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From "Aaron Morton (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-2981) Provide Hadoop read access to Counter Columns.
Date Mon, 01 Aug 2011 03:49:09 GMT
Provide Hadoop read access to Counter Columns.
----------------------------------------------

                 Key: CASSANDRA-2981
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2981
             Project: Cassandra
          Issue Type: Improvement
          Components: Hadoop
    Affects Versions: 0.8.2
            Reporter: Aaron Morton
            Assignee: Aaron Morton
            Priority: Minor


o.a.c.Hadoop.ColumnFamilyRecordReader does not test for counter columns, which are different
objects in the ColumnOrSuperColumn struct. Currently it raises an error as it thinks it's
a super column 

{code:java}
2011-07-26 17:23:34,376 ERROR CliDriver (SessionState.java:printError(343)) - Failed with
exception java.io.IOException:java.lang.NullPointerException
java.io.IOException: java.lang.NullPointerException
	at org.apache.hadoop.hive.ql.exec.FetchOperator.getNextRow(FetchOperator.java:341)
	at org.apache.hadoop.hive.ql.exec.FetchTask.fetch(FetchTask.java:133)
	at org.apache.hadoop.hive.ql.Driver.getResults(Driver.java:1114)
	at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:187)
	at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:241)
	at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:456)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
Caused by: java.lang.NullPointerException
	at org.apache.cassandra.hadoop.ColumnFamilyRecordReader$RowIterator.unthriftifySuper(ColumnFamilyRecordReader.java:303)
	at org.apache.cassandra.hadoop.ColumnFamilyRecordReader$RowIterator.unthriftify(ColumnFamilyRecordReader.java:297)
	at org.apache.cassandra.hadoop.ColumnFamilyRecordReader$RowIterator.computeNext(ColumnFamilyRecordReader.java:288)
	at org.apache.cassandra.hadoop.ColumnFamilyRecordReader$RowIterator.computeNext(ColumnFamilyRecordReader.java:177)
	at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:140)
	at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:135)
	at org.apache.cassandra.hadoop.ColumnFamilyRecordReader.nextKeyValue(ColumnFamilyRecordReader.java:136)
	at org.apache.hadoop.hive.cassandra.input.HiveCassandraStandardColumnInputFormat$2.next(HiveCassandraStandardColumnInputFormat.java:153)
	at org.apache.hadoop.hive.cassandra.input.HiveCassandraStandardColumnInputFormat$2.next(HiveCassandraStandardColumnInputFormat.java:111)
	at org.apache.hadoop.hive.ql.exec.FetchOperator.getNextRow(FetchOperator.java:326)
	... 10 more
{code}

My plan is to return o.a.c.db.CounterColumn objects just like the o.a.c.db.Column and SuperColumn
that are returned.


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