Abraham Elmahrek created MAPREDUCE-5914:
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Summary: Writables are not configured by framework
Key: MAPREDUCE-5914
URL: https://issues.apache.org/jira/browse/MAPREDUCE-5914
Project: Hadoop Map/Reduce
Issue Type: Bug
Reporter: Abraham Elmahrek
Seeing the following exception:
{noformat}
java.lang.Exception: java.lang.NullPointerException
at
org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:403)
Caused by: java.lang.NullPointerException
at
org.apache.sqoop.job.io.SqoopWritable.readFields(SqoopWritable.java:59)
at
org.apache.hadoop.io.WritableComparator.compare(WritableComparator.java:129)
at
org.apache.hadoop.mapred.MapTask$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$MapTaskRunnable.run(LocalJobRunner.java:235)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
{noformat}
It turns out that WritableComparator does not configure Writable objects
:https://github.com/apache/hadoop-common/blob/branch-2.3.0/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/WritableComparator.java.
This is during the sort phase for an MR job.
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