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https://issues.apache.org/jira/browse/HDFS-14242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16755386#comment-16755386
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Siyao Meng commented on HDFS-14242:
-----------------------------------
Unrelated test failure org.apache.hadoop.hdfs.TestClientMetrics#testGetMetrics()
> OIV WebImageViewer: NPE when param op is not specified
> ------------------------------------------------------
>
> Key: HDFS-14242
> URL: https://issues.apache.org/jira/browse/HDFS-14242
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: tools
> Affects Versions: 3.2.0, 3.1.1
> Reporter: Siyao Meng
> Assignee: Siyao Meng
> Priority: Major
> Attachments: HDFS-14242.001.patch
>
>
> {code:bash|title=Repro. Tab 1: Start WebImageViewer}
> $ hdfs oiv -i fsimage_0000000000011467437
> 2019-01-28 23:30:20,536 INFO offlineImageViewer.FSImageHandler: Loading 6
> strings
> 2019-01-28 23:30:20,545 INFO offlineImageViewer.FSImageHandler: Loading
> 2031774 inodes.
> 2019-01-28 23:30:22,602 INFO offlineImageViewer.FSImageHandler: Loading inode
> references
> 2019-01-28 23:30:22,610 INFO offlineImageViewer.FSImageHandler: Loaded 0
> inode references
> 2019-01-28 23:30:22,610 INFO offlineImageViewer.FSImageHandler: Loading inode
> directory section
> 2019-01-28 23:30:22,739 INFO offlineImageViewer.FSImageHandler: Loaded 31758
> directories
> 2019-01-28 23:30:22,800 INFO offlineImageViewer.WebImageViewer:
> WebImageViewer started. Listening on /127.0.0.1:5978. Press Ctrl+C to stop
> the viewer.
> {code}
> {code:bash|title=Repro. Tab 2: curl /webhdfs/v1 without params}
> # NPE without op (null/empty op)
> $ curl http://127.0.0.1:5978/webhdfs/v1/
> {"RemoteException":{"exception":"NullPointerException","javaClassName":"java.lang.NullPointerException","message":null}}
> # Okay with op
> $ curl http://127.0.0.1:5978/webhdfs/v1/\?op\=LISTSTATUS
> {"FileStatuses":{"FileStatus":[
> {"owner":"hdfs","replication":0,"pathSuffix":"tmp","modificationTime":1534356863827,"childrenNum":3,"length":0,"permission":"1777","type":"DIRECTORY","blockSize":0,"accessTime":0,"group":"supergroup","fileId":16388},{"owner":"hdfs","replication":0,"pathSuffix":"user","modificationTime":1534273588466,"childrenNum":3,"length":0,"permission":"755","type":"DIRECTORY","blockSize":0,"accessTime":0,"group":"supergroup","fileId":16386}
> ]}}
> {code}
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