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From "Murtaza A. Basrai (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-2049) distcp does not fail if source directory has files with missing blocks
Date Sat, 13 Oct 2007 02:21:50 GMT
distcp does not fail if source directory has files with missing blocks

                 Key: HADOOP-2049
                 URL: https://issues.apache.org/jira/browse/HADOOP-2049
             Project: Hadoop
          Issue Type: Bug
          Components: util
    Affects Versions: 0.15.0
         Environment: Nightly build: Oct 11, 2007.
            Reporter: Murtaza A. Basrai
            Priority: Critical

I copied a directory using distcp (to another directory on the same file system).

There were 9 data blocks missing in the files in the source directory, which caused distcp
to print messages like the following:

07/10/13 00:09:16 INFO mapred.JobClient:  map 1% reduce 0%
07/10/13 00:09:16 INFO mapred.JobClient: Task Id : task_200710120717_0081_m_000020_0, Status
java.io.IOException: Could not obtain block: blk_6787282547149034655 file=/srcdir/file1
        at org.apache.hadoop.dfs.DFSClient$DFSInputStream.chooseDataNode(DFSClient.java:1136)
        at org.apache.hadoop.dfs.DFSClient$DFSInputStream.blockSeekTo(DFSClient.java:988)
        at org.apache.hadoop.dfs.DFSClient$DFSInputStream.read(DFSClient.java:1094)
        at java.io.DataInputStream.read(DataInputStream.java:83)
        at org.apache.hadoop.util.CopyFiles$FSCopyFilesMapper.copy(CopyFiles.java:289)
        at org.apache.hadoop.util.CopyFiles$FSCopyFilesMapper.map(CopyFiles.java:348)
        at org.apache.hadoop.util.CopyFiles$FSCopyFilesMapper.map(CopyFiles.java:216)
        at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50)
        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:192)
        at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1753)

The corresponding tasks failed, but the retries were successful (all files with missing blocks
in the source directory were copied as empty files in the target directory).

I think that distcp should fail if it cannot successfully copy all the files (at least when
no command-line options are given).

This is critical for us as we intend to use distcp to copy databases from one dfs to another,
and if silent failures can happen then we would have to monitor each distcp manually to ensure
that it succeeded.

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