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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-13496) Include file lengths in Mismatch in length error for distcp
Date Fri, 12 Aug 2016 17:38:20 GMT
Ted Yu created HADOOP-13496:
-------------------------------

             Summary: Include file lengths in Mismatch in length error for distcp
                 Key: HADOOP-13496
                 URL: https://issues.apache.org/jira/browse/HADOOP-13496
             Project: Hadoop Common
          Issue Type: Improvement
            Reporter: Ted Yu
            Priority: Minor


Currently RetriableFileCopyCommand doesn't show the perceived lengths in Mismatch in length
error:
{code}
2016-08-12 10:23:14,231 ERROR [LocalJobRunner Map Task Executor #0] util.RetriableCommand(89):
Failure in Retriable command: Copying hdfs://localhost:53941/user/tyu/test-data/dc7c674a-c463-4798-8260-
  c5d1e3440a4b/WALs/10.22.9.171,53952,1471022508087/10.22.9.171%2C53952%2C1471022508087.regiongroup-1.1471022510182
to hdfs://localhost:53941/backupUT/backup_1471022580616/WALs/10.22.9.                   171%2C53952%2C1471022508087.regiongroup-1.1471022510182
java.io.IOException: Mismatch in length of source:hdfs://localhost:53941/user/tyu/test-data/dc7c674a-c463-4798-8260-c5d1e3440a4b/WALs/10.22.9.171,53952,1471022508087/10.22.9.171%2C53952%2C1471022508087.regiongroup-1.1471022510182
and target:hdfs://localhost:53941/backupUT/backup_1471022580616/WALs/.distcp.tmp.attempt_local344329843_0006_m_000000_0
  at org.apache.hadoop.tools.mapred.RetriableFileCopyCommand.compareFileLengths(RetriableFileCopyCommand.java:193)
  at org.apache.hadoop.tools.mapred.RetriableFileCopyCommand.doCopy(RetriableFileCopyCommand.java:126)
  at org.apache.hadoop.tools.mapred.RetriableFileCopyCommand.doExecute(RetriableFileCopyCommand.java:99)
  at org.apache.hadoop.tools.util.RetriableCommand.execute(RetriableCommand.java:87)
  at org.apache.hadoop.tools.mapred.CopyMapper.copyFileWithRetry(CopyMapper.java:281)
  at org.apache.hadoop.tools.mapred.CopyMapper.map(CopyMapper.java:253)
  at org.apache.hadoop.tools.mapred.CopyMapper.map(CopyMapper.java:50)
{code}
It would be helpful to include what's the expected length and what's the real length.

Thanks to [~yzhangal] for offline discussion.



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