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From "Tanping Wang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-1738) change hdfs jmxget to return an empty string instead of null when an attribute value is not available.
Date Tue, 22 Mar 2011 02:08:05 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1738?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tanping Wang updated HDFS-1738:
-------------------------------

    Description: 
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 hostname.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)

  was:
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)


> 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 hostname.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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