在启动Cassandra Cluster Manager时收到警告

Question

当我使用命令ccm启动ccm start（Cassandra Cluster Manager）时，收到以下警告。

C:\...\ccm-3.1.4.tar\dist\ccm-3.1.4\ccmlib\cluster_factory.py:22: YAMLLoadWarning: calling yaml.load() without Loader=... is deprecated, as the default Loader is unsafe. Please read https://msg.pyyaml.org/load for full details.
  data = yaml.load(f)
C:\...\ccm-3.1.4.tar\dist\ccm-3.1.4\ccmlib\node.py:143: YAMLLoadWarning: calling yaml.load() without Loader=... is deprecated, as the default Loader is unsafe. Please read https://msg.pyyaml.org/load for full details.
  data = yaml.load(f)
Started: node1 with pid: 16200
Started: node3 with pid: 14780
Started: node2 with pid: 6868

这些警告是什么意思，如何删除它们？