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https://issues.apache.org/jira/browse/HADOOP-8230?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13267819#comment-13267819
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Suresh Srinivas commented on HADOOP-8230:
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bq. We've had sync on by default in hundreds of our customer clusters for
almost two years now and have yet to see a related data-loss event. The only
bugs we've seen have been bugs where sync() wouldn't provide the correct
semantics, but for installs which don't use sync, that doesn't matter.
That is great.
Still, I think we should retain ability to turn it off, because I want to
continue running my installation that way and this patch removes that ability.
> 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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