java.lang.IncompatibleClassChangeError

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  • Using Hadoop 0.22.0 with Cassandra results in the stack trace below. It appears that version 0.21+ changed org.apache.hadoop.mapreduce.JobContext from a class to an interface. Exception in thread "main" java.lang.IncompatibleClassChangeError: Found interface org.apache.hadoop.mapreduce.JobContext, but class was expected at org.apache.cassandra.hadoop.ColumnFamilyInputFormat.getSplits(ColumnFamilyInputFormat.java:103) at org.apache.hadoop.mapreduce.JobSubmitter.writeNewSplits(JobSubmitter.java:445) at org.apache.hadoop.mapreduce.JobSubmitter.writeSplits(JobSubmitter.java:462) at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:357) at org.apache.hadoop.mapreduce.Job$2.run(Job.java:1045) at org.apache.hadoop.mapreduce.Job$2.run(Job.java:1042) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:415) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1153) at org.apache.hadoop.mapreduce.Job.submit(Job.java:1042) at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1062) at MyHadoopApp.run(MyHadoopApp.java:163) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:69) at MyHadoopApp.main(MyHadoopApp.java:82) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.apache.hadoop.util.RunJar.main(RunJar.java:192)
    via by Brian Jeltema,
  • Using Hadoop 0.22.0 with Cassandra results in the stack trace below. It appears that version 0.21+ changed org.apache.hadoop.mapreduce.JobContext from a class to an interface. Exception in thread "main" java.lang.IncompatibleClassChangeError: Found interface org.apache.hadoop.mapreduce.JobContext, but class was expected at org.apache.cassandra.hadoop.ColumnFamilyInputFormat.getSplits(ColumnFamilyInputFormat.java:103) at org.apache.hadoop.mapreduce.JobSubmitter.writeNewSplits(JobSubmitter.java:445) at org.apache.hadoop.mapreduce.JobSubmitter.writeSplits(JobSubmitter.java:462) at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:357) at org.apache.hadoop.mapreduce.Job$2.run(Job.java:1045) at org.apache.hadoop.mapreduce.Job$2.run(Job.java:1042) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:415) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1153) at org.apache.hadoop.mapreduce.Job.submit(Job.java:1042) at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1062) at MyHadoopApp.run(MyHadoopApp.java:163) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:69) at MyHadoopApp.main(MyHadoopApp.java:82) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.apache.hadoop.util.RunJar.main(RunJar.java:192)
    via by Brian Jeltema,
  • Can't Run Spark CassandraTest Example
    via Stack Overflow by kelloti
    ,
    • java.lang.IncompatibleClassChangeError: Found interface org.apache.hadoop.mapreduce.JobContext, but class was expected at org.apache.cassandra.hadoop.AbstractColumnFamilyInputFormat.getSplits(AbstractColumnFamilyInputFormat.java:115)

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