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https://issues.apache.org/jira/browse/HDFS-13868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16598310#comment-16598310
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Wei-Chiu Chuang commented on HDFS-13868:
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I'm not sure why, but this Jira doesn't allow me to submit the patch file for
precommit test.
Looks like the NPE is caused by snapshotdiff code within NameNode, not webhdfs?
Interesting. Since you were able to find the source of NPE, would you please
make a test case to reproduce the bug?
> 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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