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https://issues.apache.org/jira/browse/HADOOP-8230?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13269690#comment-13269690
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stack commented on HADOOP-8230:
-------------------------------

bq. This was turned on in the 20 originally and then we had to turn it off due 
bugs.

The "bugs" were fixed a good while ago.

bq. Can you please explain the reason the make this change?

+ HBase needs it.
+ Its broken that users have to flip a configuration flag, then stop+start, to 
make a basic fs api method work.
                
> Enable sync by default and disable append
> -----------------------------------------
>
>                 Key: HADOOP-8230
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8230
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 1.0.0
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>             Fix For: 1.1.0
>
>         Attachments: hadoop-8230.txt
>
>
> Per HDFS-3120 for 1.x let's:
> - Always enable the sync path, which is currently only enabled if 
> dfs.support.append is set
> - Remove the dfs.support.append configuration option. We'll keep the code 
> paths though in case we ever fix append on branch-1, in which case we can add 
> the config option back

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