Provide Hadoop read access to Counter Columns.
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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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