I can reproduce it fairly reliably with my test case; I average somewhere around a 50% chance of generating one or more of these files per test. My preliminary testing with db 4.8.30 is encouraging. I will update this thread with any conclusions.
Bart. On Tue, Oct 19, 2010 at 3:41 PM, Phil Carns <[email protected]> wrote: > > 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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