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https://issues.apache.org/jira/browse/CASSANDRA-6793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13930873#comment-13930873
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Jonathan Ellis commented on CASSANDRA-6793:
-------------------------------------------
IMO we should come up with a separate example for that, otherwise people are
going to get the wrong idea since word count really shouldn't be that
complicated.
> NPE in Hadoop Word count example
> --------------------------------
>
> Key: CASSANDRA-6793
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6793
> Project: Cassandra
> Issue Type: Bug
> Components: Examples
> Reporter: Chander S Pechetty
> Assignee: Chander S Pechetty
> Priority: Minor
> Labels: hadoop
> Attachments: trunk-6793.txt
>
>
> The partition keys requested in WordCount.java do not match the primary key
> set up in the table output_words. It looks this patch was not merged properly
> from
> [CASSANDRA-5622|https://issues.apache.org/jira/browse/CASSANDRA-5622].The
> attached patch addresses the NPE and uses the correct keys defined in #5622.
> I am assuming there is no need to fix the actual NPE like throwing an
> InvalidRequestException back to user to fix the partition keys, as it would
> be trivial to get the same from the TableMetadata using the driver API.
> java.lang.NullPointerException
> at
> org.apache.cassandra.dht.Murmur3Partitioner.getToken(Murmur3Partitioner.java:92)
> at
> org.apache.cassandra.dht.Murmur3Partitioner.getToken(Murmur3Partitioner.java:40)
> at org.apache.cassandra.client.RingCache.getRange(RingCache.java:117)
> at
> org.apache.cassandra.hadoop.cql3.CqlRecordWriter.write(CqlRecordWriter.java:163)
> at
> org.apache.cassandra.hadoop.cql3.CqlRecordWriter.write(CqlRecordWriter.java:63)
> at
> org.apache.hadoop.mapred.ReduceTask$NewTrackingRecordWriter.write(ReduceTask.java:587)
> at
> org.apache.hadoop.mapreduce.TaskInputOutputContext.write(TaskInputOutputContext.java:80)
> at WordCount$ReducerToCassandra.reduce(Unknown Source)
> at WordCount$ReducerToCassandra.reduce(Unknown Source)
> at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:176)
> at
> org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:649)
> at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:417)
> at
> org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:260)
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