Hadoop-Mapreduce-trunk-Java8 - Build # 256 - Failure

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See https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Java8/256/

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[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO] 
[INFO] Apache Hadoop MapReduce Client .................... SUCCESS [  2.392 s]
[INFO] Apache Hadoop MapReduce Core ...................... FAILURE [01:26 min]
[INFO] Apache Hadoop MapReduce Common .................... SKIPPED
[INFO] Apache Hadoop MapReduce Shuffle ................... SKIPPED
[INFO] Apache Hadoop MapReduce App ....................... SKIPPED
[INFO] Apache Hadoop MapReduce HistoryServer ............. SKIPPED
[INFO] Apache Hadoop MapReduce JobClient ................. SKIPPED
[INFO] Apache Hadoop MapReduce HistoryServer Plugins ..... SKIPPED
[INFO] Apache Hadoop MapReduce NativeTask ................ SKIPPED
[INFO] Apache Hadoop MapReduce Examples .................. SKIPPED
[INFO] Apache Hadoop MapReduce ........................... SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 01:30 min
[INFO] Finished at: 2015-07-17T13:09:34+00:00
[INFO] Final Memory: 34M/259M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.17:test (default-test) on project hadoop-mapreduce-client-core: There are test failures.
[ERROR] 
[ERROR] Please refer to /home/jenkins/jenkins-slave/workspace/Hadoop-Mapreduce-trunk-Java8/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/target/surefire-reports for the individual test results.
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
[ERROR] 
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR]   mvn <goals> -rf :hadoop-mapreduce-client-core
Build step 'Execute shell' marked build as failure
[FINDBUGS] Skipping publisher since build result is FAILURE
Archiving artifacts
Sending artifact delta relative to Hadoop-Mapreduce-trunk-Java8 #255
Archived 1 artifacts
Archive block size is 32768
Received 0 blocks and 20453762 bytes
Compression is 0.0%
Took 5.7 sec
Recording test results
Updating HADOOP-10979
Updating YARN-3805
Updating YARN-3174
Updating HADOOP-12240
Updating YARN-3535
Updating YARN-3930
Updating YARN-90
Updating HDFS-8778
Updating YARN-3885
Updating HDFS-8767
Updating HDFS-7314
Updating HADOOP-10615
Email was triggered for: Failure
Sending email for trigger: Failure



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############################## FAILED TESTS (if any) ##############################
1 tests failed.
REGRESSION:  org.apache.hadoop.mapred.TestJobEndNotifier.testNotificationTimeout

Error Message:
null

Stack Trace:
junit.framework.AssertionFailedError: null
	at junit.framework.Assert.fail(Assert.java:55)
	at junit.framework.Assert.assertTrue(Assert.java:22)
	at junit.framework.Assert.assertTrue(Assert.java:31)
	at junit.framework.TestCase.assertTrue(TestCase.java:201)
	at org.apache.hadoop.mapred.TestJobEndNotifier.testNotificationTimeout(TestJobEndNotifier.java:182)