distcp does not fail if source directory has files with missing blocks
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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 : FAILED
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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