graphite precision less than 1 minutes in centOS7: what am I missing?

I followed the accepted answer in this post: Graphite - render precision lower than 1 minute

but still couldn't get graphite to give a 5-second precision time period.

I am using centOS 7 and here are my configurations that I have added/changed:

#/etc/graphite-web/local_settings.py
...
DEFAULT_CACHE_DURATION = 5
...

# /etc/carbon/storage-schemas.conf
...
[statsd]
pattern = ^stats\.
retentions = 5s:30d
...

statsd is flushing every 5 seconds correctly according to the following settings.

# statsd config.js
{
  graphitePort: 2003
, graphiteHost: "127.0.0.1"
, port: 8125
, backends: [ "./backends/graphite" ]
, graphite: {
    legacyNamespace: false
    }
, flushInterval: 5000
}

I have also executed the restart commands:

sudo systemctl restart carbon-cache
sudo systemctl restart statsd

Copyright Notice：Content Author:「cr001」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/73003602/graphite-precision-less-than-1-minutes-in-centos7-what-am-i-missing