运行kafka时遇到的问题

Question

当我在运行这个命令时：

sudo /usr/bin/spark-submit --packages org.apache.spark:spark-streaming-kafka_2.10:1.5.1 twitterStream.py

报错：

Exception in thread "main" java.io.IOException: Cannot run program "python": error=2, No such file or directory

我的系统是CentOS，已经安装python3.5.4，并且使用命令python能正常进入python。

而当我去掉sudo后运行：

sudo /usr/bin/spark-submit --packages org.apache.spark:spark-streaming-kafka_2.10:1.5.1 twitterStream.py

报错：

py4j.protocol.Py4JJavaError: An error occurred while calling o22.checkpoint.
: java.net.ConnectException: Call From quickstart.cloudera/192.168.xxx.xxx to quickstart.cloudera:8020 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused

请问这个问题我应该如何解决？