Rushabh S Shah created HDFS-10878:
-------------------------------------

             Summary: TestDFSClientRetries#testIdempotentAllocateBlockAndClose 
throwing ConcurrentModificationException
                 Key: HDFS-10878
                 URL: https://issues.apache.org/jira/browse/HDFS-10878
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs-client
    Affects Versions: 2.7.3
            Reporter: Rushabh S Shah
            Assignee: Rushabh S Shah


This failed in out internal build
{noformat}
java.util.ConcurrentModificationException: null
        at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
        at java.util.ArrayList$Itr.next(ArrayList.java:851)
        at 
org.apache.hadoop.hdfs.server.blockmanagement.BlockInfoContiguousUnderConstruction.appendUCParts(BlockInfoContiguousUnderConstruction.java:396)
        at 
org.apache.hadoop.hdfs.server.blockmanagement.BlockInfoContiguousUnderConstruction.appendStringTo(BlockInfoContiguousUnderConstruction.java:382)
        at 
org.apache.hadoop.hdfs.server.blockmanagement.BlockInfoContiguousUnderConstruction.toString(BlockInfoContiguousUnderConstruction.java:375)
        at java.lang.String.valueOf(String.java:2982)
        at java.lang.StringBuilder.append(StringBuilder.java:131)
        at 
org.apache.hadoop.hdfs.protocol.ExtendedBlock.toString(ExtendedBlock.java:121)
        at com.google.common.base.Joiner.toString(Joiner.java:533)
        at com.google.common.base.Joiner.appendTo(Joiner.java:124)
        at com.google.common.base.Joiner.appendTo(Joiner.java:181)
        at com.google.common.base.Joiner.join(Joiner.java:237)
        at com.google.common.base.Joiner.join(Joiner.java:226)
        at com.google.common.base.Joiner.join(Joiner.java:245)
        at 
org.apache.hadoop.hdfs.TestDFSClientRetries$3.answer(TestDFSClientRetries.java:485)
        at 
org.apache.hadoop.hdfs.TestDFSClientRetries$3.answer(TestDFSClientRetries.java:477)
        at 
org.mockito.internal.stubbing.StubbedInvocationMatcher.answer(StubbedInvocationMatcher.java:31)
        at org.mockito.internal.MockHandler.handle(MockHandler.java:97)
        at 
org.mockito.internal.creation.MethodInterceptorFilter.intercept(MethodInterceptorFilter.java:47)
        at 
org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer$$EnhancerByMockitoWithCGLIB$$cca97ed1.complete(<generated>)
        at 
org.apache.hadoop.hdfs.DFSOutputStream.completeFile(DFSOutputStream.java:2303)
        at 
org.apache.hadoop.hdfs.DFSOutputStream.closeImpl(DFSOutputStream.java:2279)
        at 
org.apache.hadoop.hdfs.DFSOutputStream.close(DFSOutputStream.java:2243)
        at 
org.apache.hadoop.hdfs.TestDFSClientRetries.testIdempotentAllocateBlockAndClose(TestDFSClientRetries.java:507)
{noformat}

Its getting NPE in following Log message
{code:title=TestDFSClientRetries.java|borderStyle=solid}
 @Test
  public void testIdempotentAllocateBlockAndClose() throws Exception {
            ...
            public Boolean answer(InvocationOnMock invocation) throws Throwable 
{
          // complete() may return false a few times before it returns
          // true. We want to wait until it returns true, and then
          // make it retry one more time after that.
          LOG.info("Called complete(: " +
              Joiner.on(",").join(invocation.getArguments()) + ")");
           ...
}
{code}



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