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From "Tanping Wang (JIRA)" <j...@apache.org>
Subject [jira] Created: (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 01:19:59 GMT
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: Bug
          Components: tools
            Reporter: Tanping Wang
            Assignee: Tanping Wang
            Priority: Minor


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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