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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