[HDFS-7818] OffsetParam should return the default value instead of throwing NPE when the value is unspecified

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 2.7.0
• Fix Version/s: 2.7.0
• Component/s: webhdfs
• Target Version/s: 2.7.0
• Hadoop Flags: Reviewed
• Assignee: Eric Payne
• Reporter: Eric Payne
• Created: 21/Feb/15 17:07
• Updated: 14/Oct/19 15:38
• Resolved: 06/Mar/15 22:27

Description

This is a regression in 2.7 and later.

hadoop fs -cat over webhdfs works, but hadoop fs -text does not:

$ hadoop fs -cat webhdfs://myhost.com/tmp/test.1
... output ...

$ hadoop fs -text webhdfs://myhost.com/tmp/test.1
text: org.apache.hadoop.ipc.RemoteException(java.lang.NullPointerException): null
	at org.apache.hadoop.hdfs.web.JsonUtil.toRemoteException(JsonUtil.java:165)
	at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.validateResponse(WebHdfsFileSystem.java:358)
	at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.access$200(WebHdfsFileSystem.java:91)
	at org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.runWithRetry(WebHdfsFileSystem.java:615)
	at org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.access$100(WebHdfsFileSystem.java:463)
	at org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner$1.run(WebHdfsFileSystem.java:492)
...

Issue Links

• is broken by: HDFS-7279 Use netty to implement DatanodeWebHdfsMethods
• relates to: HDFS-7901 Fix findbug warning in org.apache.hadoop.hdfs.web.resources.OffsetParam.getOffset()