple select):
```
cassandra@cqlsh:cycling> select * from cyclist_name;
id | firstname | lastname
--------------------------------------+-----------+----------
4647f6d3-7bd2-4085-8d6c-1229351b5498 | ling | mao
4647f6d3-7bd2-4085-8d6c-1229351b5411 | wu | wang
4647f6d3-7bd2-4085-8d6c-1229351b5410 | si | li
(3 rows, 3ms elapsed)
```
- Turning on the tracing feature, we can know the time of every stage which
is the inner executed time of C* cluster, but using this new added elapsed time
of cql(combined with tracing), we can now diagnose/measure the network latency
issue between client(cql shell) and coordinator
- more details in the
[CASSANDRA-18861](https://issues.apache.org/jira/browse/CASSANDRA-18861)
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