[jira] [Created] (CASSANDRA-5209) For small datasets/single hadoop/single cassandra clusters, ColumnFamilyRecordReader throws InvalidRequestException(why:Start token sorts after end token)

["Anton Slutsky (JIRA)" <ji...@apache.org>]

Anton Slutsky created CASSANDRA-5209:
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             Summary: For small datasets/single hadoop/single cassandra clusters, ColumnFamilyRecordReader throws InvalidRequestException(why:Start token sorts after end token)
                 Key: CASSANDRA-5209
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5209
             Project: Cassandra
          Issue Type: Bug
          Components: Hadoop
    Affects Versions: 1.2.1
         Environment: Ubuntu 12.04
            Reporter: Anton Slutsky
             Fix For: 1.2.2


When running the word count example, the following exception is thrown in most cases, but not all the time.  I have debugged through and it appears that the reason is that Partitioner implementations can get into a strange state producing splits with ranges with left value being less than minValue.  This confuses org.apache.cassandra.dht.Range.unwrap() which returns bogus ranges that start later than they finish.

java.lang.RuntimeException: InvalidRequestException(why:Start token sorts after end token)
	at org.apache.cassandra.hadoop.ColumnFamilyRecordReader$WideRowIterator.maybeInit(ColumnFamilyRecordReader.java:475)
	at org.apache.cassandra.hadoop.ColumnFamilyRecordReader$WideRowIterator.computeNext(ColumnFamilyRecordReader.java:481)
	at org.apache.cassandra.hadoop.ColumnFamilyRecordReader$WideRowIterator.computeNext(ColumnFamilyRecordReader.java:428)
	at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
	at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
	at org.apache.cassandra.hadoop.ColumnFamilyRecordReader.nextKeyValue(ColumnFamilyRecordReader.java:199)
	at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.nextKeyValue(MapTask.java:532)
	at org.apache.hadoop.mapreduce.MapContext.nextKeyValue(MapContext.java:67)
	at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:143)
	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
	at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:212)
Caused by: InvalidRequestException(why:Start token sorts after end token)
	at org.apache.cassandra.thrift.Cassandra$get_paged_slice_result.read(Cassandra.java:14168)
	at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:78)
	at org.apache.cassandra.thrift.Cassandra$Client.recv_get_paged_slice(Cassandra.java:769)
	at org.apache.cassandra.thrift.Cassandra$Client.get_paged_slice(Cassandra.java:753)
	at org.apache.cassandra.hadoop.ColumnFamilyRecordReader$WideRowIterator.maybeInit(ColumnFamilyRecordReader.java:460)
	... 11 more


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