An error occurred while calling None.org.apache.spark.api.java.JavaSparkContext.

最近公司上云，所有大数据环境都迁移到云上。在进行项目迁移时候发现运行报错

py4j.protocol.Py4JJavaError: An error occurred while calling None.org.apache.spark.api.java.JavaSparkContext.
: java.lang.NullPointerException
        at org.apache.spark.SparkContext.(SparkContext.scala:560)
        at org.apache.spark.api.java.JavaSparkContext.(JavaSparkContext.scala:58)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
        at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:247)
        at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
        at py4j.Gateway.invoke(Gateway.java:238)
        at py4j.commands.ConstructorCommand.invokeConstructor(ConstructorCommand.java:80)
        at py4j.commands.ConstructorCommand.execute(ConstructorCommand.java:69)
        at py4j.GatewayConnection.run(GatewayConnection.java:238)
        at java.lang.Thread.run(Thread.java:748)

项目在生产环境没问题，到云环境就出问题了。

经过排查是云环境安装了两个版本spark /spark-2.4.8-bin-without-hadoop和/spark-2.4.8-bin-without-hadoop-2.12

tcp6       0      0 10.10.1.19:44358        10.10.1.101:3306        ESTABLISHED -                   
[hadoop@namenode-1:/data/dps-hadoop/soft/spark-2.4.8-bin-without-hadoop/conf] $ netstat  -anp  |grep  7077
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
tcp6       0      0 10.10.1.19:7077         :::*                    LISTEN      20786/java          
tcp6       0      0 10.10.1.19:7077         10.10.1.22:45244        ESTABLISHED 20786/java          
tcp6       0      0 10.10.1.19:7077         10.10.1.20:58022        ESTABLISHED 20786/java          
tcp6       0      0 10.10.1.19:7077         10.10.1.21:40242        ESTABLISHED 20786/java    

经过排查发现7077的spark端口被2078监听

[hadoop@namenode-1:/data/dps-hadoop/soft/spark-2.4.8-bin-without-hadoop/conf] $ netstat  -anp  |grep  20786
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
tcp6       0      0 :::8080                 :::*                    LISTEN      20786/java          
tcp6       0      0 10.10.1.19:7077         :::*                    LISTEN      20786/java          
tcp6       0      0 10.10.1.19:7077         10.10.1.22:45244        ESTABLISHED 20786/java          
tcp6       0      0 10.10.1.19:7077         10.10.1.20:58022        ESTABLISHED 20786/java          
tcp6       0      0 10.10.1.19:7077         10.10.1.21:40242        ESTABLISHED 20786/java   

再循着2078查看发现被两个进程监听

[hadoop@namenode-1:/data/dps-hadoop/soft/spark-2.4.8-bin-without-hadoop/conf] $ ps -ef|grep 20786
hadoop    1379 22597  0 17:20 pts/0    00:00:00 grep --color=auto 20786
hadoop   20786     1  0 Jun10 ?        00:07:00 /data/dps-hadoop/soft/jdk1.8.0_291/bin/java -cp /data/dps-hadoop/soft/spark-2.4.8-bin-without-hadoop-scala-2.12/conf/:/data/dps-hadoop/soft/spark-2.4.8-bin-without-hadoop-scala-2.12/jars/*:/data/dps-hadoop/hadoop-2.10.1/etc/hadoop/:/data/dps-hadoop/hadoop-2.10.1/share/hadoop/common/lib/*:/data/dps-hadoop/hadoop-2.10.1/share/hadoop/common/*:/data/dps-hadoop/hadoop-2.10.1/share/hadoop/hdfs/:/data/dps-hadoop/hadoop-2.10.1/share/hadoop/hdfs/lib/*:/data/dps-hadoop/hadoop-2.10.1/share/hadoop/hdfs/*:/data/dps-hadoop/hadoop-2.10.1/share/hadoop/yarn/:/data/dps-hadoop/hadoop-2.10.1/share/hadoop/yarn/lib/*:/data/dps-hadoop/hadoop-2.10.1/share/hadoop/yarn/*:/data/dps-hadoop/hadoop-2.10.1/share/hadoop/mapreduce/lib/*:/data/dps-hadoop/hadoop-2.10.1/share/hadoop/mapreduce/*:/data/dps-hadoop/hadoop-2.10.1/contrib/capacity-scheduler/*.jar -Xmx1g org.apache.spark.deploy.master.Master --host namenode-1 --port 7077 --webui-port 8080

再循着pid找到该进程，发现与预期的spark版本不一致，不需要2.12版本

[hadoop@namenode-1:/data/dps-hadoop/soft/spark-2.4.8-bin-without-hadoop/conf] $ jps
1536 RunJar
20786 Master
836 SparkSubmit
32469 Master
17462 HMaster
12729 ResourceManager
1546 Jps
12236 NameNode
12493 SecondaryNameNode

在通过jps查看发现有两个master，断定为dirver端有两个master导致程序出错