Sparkcontext: error initializing sparkcontext solution

Spark In configuring a highly available cluster , There is an error
ERROR SparkContext: Error initializing SparkContext. java.net.ConnectException: Call From hadoop102/192.168.10.102 to hadoop102:8020 failed on connection exception: java.net.ConnectException: Connection refused;

This is because we configured Spark Logs are stored in HDFS in , But it's opening Spark After cluster , But it didn't open Hadoop, Cause the task submission times to be wrong .

Solution ：

1. No longer store event logs
   find Spark The installation directory /conf/spark-defaults.conf file , As shown in the figure , Comment out the corresponding event log section
   
2. Store the event log locally , Instead of HDFS in
   Replace the directory in the second line in the above figure with Linux Local directory
3. start-up Hadoop colony （ namely HDFS service ）
   Investigate the cause of the error , Or we configured spark Log stored in HDFS in , But it didn't open HDFS, So open Hadoop Just cluster