[jira] [Updated] (HDFS-12112) TestBlockManager#testBlockManagerMachinesArray sometimes fails with NPE

["Wei-Chiu Chuang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-12112?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wei-Chiu Chuang updated HDFS-12112:
-----------------------------------
    Attachment: HDFS-12112.001.patch

Upload patch rev 001. Added a simple {{DFSTestUtil#waitForReplication()}} call to wait for replication.

> 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
>         Attachments: HDFS-12112.001.patch
>
>
> 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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