spark启动slave时提示 JAVA_HOME not set

解决方法：

spark-config.sh 中添加jdk 路径
export JAVA_HOME=/usr/local/java/jdk1.8.0_171
如下：

if [ -z "${PYSPARK_PYTHONPATH_SET}" ]; then
  export PYTHONPATH="${SPARK_HOME}/python:${PYTHONPATH}"
  export PYTHONPATH="${SPARK_HOME}/python/lib/py4j-0.10.3-src.zip:${PYTHONPATH}"
  export PYSPARK_PYTHONPATH_SET=1
  export JAVA_HOME=/usr/local/java/jdk1.8.0_171
fi