[ORC-964] OrcKey / OrcValue NullPointerException during MapReduce shuffle

• Type: Bug
• Status: Reopened
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.7.0
• Component/s: Java, MapReduce
• Assignee: Unassigned
• Reporter: Yiqun Zhang
• Created: 23/Aug/21 09:30
• Updated: 07/Sep/21 16:12

Description

I am writing unit tests for ORC-715 
There is a NullPointerException that cannot be passed

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?
 

Issue Links

• relates to: HADOOP-10686 Writables are not always configured