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Posted to common-issues@hadoop.apache.org by "Steve Loughran (Jira)" <ji...@apache.org> on 2020/01/03 14:55:00 UTC

[jira] [Resolved] (HADOOP-16786) Checksum FS #hsync does not sync to disk

     [ https://issues.apache.org/jira/browse/HADOOP-16786?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steve Loughran resolved HADOOP-16786.
-------------------------------------
    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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