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https://issues.apache.org/jira/browse/HDFS-6563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14036725#comment-14036725
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Aaron T. Myers commented on HDFS-6563:
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Thanks a lot for the quick review, Jing.

> NameNode cannot save fsimage in certain circumstances when snapshots are in 
> use
> -------------------------------------------------------------------------------
>
>                 Key: HDFS-6563
>                 URL: https://issues.apache.org/jira/browse/HDFS-6563
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode, snapshots
>    Affects Versions: 2.4.0
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>            Priority: Critical
>         Attachments: HDFS-6563.patch
>
>
> Checkpoints will start to fail and the NameNode will not be able to manually 
> saveNamespace if the following set of steps occurs:
> # A zero-length file appears in a snapshot
> # That file is later lengthened to include at least one block
> # That file is subsequently deleted from the present file system but remains 
> in the snapshot
> More details in the first comment.



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