问题：linux生成随机密码，随机字符串
方法：
openssl rand -base64 12
openssl rand -hex 16
拓展：
使用pwgen模块，但需要先安装
put: File /spark-jars/zstd-jni-1.4.4-3.jar._COPYING_ could only be written to 0 of the 1 minReplication nodes. There are 0 datanode(s) running and 0 node(s) are excluded in this operation.
ffmpeg获取视频时长
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