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https://issues.apache.org/jira/browse/HADOOP-1675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12517691
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Devaraj Das commented on HADOOP-1675:
-------------------------------------
I verified from the logs that what I said earlier is indeed the case.
> Null pointer exception in InMemoryFileSystem
> --------------------------------------------
>
> Key: HADOOP-1675
> URL: https://issues.apache.org/jira/browse/HADOOP-1675
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.13.0
> Reporter: Runping Qi
>
> In a job running release .13, I saw a lot of failures due to the following
> errors:
> 2007-08-03 16:13:39,516 ERROR org.apache.hadoop.mapred.ReduceTask: Map output
> copy failure: java.lang.NullPointerException
> at
> org.apache.hadoop.fs.InMemoryFileSystem$RawInMemoryFileSystem.reserveSpace(InMemoryFileSystem.java:361)
> at
> org.apache.hadoop.fs.InMemoryFileSystem.reserveSpaceWithCheckSum(InMemoryFileSystem.java:474)
> at
> org.apache.hadoop.mapred.MapOutputLocation.getFile(MapOutputLocation.java:220)
> at
> org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.copyOutput(ReduceTask.java:680)
> at
> org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.run(ReduceTask.java:641)
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