Todd Lipcon created KUDU-2713:
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Summary: 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
Affects Versions: 1.4.0
Reporter: Todd Lipcon
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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