On Sep 5, 2007, at 10:47 AM, Rob Ross wrote:
Are those cookies not somehow tied to a particular client?
No they're not.
-sam
Sam Lang wrote:
On Sep 5, 2007, at 10:31 AM, Phil Carns wrote:
We have run into a problem with running "rm -rf" and "ls"
concurrently on the same directory from different client nodes.
In the particular case that we are looking at, the directory has
about 7000 files in it but no subdirectories. If we do an ls on
the directory while an "rm -rf" is running from a different
client, then the rm fails to remove all of the files. It seems
to get worse if you do more than one ls while the rm is working.
This is on RHEL4 with 2.6.9.something kernels.
Has anyone else seen this? Any idea what the problem is?
Hi Phil,
The trove layer caches the position -> name mapping for positions
it returns back to the client on a readdir. The problem is
probably related to caching those entries, where the readdir for
the rm is iterating over the directory, and so inserting position -
> name entries into the cache, and then ls is coming along and
replacing those entries with its own, where the position is the
same but the name is further down in the directory (because rm has
removed some of them). That's just a guess though. You could see
if disabling that position cache helps fix the problem, disabling
it will cause the berkeley db iterate to walk through all the
entries up to the position though, so its going to be much
slower. The position cache is in dbpf-keyval-pcache.c.
Probably the right long term solution is to return the name as the
position, instead of an int.
-sam
thanks,
-Phil
_______________________________________________
Pvfs2-developers mailing list
[email protected]
http://www.beowulf-underground.org/mailman/listinfo/pvfs2-developers
_______________________________________________
Pvfs2-developers mailing list
[email protected]
http://www.beowulf-underground.org/mailman/listinfo/pvfs2-developers
_______________________________________________
Pvfs2-developers mailing list
[email protected]
http://www.beowulf-underground.org/mailman/listinfo/pvfs2-developers
