Cannot read cassandra column family on a spark cluster using the spark-cassandra-connector in java -


here code read column family using spark cassandra connector

import static com.datastax.spark.connector.japi.cassandrajavautil.*;  import com.datastax.spark.connector.japi.sparkcontextjavafunctions; import org.apache.spark.sparkconf; import org.apache.spark.sparkcontext; import org.apache.spark.api.java.javardd;  public class main {     private static final string host = "spark://sparkmaster:7077"; //    private static final string host = "local[4]";      private static final string app_name = "cassandra spark wordcount";      public static void main (string... args) {         string[] jars = {                 "./build/libs/cassandrasparkmapreduce-1.0-snapshot.jar"         };          sparkconf conf = new sparkconf(true)                 .set("spark.cassandra.connection.host", "107.108.214.154")                 .set("spark.executor.userclasspathfirst", "true")                 .setjars(jars);          sparkcontext sc = new sparkcontext(host, app_name, conf);         sparkcontextjavafunctions context = javafunctions(sc);          javardd<string> rdd = context.cassandratable("wordcount", "input")                 .map(row -> row.tostring());          system.out.println(rdd.toarray());     } }

and here build.gradle file build , run application

group 'in.suyash.tests' version '1.0-snapshot'  apply plugin: 'java' apply plugin: 'application'  sourcecompatibility = 1.8  repositories {     mavencentral() }  dependencies {     compile group: 'org.apache.spark', name: 'spark-core_2.10', version: '1.4.0'      compile group: 'com.datastax.spark', name: 'spark-cassandra-connector_2.10', version: '1.4.0-m1'     compile group: 'com.datastax.spark', name: 'spark-cassandra-connector-java_2.10', version: '1.4.0-m1'      testcompile group: 'junit', name: 'junit', version: '4.11' }  sourcesets {     main {         java {             srcdir './'         }     } }  mainclassname = 'main'  // http://stackoverflow.com/a/14441628/3673043 jar {     dofirst {         {             configurations.compile.collect {                 it.isdirectory() ? : ziptree(it)             }         }     }     exclude 'meta-inf/*.rsa', 'meta-inf/*.sf','meta-inf/*.dsa' }

i execute job first doing gradle build build jar, , gradle run. job fails, , looking @ stderr in executors, getting following exception

java.lang.classcastexception: org.apache.spark.scheduler.resulttask cannot cast org.apache.spark.scheduler.task     @ org.apache.spark.executor.executor$taskrunner.run(executor.scala:194)     @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1142)     @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:617)     @ java.lang.thread.run(thread.java:745)

i have 3 node setup, in 1 node acts spark master node, while other 2 spark worker nodes , form cassandra ring. can execute job locally, if change spark host, on cluster getting weird exception, cannot find anywhere else. versions:

  • spark: 1.4.0
  • cassandra: 2.1.6
  • spark-cassandra-connector: 1.4.0-m1


edit

i can't answer how resolved this, removed java installations nodes, restarted , installed fresh copy of jdk1.8.0_45, started cluster again, , job completes successfully. explanations behaviour welcome.


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