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https://issues.apache.org/jira/browse/HADOOP-3146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12584022#action_12584022
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dhruba borthakur commented on HADOOP-3146:
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I agree that even if the flush call in 0.17 is much more heavyweight that
earlier, I still do not understand why it is causing the task to hang. I wonder
if there is a bug in the implementation of DFSOutputStream.flush() that is
causing the observed problems!
> DFS flush should be light weighted
> ----------------------------------
>
> Key: HADOOP-3146
> URL: https://issues.apache.org/jira/browse/HADOOP-3146
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Reporter: Runping Qi
> Assignee: dhruba borthakur
> Priority: Blocker
> Fix For: 0.17.0
>
>
> Starting fron hadoop-0.17, calling flush of dfs becomes very expensive.
> The current implementation of flush should be renamed as sync.
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