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https://issues.apache.org/jira/browse/HDFS-13505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16897715#comment-16897715
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Dinesh Chitlangia commented on HDFS-13505:
------------------------------------------

For customers who have disabled HDFS ACLs intentionally will not be happy with 
this being turned on by upgrades. Also, people with large FSImages have to go 
through additional pain of reverting back to old value after upgrade and then 
restart HDFS again. This adds to the post upgrade hassles.

> Turn on HDFS ACLs by default.
> -----------------------------
>
>                 Key: HDFS-13505
>                 URL: https://issues.apache.org/jira/browse/HDFS-13505
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Ajay Kumar
>            Assignee: Siyao Meng
>            Priority: Major
>         Attachments: HDFS-13505.00.patch, HDFS-13505.001.patch
>
>
> Turn on HDFS ACLs by default.



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