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https://issues.apache.org/jira/browse/HADOOP-10686?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Karthik Kambatla reopened HADOOP-10686:
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Looks like I messed up backporting to branch-2.
> Writables are not always configured
> -----------------------------------
>
> Key: HADOOP-10686
> URL: https://issues.apache.org/jira/browse/HADOOP-10686
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 2.4.0
> Reporter: Abraham Elmahrek
> Assignee: Abraham Elmahrek
> Fix For: 2.5.0
>
> Attachments: MAPREDUCE-5914.0.patch, MAPREDUCE-5914.1.patch,
> MAPREDUCE-5914.2.patch
>
>
> 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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