Rajiv Ramachandran created MAPREDUCE-7461:
---------------------------------------------

             Summary: Fixed assertionComparision failure by resolving xml paths 
for child elements correctly
                 Key: MAPREDUCE-7461
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7461
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: test
    Affects Versions: 3.3.6
            Reporter: Rajiv Ramachandran
             Fix For: 3.3.6


The following tests depend on underlying implementation orders which are not 
guarenteed, while comparing the contents of the generated XML response.

_org.apache.hadoop.mapreduce.v2.app.webapp.TestAMWebServicesJobs#testJobIdXML_
_org.apache.hadoop.mapreduce.v2.app.webapp.TestAMWebServicesJobs#testJobsXML_

The test attempts to send a HTTP GET request to a specific URL and expects a 
response in XML format. However, XML response order is not necessarily 
guaranteed. When comparing the the XML contents,  The `<name>` tag occurs in 
multiple places inside <job> field. However, the root element within <job> is 
not always compared due to non-deterministic order.  The  [getXmlString 
utility|https://github.com/kavvya97/hadoop/blob/trunk/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/webapp/WebServicesTestUtils.java#L78]
 always takes the first <name> tag irrespective of whether it is nested or in 
root which causes the test to become flaky.




[ERROR] Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 8.377 s 
<<< FAILURE! - in 
org.apache.hadoop.mapreduce.v2.app.webapp.TestAMWebServicesJobs
[ERROR] 
testJobIdXML(org.apache.hadoop.mapreduce.v2.app.webapp.TestAMWebServicesJobs)  
Time elapsed: 8.361 s  <<< FAILURE!
java.lang.AssertionError:
[name]
Expecting:
 "mapreduce.job.acl-view-job"
to match pattern:
 "RandomWriter"




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