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From "Wei-Chiu Chuang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-12112) TestBlockManager#testBlockManagerMachinesArray sometimes fails with NPE
Date Mon, 10 Jul 2017 19:26:02 GMT
Wei-Chiu Chuang created HDFS-12112:
--------------------------------------

             Summary: TestBlockManager#testBlockManagerMachinesArray sometimes fails with
NPE
                 Key: HDFS-12112
                 URL: https://issues.apache.org/jira/browse/HDFS-12112
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 3.0.0-beta1
         Environment: CDH5.12.0
            Reporter: Wei-Chiu Chuang
            Assignee: Wei-Chiu Chuang
            Priority: Minor


Found the following error:
{quote}
java.lang.NullPointerException: null
	at org.apache.hadoop.hdfs.server.blockmanagement.TestBlockManager.testBlockManagerMachinesArray(TestBlockManager.java:1202)
{quote}
The NPE suggests corruptStorageDataNode in the following code snippet could be null.
{code}
for(int i=0; i<corruptStorageDataNode.getStorageInfos().length; i++) {
{code}

Looking at the code, the test does not wait for file replication to happen, which is why corruptStorageDataNode
(the DN of the second replica) is null.



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