Colin Patrick McCabe created HDFS-4283:
------------------------------------------

             Summary: Spurious Test failures in TestEditLog.testFuzzSequences
                 Key: HDFS-4283
                 URL: https://issues.apache.org/jira/browse/HDFS-4283
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: test
    Affects Versions: 2.0.3-alpha
            Reporter: Colin Patrick McCabe
            Assignee: Colin Patrick McCabe
            Priority: Minor


testFuzzSequences fails sometimes due to the additional UTF-8 validation added 
in HADOOP-9103.  The issue is that the UTF8 class throws its exceptions as 
{{RuntimeExceptions}} rather than {{IOExceptions}}, and the fuzzing code is not 
expecting that.

Example failure:
{code}
Failed

org.apache.hadoop.hdfs.server.namenode.TestEditLog.testFuzzSequences
Failing for the past 5 builds (Since Failed#3600 )
Took 4.8 sec.
Error Message

Caught non-IOException throwable java.lang.RuntimeException: 
java.io.IOException: Invalid UTF8 at 9871b370d70a  at 
org.apache.hadoop.io.UTF8.toString(UTF8.java:154)  at 
org.apache.hadoop.hdfs.server.namenode.FSImageSerialization.readString(FSImageSerialization.java:200)
  at 
org.apache.hadoop.hdfs.server.namenode.FSEditLogOp$TimesOp.readFields(FSEditLogOp.java:1439)
  at 
org.apache.hadoop.hdfs.server.namenode.FSEditLogOp$Reader.decodeOp(FSEditLogOp.java:2399)
  at 
org.apache.hadoop.hdfs.server.namenode.FSEditLogOp$Reader.readOp(FSEditLogOp.java:2290)
  at 
org.apache.hadoop.hdfs.server.namenode.EditLogFileInputStream.nextOpImpl(EditLogFileInputStream.java:177)
  at 
org.apache.hadoop.hdfs.server.namenode.EditLogFileInputStream.nextOpImpl(EditLogFileInputStream.java:175)
  at 
org.apache.hadoop.hdfs.server.namenode.EditLogFileInputStream.nextOp(EditLogFileInputStream.java:217)
  at 
org.apache.hadoop.hdfs.server.namenode.EditLogInputStream.readOp(EditLogInputStream.java:72)
  at 
org.apache.hadoop.hdfs.server.namenode.TestEditLog.validateNoCrash(TestEditLog.java:1233)
  at 
org.apache.hadoop.hdfs.server.namenode.TestEditLog.testFuzzSequences(TestEditLog.java:1272)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)  
at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  at java.lang.reflect.Method.invoke(Method.java:597)  at 
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
  at 
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
  at 
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
  at 
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
  at 
org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
  at 
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
  at 
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
  at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)  at 
org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)  at 
org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)  at 
org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)  at 
org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)  at 
org.junit.runners.ParentRunner.run(ParentRunner.java:236)  at 
org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)
  at 
org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)
  at 
org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112) 
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)  
at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  at java.lang.reflect.Method.invoke(Method.java:597)  at 
org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
  at 
org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
  at 
org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
  at 
org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
  at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75) 
Caused by: java.io.IOException: Invalid UTF8 at 9871b370d70a  at 
org.apache.hadoop.io.UTF8.readChars(UTF8.java:277)  at 
org.apache.hadoop.io.UTF8.toString(UTF8.java:151)  ... 39 more 
{code}

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