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https://issues.apache.org/jira/browse/HADOOP-8230?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13265151#comment-13265151
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Suresh Srinivas commented on HADOOP-8230:
-----------------------------------------

Eli, sorry for the late comment. I agree with the general direction of 
splitting hflush/hsync feature from append. Perhaps these features should be 
using two different flags.  

I have concerns with this change:
# I thought the proposal from HDFS-3120 was to add "dfs.support.sync". I do not 
see that flag in this patch.
# There are installations where hsync/hflush is disabled, using 
dfs.support.append. That option should be preserved.
# "dfs.support.broken.append" - why add this and not delete the tests that are 
testing append functionality?
                
> 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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