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I am answering my own question. The problem seems to be related to ulimit.(source) However, there is no API for setting ulimit in kolla-ansible in all current releases, and only after this commit in master branch.

So, I have solved the prolem by checking to that commit, and add the following config /etc/kolla/globals.yml.

memcached_dimensions:
  ulimits:
    nofile:
      soft: 98304
      hard: 98304