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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8230) Enable sync by default and disable append
Date Sun, 06 May 2012 23:46:51 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8230?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13269311#comment-13269311
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Todd Lipcon commented on HADOOP-8230:
-------------------------------------

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

Then several us spent many months fixing those bugs, and we haven't seen any since.

{quote}
Given that the default in Hadoop 1 is off, why not leave it off and give a way to turn it
on.
The current default is off and I don't see a reason to change that default in 1.1.
There are installations have that are using the current default.
Can you please explain the reason the make this change?
{quote}

It's a pain for HBase users to have to manually flip this, and risk data loss if they don't.
Changing the default also means we have fewer code paths to maintain for the average user.
                
> 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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