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https://issues.apache.org/jira/browse/KUDU-2713?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated KUDU-2713:
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Affects Version/s: (was: 1.4.0)
> FS misinterprets file block size as file system block size
> ----------------------------------------------------------
>
> Key: KUDU-2713
> URL: https://issues.apache.org/jira/browse/KUDU-2713
> Project: Kudu
> Issue Type: Bug
> Components: fs
> Reporter: Todd Lipcon
> Priority: Critical
>
> We recently saw a case where a cluster was using XFS with the 'largeio' mount
> option. This caused files on the drive to report a 4MB block size, even
> though the actual file system block size was the default 4kb. This caused the
> LBM to align all blocks up to 4MB and cause an enormous amount of wasted
> space.
> Instead of using the file's block size we should probably use statvfs() which
> reports the correct block size. Alternatively we could consider actually
> running a basic hole-punch test to determine the granularity of hole punches.
> Fixing this in a compatible way may also be a bit involved since changing the
> apparent block size of a system after the instance has been formatted will
> prevent it from starting.
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