Removing the metadata object for a file does indeed produce the same
symptoms we are seeing. It produces a similar effect on 2.8 as well. I
believe I was working with Sam and possibly you on this a few weeks
ago but had to drop it for something more urgent. Our conversation can
be found here:
http://www.beowulf-underground.org/pipermail/pvfs2-developers/2010-June/004605.html
In 2.8, pvfs2-rm does not currently remove the file entries. Sam had
the same ENOTENT fix for 2.8. After creating a file and removing the
metadata object, it allows the file entry to be removed.
Ah! Believe it or not I had forgotten about that thread, but Sam's fix
must have stuck in my head subconsciously because I figured out where to
add that check in 2.6 pretty quickly :)
We need to get this fix into cvs if it isn't there already...
I believe Jim Kusznir may have been experiencing similar issues when
he posted to the Users list here:
http://www.beowulf-underground.org/pipermail/pvfs2-users/2010-September/003186.html
It appears that something is still triggering this issue in 2.8. Based
on my own anecdotal evidence with 2.6 and 2.8, it looks like it can
happen when a file system is getting hammered with creates and/or
deletes. My test case to reproduce on 2.8 involved several threads
executing a script that creates, opens, writes, and then deletes a
file many thousands of times. The problems we have had on 2.6 also
correlate to heavy loads of file creations and deletions.
Anyone have thoughts on why some files are getting left without their
metadata object?
Bart.
I think Becky had some good ideas. How hard is this to reproduce? Can
you do it pretty reliably with your test case?
-Phil
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