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https://issues.apache.org/jira/browse/HDFS-1738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13004325#comment-13004325
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Boris Shkolnik commented on HDFS-1738:
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+1
> change hdfs jmxget to return an empty string instead of null when an
> attribute value is not available.
> ------------------------------------------------------------------------------------------------------
>
> Key: HDFS-1738
> URL: https://issues.apache.org/jira/browse/HDFS-1738
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: tools
> Reporter: Tanping Wang
> Assignee: Tanping Wang
> Priority: Minor
> Attachments: HDFS-1738.patch
>
>
> Currently the tool, hdfs jmx returns null in case of an attribute value is
> not available. A null pointer exception is thrown and the value of the rest
> attributes are not printed. It makes more sense to return an empty string
> and continue to print out the values for the rest attributes.
> Example of current behavior
> $ hdfs jmxget -server gsbl90629.blue.ygrid.yahoo.com -port 8004 -service
> NameNode,name=NameNodeActivity
> >>>>>>>>jmx name: name=NameNodeActivity,service=NameNode
> tag.ProcessName=NameNode
> java.lang.NullPointerException
> at org.apache.hadoop.hdfs.tools.JMXGet.printAllValues(JMXGet.java:106)
> at org.apache.hadoop.hdfs.tools.JMXGet.main(JMXGet.java:329)
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