lijuanhzou created MAPREDUCE-5271: ------------------------------------- Summary: Error: org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError: error in shuffle in InMemoryMerger - Thread to merge in-memory shuffled map-outputs Key: MAPREDUCE-5271 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5271 Project: Hadoop Map/Reduce Issue Type: Bug Components: jobtracker Affects Versions: 2.0.0-alpha Environment: linux 64 Reporter: lijuanhzou Assignee: lijuanhzou
(hadoop-2.0.0-cdh4.2.0)I encounter following question when do a simple words-count working.small input data is ok,there is problem when using big datas: Error: org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError: error in shuffle in InMemoryMerger - Thread to merge in-memory shuffled map-outputs at org.apache.hadoop.mapreduce.task.reduce.Shuffle.run(Shuffle.java:121) at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:379) at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:157) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:396) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1408) at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:152) Caused by: java.lang.ClassCastException: org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl$CompressAwarePath cannot be cast to java.lang.Comparable at java.util.TreeMap.put(TreeMap.java:542) at java.util.TreeSet.add(TreeSet.java:238) at org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl.closeOnDiskFile(MergeManagerImpl.java:340) at org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl$InMemoryMerger.merge(MergeManagerImpl.java:495) at org.apache.hadoop.mapreduce.task.reduce.MergeThread.run(MergeThread.java:94) -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira