Github user cestella commented on the issue:

    https://github.com/apache/incubator-metron/pull/477
  
    I'm kicking travis, but it appears that there are some intermittent test 
failures in the REST API tests.  In particular around deleting topics for the 
KafkaControllerIntegrationTest:
    ```
    Tests run: 2, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 9.185 sec 
<<< FAILURE! - in 
org.apache.metron.rest.controller.KafkaControllerIntegrationTest
    test(org.apache.metron.rest.controller.KafkaControllerIntegrationTest)  
Time elapsed: 9.13 sec  <<< ERROR!
    org.springframework.web.util.NestedServletException: Request processing 
failed; nested exception is 
kafka.common.TopicAlreadyMarkedForDeletionException: topic bro is already 
marked for deletion
        at 
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982)
        at 
org.springframework.web.servlet.FrameworkServlet.doDelete(FrameworkServlet.java:894)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:654)
        at 
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
        at 
org.springframework.test.web.servlet.TestDispatcherServlet.service(TestDispatcherServlet.java:65)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
        at 
org.springframework.mock.web.MockFilterChain$ServletFilterProxy.doFilter(MockFilterChain.java:167)
        at 
org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:134)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:317)
        at 
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127)
        at 
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at 
org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:115)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at 
org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at 
org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at 
org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:169)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at 
org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at 
org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilterInternal(BasicAuthenticationFilter.java:215)
        at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at 
org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:121)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at 
org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:66)
        at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at 
org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at 
org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56)
        at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at 
org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214)
        at 
org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177)
        at 
org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:134)
        at 
org.springframework.test.web.servlet.MockMvc.perform(MockMvc.java:155)
        at 
org.apache.metron.rest.controller.KafkaControllerIntegrationTest.test(KafkaControllerIntegrationTest.java:180)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:483)
        at 
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
        at 
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
        at 
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
        at 
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
        at 
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
        at 
org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
        at 
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
        at 
org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
        at 
org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
        at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
        at 
org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:252)
        at 
org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
        at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
        at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
        at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
        at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
        at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
        at 
org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
        at 
org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
        at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
        at 
org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:283)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:173)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:153)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:128)
        at 
org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:203)
        at 
org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:155)
        at 
org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:103)
    Caused by: kafka.common.TopicAlreadyMarkedForDeletionException: topic bro 
is already marked for deletion
        at kafka.admin.AdminUtils$.deleteTopic(AdminUtils.scala:315)
        at 
org.apache.metron.rest.service.impl.KafkaServiceImpl.deleteTopic(KafkaServiceImpl.java:69)
        at 
org.apache.metron.rest.controller.KafkaController.delete(KafkaController.java:77)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:483)
        at 
org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
        at 
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)
        at 
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:114)
        at 
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
        at 
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
        at 
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
        at 
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)
        at 
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
        at 
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
        ... 71 more
    
    ```


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