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https://issues.apache.org/jira/browse/HDFS-11362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15959749#comment-15959749
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Xiaoyu Yao commented on HDFS-11362:
-----------------------------------

Thanks [~hanishakoneru] for the update. +1 for the v001 patch. I will commit it 
shortly.

We should refactor StorageDirectory with a Builder pattern to avoid so many 
different constructors. This can be handled in a separate JIRA.

> Storage#shouldReturnNextDir should check for null dirType
> ---------------------------------------------------------
>
>                 Key: HDFS-11362
>                 URL: https://issues.apache.org/jira/browse/HDFS-11362
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs
>            Reporter: Hanisha Koneru
>            Assignee: Hanisha Koneru
>            Priority: Minor
>         Attachments: HDFS-11362.000.patch, HDFS-11362.001.patch
>
>
> _Storage#shouldReturnNextDir_ method checks if the next Storage directory is 
> of the same type us dirType.
> {noformat}
>     private boolean shouldReturnNextDir() {
>       StorageDirectory sd = getStorageDir(nextIndex);
>       return (dirType == null || sd.getStorageDirType().isOfType(dirType)) &&
>           (includeShared || !sd.isShared());
>     }
> {noformat}
> There is a possibility that sd.getStorageDirType() returns null (default 
> dirType is null). Hence, before checking for type match, we should make sure 
> that the value returned by sd.getStorageDirType() is not null.



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