hadoop-common-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Ravi Gummadi (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-6072) distcp should place the file distcp_src_files in distributed cache
Date Wed, 17 Jun 2009 19:54:07 GMT
distcp should place the file distcp_src_files in distributed cache
------------------------------------------------------------------

                 Key: HADOOP-6072
                 URL: https://issues.apache.org/jira/browse/HADOOP-6072
             Project: Hadoop Core
          Issue Type: Improvement
          Components: tools/distcp
    Affects Versions: 0.21.0
            Reporter: Ravi Gummadi
             Fix For: 0.21.0


When large number of files are being copied by distcp, accessing distcp_src_files seems to
be an issue, as all map tasks would be accessing this file. The error message seen is:

09/06/16 10:13:16 INFO mapred.JobClient: Task Id : attempt_200906040559_0110_m_003348_0, Status
: FAILED
java.io.IOException: Could not obtain block: blk_-4229860619941366534_1500174
file=/mapredsystem/hadoop/mapredsystem/distcp_7fiyvq/_distcp_src_files
        at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.chooseDataNode(DFSClient.java:1757)
        at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.blockSeekTo(DFSClient.java:1585)
        at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.read(DFSClient.java:1712)
        at java.io.DataInputStream.readFully(DataInputStream.java:178)
        at java.io.DataInputStream.readFully(DataInputStream.java:152)
        at org.apache.hadoop.io.SequenceFile$Reader.init(SequenceFile.java:1450)
        at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1428)
        at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1417)
        at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1412)
        at org.apache.hadoop.mapred.SequenceFileRecordReader.<init>(SequenceFileRecordReader.java:43)
        at org.apache.hadoop.tools.DistCp$CopyInputFormat.getRecordReader(DistCp.java:299)
        at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:336)
        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305)
        at org.apache.hadoop.mapred.Child.main(Child.java:170)


This could be because of HADOOP-6038 and/or HADOOP-4681.

If distcp places this special file distcp_src_files in distributed cache, that could solve
the problem.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message