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Date: Fri, 20 Oct 2017 21:30:00 +0000 (UTC)
From: "Steve Loughran (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HADOOP-14942) DistCp#cleanup() should check
 whether jobFS is null
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archived-at: Fri, 20 Oct 2017 21:30:04 -0000


     [ https://issues.apache.org/jira/browse/HADOOP-14942?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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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