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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-14942) DistCp#cleanup() should check whether jobFS is null
Date Wed, 11 Oct 2017 00:42:02 GMT
Ted Yu created HADOOP-14942:
-------------------------------

             Summary: 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
            Priority: Minor


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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