Spark play with WSL anaconda jupyter (2)

Last time Continuation of environment settings

• Finally trying to implement Spark RDD Helloword, *

rdd = sc.parallelize(['A', 'B', 'C', 'A'])
keyvalues = rdd.map(lambda x: (x, 1))
counts = keyvalues.reduceByKey(lambda a, b: a + b)
counts.collect()

• Error occurred !! * IllegalArgumentException: 'Unsupported class file major version 55'

• I asked Google in a hurry. *

• It seems that there was a problem with the Java version. *

(base) xxxx:~$ sudo update-alternatives --config java
alternative java (/usr/bin/Provide java)Has two choices.

Choice Path Priority Status
------------------------------------------------------------
* 0            /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111 automatic mode
  1            /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111 manual mode
  2            /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1081 manual mode

• Switch to Java 8 and select 2 in update-alternatives *

(base) xxxx:~$ sudo update-alternatives --config java
alternative java (/usr/bin/Provide java)Has two choices.

Choice Path Priority Status
------------------------------------------------------------
* 0            /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111 automatic mode
  1            /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111 manual mode
  2            /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1081 manual mode

Current choice[*]To hold<Enter>, Otherwise press the key of the choice number: 2
update-alternatives: /usr/bin/java (java)In manual mode to provide/usr/lib/jvm/java-8-openjdk-amd64/jre/bin/use java
(base) xxxx:~$ java -version
openjdk version "1.8.0_222"
OpenJDK Runtime Environment (build 1.8.0_222-8u222-b10-1ubuntu1~18.04.1-b10)
OpenJDK 64-Bit Server VM (build 25.222-b10, mixed mode)

• Jupyter restart was successful !! *

• Remarks: Not related to JAVA_HOME setting *