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https://issues.apache.org/jira/browse/HADOOP-13496?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ted Yu updated HADOOP-13496:
----------------------------
Labels: distcp (was: )
> 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
> Labels: distcp
> Attachments: HADOOP-13496.v1.patch
>
>
> 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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