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https://issues.apache.org/jira/browse/HDFS-17108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18029355#comment-18029355
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ASF GitHub Bot commented on HDFS-17108:
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github-actions[bot] closed pull request #6078: HDFS-17108. Null Pointer
Exception when running TestDecommissionWithBackoffMonitor
URL: https://github.com/apache/hadoop/pull/6078
> 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
> Priority: Critical
> Labels: pull-request-available
> 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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