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https://issues.apache.org/jira/browse/HDFS-13868?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HDFS-13868 started by Pranay Singh.
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> WebHDFS: GETSNAPSHOTDIFF API NPE when param "snapshotname" is given but 
> "oldsnapshotname" is not.
> -------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-13868
>                 URL: https://issues.apache.org/jira/browse/HDFS-13868
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: webhdfs
>    Affects Versions: 3.1.0, 3.0.3
>            Reporter: Siyao Meng
>            Assignee: Pranay Singh
>            Priority: Major
>         Attachments: HDFS-13868.001.patch
>
>
> HDFS-13052 implements GETSNAPSHOTDIFF for WebHDFS.
>  
> Proof:
> {code:java}
> # Bash
> # Prerequisite: You will need to create the directory "/snapshot", 
> allowSnapshot() on it, and create a snapshot named "snap3" for it to reach 
> NPE.
> $ curl 
> "http://<SERVER>:<PORT>/webhdfs/v1/snaptest/?op=GETSNAPSHOTDIFF&user.name=hdfs&oldsnapshotnameZZZ=snap2&snapshotname=snap3"
> # Note that I intentionally typed the wrong parameter name for 
> "oldsnapshotname" above to cause NPE.
> {"RemoteException":{"exception":"NullPointerException","javaClassName":"java.lang.NullPointerException","message":null}}
> # OR
> $ curl 
> "http://<SERVER>:<PORT>/webhdfs/v1/snaptest/?op=GETSNAPSHOTDIFF&user.name=hdfs&oldsnapshotname=&snapshotname=snap3"
> # Empty string for oldsnapshotname
> {"RemoteException":{"exception":"NullPointerException","javaClassName":"java.lang.NullPointerException","message":null}}
> # OR
> $ curl 
> "http://<SERVER>:<PORT>/webhdfs/v1/snaptest/?op=GETSNAPSHOTDIFF&user.name=hdfs&snapshotname=snap3"
> # Missing param oldsnapshotname, essentially the same as the first case.
> {"RemoteException":{"exception":"NullPointerException","javaClassName":"java.lang.NullPointerException","message":null}{code}



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