[jira] [Created] (HDFS-17108) Null Pointer Exception when running TestDecommissionWithBackoffMonitor

["ConfX (Jira)" <ji...@apache.org>]

ConfX created HDFS-17108:
----------------------------

             Summary: Null Pointer Exception when running TestDecommissionWithBackoffMonitor
                 Key: HDFS-17108
                 URL: https://issues.apache.org/jira/browse/HDFS-17108
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: ConfX
         Attachments: reproduce.sh

h2. What happened

After setting {{{}dfs.client.read.shortcircuit=true{}}}, running test {{org.apache.hadoop.hdfs.TestDecommissionWithBackoffMonitor#testNodeUsageWhileDecommissioining}} results in a {{{}NullPointerException{}}}.
h2. Where's the bug

In the test class {{{}org.apache.hadoop.hdfs.TestDecommission{}}}:
{noformat}
    } finally {
      cleanupFile(fileSys, file1);
    }{noformat}
However, the class does not check if the fileSys is null, causing the NPE.
h2. How to reproduce
 # Set {{dfs.client.read.shortcircuit=true}}
 # Run {{org.apache.hadoop.hdfs.TestDecommissionWithBackoffMonitor#testNodeUsageWhileDecommissioining}}
and the following exception should be observed:
{noformat}
java.lang.NullPointerException
    at org.apache.hadoop.hdfs.AdminStatesBaseTest.cleanupFile(AdminStatesBaseTest.java:459)
    at org.apache.hadoop.hdfs.TestDecommission.nodeUsageVerification(TestDecommission.java:1575)
    at org.apache.hadoop.hdfs.TestDecommission.testNodeUsageWhileDecommissioining(TestDecommission.java:1510){noformat}
For an easy reproduction, run the reproduce.sh in the attachment.

We are happy to provide a patch if this issue is confirmed.



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