It seems the files cannot be validated for some reason. The source files are fine, not corrupt and can be read without issues.
java.io.IOException: Validation of copy of file hftp://namenode01.openindex.io:50070/user/systems/segments/index/20111021161228/crawl_parse/part-00011 failed. at org.apache.hadoop.tools.DistCp$CopyFilesMapper.copy(DistCp.java:540) at org.apache.hadoop.tools.DistCp$CopyFilesMapper.copyWithRetries(DistCp.java:595) at org.apache.hadoop.tools.DistCp$CopyFilesMapper.map(DistCp.java:651) at org.apache.hadoop.tools.DistCp$CopyFilesMapper.map(DistCp.java:325) at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:54) at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:389) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:322) at org.apache.hadoop.mapred.Child$4.run(Child.java:223) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:396) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1153) at org.apache.hadoop.mapred.Child.main(Child.java:217) When i retry some will be copied but most will fail. At a third retry all will fail or be skipped. I also found MAPREDUE-2406 [1] and gave -pb a try, i can confirm this solves the problem. [1] : https://issues.apache.org/jira/browse/MAPREDUCE-2406 On Monday 19 December 2011 09:22:39 Markus Jelsma wrote: > Hi, > > Apologies for cross-posting. > > We're in the process of migrating data from an Apache Hadoop 0.20.203.0 > cluster to a 0.22.0 cluster using distcp with a hftp source and hdfs dest > as described in the manual. During the copy a handful of the following > cryptic IOExceptions occured and the job finally failed completely. Almost > 20GB of data was not copied at all. > > 11/12/18 22:50:53 INFO mapreduce.Job: Task Id : > attempt_201112181848_0007_m_000097_0, Status : FAILED > java.io.IOException: Copied: 251 Skipped: 0 Failed: 16 > at > org.apache.hadoop.tools.DistCp$CopyFilesMapper.close(DistCp.java:694) > at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:61) > at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:389) > at org.apache.hadoop.mapred.MapTask.run(MapTask.java:322) > at org.apache.hadoop.mapred.Child$4.run(Child.java:223) > at java.security.AccessController.doPrivileged(Native Method) > at javax.security.auth.Subject.doAs(Subject.java:396) > at > org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.j > ava:1153) at org.apache.hadoop.mapred.Child.main(Child.java:217) > > The files being copied do not contain any fancy filenames and are all map > or sequence files with an occasional _SUCCESS file here and there. The > cryptic stack trace is similar to some CDH issue [1] which is still open. > Any thoughts? > > [1]: https://issues.cloudera.org/browse/DISTRO-347 > > > Thanks
