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Posted to common-dev@hadoop.apache.org by "Ravi Gummadi (JIRA)" <ji...@apache.org> on 2009/06/19 13:59:07 UTC
[jira] Updated: (HADOOP-6072) distcp should place the file
distcp_src_files in distributed cache
[ https://issues.apache.org/jira/browse/HADOOP-6072?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ravi Gummadi updated HADOOP-6072:
---------------------------------
Attachment: d_replica_srcfilelist.patch
Attaching patch for increasing the replication of _distcp_src_files to sqrt(maxMapsOnCluster).
Please review and provide your comments.
> 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
> Assignee: Ravi Gummadi
> Fix For: 0.21.0
>
> Attachments: d_replica_srcfilelist.patch
>
>
> 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.
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