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https://issues.apache.org/jira/browse/HDFS-2188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13103743#comment-13103743
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Ivan Kelly commented on HDFS-2188:
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The attach patch simply makes edit log take the storage list as URIs rather 
than from Storage. HDFS-1580 will make it possible to load other Journal types.

> HDFS-1580: Make FSEditLog create its journals from a list of URIs rather than 
> NNStorage
> ---------------------------------------------------------------------------------------
>
>                 Key: HDFS-2188
>                 URL: https://issues.apache.org/jira/browse/HDFS-2188
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Ivan Kelly
>            Assignee: Ivan Kelly
>             Fix For: 0.23.0
>
>         Attachments: HDFS-2188.diff, HDFS-2188.diff
>
>
> Currently, FSEditLog retrieves the list of Journals to create from NNStorage. 
> Obviously this is file specific. This JIRA aims to remove this restriction to 
> make it possible to create journals of custom types.

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