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https://issues.apache.org/jira/browse/HDFS-4158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13492026#comment-13492026
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Aaron T. Myers commented on HDFS-4158:
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Ah, so you did. It might be better to use INodeDirectory#getChildrenList
instead of INodeDirectory#getChildren and then do a null check. Very minor
issue though.
> FSDirectory#hasSnapshot will NPE when deleting an empty directory
> -----------------------------------------------------------------
>
> Key: HDFS-4158
> URL: https://issues.apache.org/jira/browse/HDFS-4158
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: name-node
> Affects Versions: Snapshot (HDFS-2802)
> Reporter: Aaron T. Myers
> Assignee: Aaron T. Myers
> Attachments: HDFS-4158.patch
>
>
> The method attempts to iterate over the child list of the directory, but that
> list may be null and this isn't handled currently.
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