[ https://issues.apache.org/jira/browse/MAPREDUCE-16?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Harsh J resolved MAPREDUCE-16. ------------------------------ Resolution: Not A Problem This has gone stale, and has not been reported again recently. Was probably fixed at some point. We also do not use that particular FS anymore. > Reduce task failed at shuffling time, throwing null pointer exception > --------------------------------------------------------------------- > > Key: MAPREDUCE-16 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-16 > Project: Hadoop Map/Reduce > Issue Type: Bug > Reporter: Runping Qi > > This happened for 0.17.0 branch. > Here is the stack trace: > 2008-04-11 13:45:54,171 ERROR org.apache.hadoop.mapred.ReduceTask: Map output > copy failure: java.lang.NullPointerException > at > org.apache.hadoop.fs.InMemoryFileSystem$RawInMemoryFileSystem.getFileStatus(InMemoryFileSystem.java:302) > at > org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:242) > at > org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.copyOutput(ReduceTask.java:853) > at > org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.run(ReduceTask.java:777) -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira