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https://issues.apache.org/jira/browse/HADOOP-14942?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran updated HADOOP-14942:
------------------------------------
Resolution: Fixed
Fix Version/s: 3.0.0
2.9.0
Status: Resolved (was: Patch Available)
> DistCp#cleanup() should check whether jobFS is null
> ---------------------------------------------------
>
> Key: HADOOP-14942
> URL: https://issues.apache.org/jira/browse/HADOOP-14942
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Ted Yu
> Assignee: Andras Bokor
> Priority: Minor
> Fix For: 2.9.0, 3.0.0
>
> Attachments: HADOOP-14942.01.patch
>
>
> Over in HBASE-18975, we observed the following:
> {code}
> 2017-10-10 17:22:53,211 DEBUG [main] mapreduce.MapReduceBackupCopyJob(313):
> Doing COPY_TYPE_DISTCP
> 2017-10-10 17:22:53,272 DEBUG [main] mapreduce.MapReduceBackupCopyJob(322):
> DistCp options: [hdfs://localhost:55247/backupUT/.tmp/backup_1507681285309,
> hdfs://localhost:55247/ backupUT]
> 2017-10-10 17:22:53,283 ERROR [main] tools.DistCp(167): Exception encountered
> java.lang.reflect.InvocationTargetException
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.apache.hadoop.hbase.backup.mapreduce.MapReduceBackupCopyJob$BackupDistCp.execute(MapReduceBackupCopyJob.java:234)
> at org.apache.hadoop.tools.DistCp.run(DistCp.java:153)
> at
> org.apache.hadoop.hbase.backup.mapreduce.MapReduceBackupCopyJob.copy(MapReduceBackupCopyJob.java:331)
> at
> org.apache.hadoop.hbase.backup.impl.IncrementalTableBackupClient.incrementalCopyHFiles(IncrementalTableBackupClient.java:286)
> ...
> Caused by: java.lang.NullPointerException
> at org.apache.hadoop.tools.DistCp.cleanup(DistCp.java:460)
> ... 45 more
> {code}
> NullPointerException came from second line below:
> {code}
> if (metaFolder == null) return;
> jobFS.delete(metaFolder, true);
> {code}
> in which case jobFS was null.
> A check against null should be added.
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