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https://issues.apache.org/jira/browse/HDFS-3677?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13417639#comment-13417639
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Andy Isaacson commented on HDFS-3677:
-------------------------------------

Am I reading the code right that a given edits dir must be listed in *both* 
{{dfs.namenode.edits.dir}} and {{dfs.namenode.edits.dir.required}} for the 
latter to take effect, and if a directory is listed only in {{.required}} it 
will be silently ignored?

If so, that's a pretty bad admin experience.
                
> dfs.namenode.edits.dir.required missing from hdfs-default.xml
> -------------------------------------------------------------
>
>                 Key: HDFS-3677
>                 URL: https://issues.apache.org/jira/browse/HDFS-3677
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 2.0.0-alpha
>            Reporter: Todd Lipcon
>              Labels: newbie
>
> This config should be documented. It's useful for cases where the user would 
> like to ensure that (eg) an NFS filer always has the most up-to-date edits.

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