[HADOOP-13024] Distcp with -delete feature on raw data not implemented

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.6.0
• Fix Version/s: 2.8.0, 3.0.0-alpha2
• Component/s: tools/distcp
• Hadoop Flags: Reviewed
• Assignee: Mavin Martin
• Reporter: Mavin Martin
• Created: 14/Apr/16 02:56
• Updated: 20/Mar/18 03:35
• Resolved: 13/Oct/16 20:29

Description

When doing distcp of raw data using -delete feature, following bug appears.

[root@xxx bin]# hadoop distcp -delete -update /.reserved/raw/tmp/a /.reserved/raw/tmp/b
16/04/14 02:54:01 ERROR tools.DistCp: Exception encountered
java.io.IOException: DistCp failure: Job job_xxx has failed: Job commit failed: org.apache.hadoop.tools.CopyListing$InvalidInputException: The source path 'hdfs://nn/.reserved/raw/tmp/b' starts with /.reserved/raw but the target path 'hdfs://nn/NONE' does not. Either all or none of the paths must have this prefix.
        at org.apache.hadoop.tools.SimpleCopyListing.validatePaths(SimpleCopyListing.java:141)
        at org.apache.hadoop.tools.CopyListing.buildListing(CopyListing.java:85)
        at org.apache.hadoop.tools.GlobbedCopyListing.doBuildListing(GlobbedCopyListing.java:90)
        at org.apache.hadoop.tools.CopyListing.buildListing(CopyListing.java:86)
        at org.apache.hadoop.tools.mapred.CopyCommitter.deleteMissing(CopyCommitter.java:244)
        at org.apache.hadoop.tools.mapred.CopyCommitter.commitJob(CopyCommitter.java:94)
        at org.apache.hadoop.mapreduce.v2.app.commit.CommitterEventHandler$EventProcessor.handleJobCommit(CommitterEventHandler.java:274)
        at org.apache.hadoop.mapreduce.v2.app.commit.CommitterEventHandler$EventProcessor.run(CommitterEventHandler.java:237)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)


        at org.apache.hadoop.tools.DistCp.execute(DistCp.java:187)
        at org.apache.hadoop.tools.DistCp.run(DistCp.java:122)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
        at org.apache.hadoop.tools.DistCp.main(DistCp.java:429)

The issue is not with the distributed copy, the issue is when it tries to delete things in the target that no longer exist in the source, it revalidates to make sure NONE is in the /.reserved/raw domain.