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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