[Gluster-users] Client hang on find of directories

[Joe Landman]

On 04/24/2011 03:03 PM, Burnash, James wrote:
> Gluster 3.1.1
>
> CentOS 5.5 (servers), CentOS 5.2 (client).
>
> /pfs2 is the mount point for a Duplicated-Replicate volume of 4 servers.
>
> Given this command line executed on the client:
>
> root at jc1lnxsamm46:/root # time find /pfs2/online_archive/2010 -type d –print
>
> and this output:
>

[...]

> Client was originally deployed as GlusterFS 3.0.4, that was uninstalled,
> version 3.1.1 was installed, and then later upgraded to 3.1.3.
>
> Any ideas on what is going on here?

possibly multiple things.  Looks like a slow stat issue, compounded by a 
run-time link issue.  You might need to locate where you installed your 
glusterfs installation, and make sure it is included in a file in 
/etc/ld.so.conf.d/gluster.conf

	/usr/local/lib
	/usr/local/lib64

then run

	ldconfig -v

and then restart gluster.

As to the slow aspect, large directories with many stats will take a 
very long time.  At this point in time, we are turning off stat-prefetch 
and a number of other things by default due to breakage, for 
deployments.  This will negatively impact stat performance (requiring at 
least one round trip per stat), and show up as huge time delays in large 
directories.

It might help to turn up debugging on the servers, and pastebin the logs.

>
> Thanks,
>
> James Burnash
>
> Unix Engineering
>
>
>
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-- 
Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics, Inc.
email: landman at scalableinformatics.com
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