A sysproperty should not be set unless the property is set on the ant command 
line in build.xml.
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                 Key: HADOOP-6131
                 URL: https://issues.apache.org/jira/browse/HADOOP-6131
             Project: Hadoop Common
          Issue Type: Bug
          Components: build
    Affects Versions: 0.21.0
            Reporter: Hong Tang
            Priority: Trivial


Patch for HADOOP-3315 contains an improper usage of setting a sysproperty. What 
it does now:
{code}
      <sysproperty key="io.compression.codec.lzo.class"
          value="${io.compression.codec.lzo.class}"/>
{code}
What should be:
{code} 
     <syspropertyset dynamic="no">
         <propertyref name="io.compression.codec.lzo.class"/>
      </syspropertyset>
{code}

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