Thanks for replying. That's to say, the drivers fetch metadata from server with heartbeat interval 30s. Right ?
So if I change the value of one property of a table, I can see the change at cqlsh commandline within at most 30s ? -----邮件原件----- 发件人: Benjamin Lerer [mailto:benjamin.le...@datastax.com] 发送时间: 2018年8月7日 19:45 收件人: dev@cassandra.apache.org 主题: [营销类邮件] Re: Would cqlsh describe command send query to cassandra server ? Hi, DESCRIBE commands are handled at the driver level not at the server level. The drivers fetch metadata and keep them up to date. When a DESCRIBE command is send, the driver build the output from those metadata. Benjamin On Tue, Aug 7, 2018 at 1:33 PM, 陈仕（shichen）-技术产品中心 <shic...@qiyi.com> wrote: > > Hello, all. > > I try to use `desc keyspaces` or desc table t`, and at the same time > capture network packets at Cassandra side with tcpdump. > My tcpdump command is like this: tcpdump -i eth0 ip host 10.110.27.6 > -X But I found no string such as desc or keyspaces or table in the output. > > So I wonder whether cqlsh fetch keyspace’s and table’s metadata just > from local and not send query to server node ? > > Thanks. >
