Hi All.
I am writing a test example of mapreduce using orc.
NullPointerException during runtime.
java.lang.Exception: java.lang.NullPointerException
at
org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:403)
Caused by: java.lang.NullPointerException
at org.apache.orc.mapred.OrcKey.readFields(OrcKey.java:57)
at
org.apache.hadoop.io.WritableComparator.compare(WritableComparator.java:129)
at
org.apache.hadoop.mapred.MapTask$MapOutputBuffer.compare(MapTask.java:1248)
at org.apache.hadoop.util.QuickSort.fix(QuickSort.java:35)
at org.apache.hadoop.util.QuickSort.sortInternal(QuickSort.java:87)
at org.apache.hadoop.util.QuickSort.sort(QuickSort.java:63)
at
org.apache.hadoop.mapred.MapTask$MapOutputBuffer.sortAndSpill(MapTask.java:1582)
at
org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:1467)
at
org.apache.hadoop.mapred.MapTask$NewOutputCollector.close(MapTask.java:699)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:769)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:339)
at
org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:235)
The variable key inside OrcKey is not init. Analysis revealed a bug in
hadoop-common that was fixed in version 2.5.0.
https://issues.apache.org/jira/browse/HADOOP-10686
https://github.com/apache/hadoop/commit/fc7c8f9bf2588fd25f8b457ee4a9b444e619519c
Do we need to change min.hadoop.version to the ORC-mapreduce module ?
Is there a remedy for this?
Best,
Yiqun Zhang
