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https://issues.apache.org/jira/browse/HADOOP-16786?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran resolved HADOOP-16786.
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Resolution: Won't Fix
> Checksum FS #hsync does not sync to disk
> ----------------------------------------
>
> Key: HADOOP-16786
> URL: https://issues.apache.org/jira/browse/HADOOP-16786
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Mathias Herberts
> Priority: Major
>
> Recently I created a SequenceFile Writer and was surprised to see that the
> file size was not changing despite hsync being called after each append.
> After some fiddling around, I noticed that if write checksums are disabled
> then the hsync is effective.
> I checked the documentation and could not find any mention of the fact that
> hsync could be ineffective when write checksums are on.
> The Writer was using the LocalFilesystem.
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