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From "Boris Shkolnik (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1738) change hdfs jmxget to return an empty string instead of null when an attribute value is not available.
Date Wed, 09 Mar 2011 01:27:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13004325#comment-13004325
] 

Boris Shkolnik commented on HDFS-1738:
--------------------------------------

+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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