[Gluster-users] "file changed as we read it" in gluster 3.7.4

[hmlth at t-hamel.fr]

On 2015-09-22 02:59, Krutika Dhananjay wrote:
> -------------------------
> 
>> FROM: hmlth at t-hamel.fr
>> Thank you, this solved the issue (after a umount/mount). The
>> question
>> now is: what's the catch? Why is this not the default?
>> 
>> https://partner-bugzilla.redhat.com/show_bug.cgi?id=1203122
>> 
>> The above link makes me think that there is a problem with
>> "readdirp"
>> performances but I'm not sure if the impact is serious or not.
> 
> That's right. Enabling the option can slow down readdirp operations,
> which is why it is disabled by default.

Is there a list of options where this tradeoff is being made? Disabling 
consistency for performance is not what I was expecting by default.

Regards

Thomas HAMEL




>> 
>> On 2015-09-21 16:14, Krutika Dhananjay wrote:
>>> Could you set 'cluster.consistent-metadata' to 'on' and try the
>> test
>>> again?
>>> 
>>> #gluster volume set <VOL> cluster.consistent-metadata on
>>> 
>>> -Krutika
>>> 
>>> -------------------------
>>> 
>>>> FROM: hmlth at t-hamel.fr
>>>> TO: gluster-users at gluster.org
>>>> SENT: Monday, September 21, 2015 7:10:59 PM
>>>> SUBJECT: [Gluster-users] "file changed as we read it" in gluster
>>>> 3.7.4
>>>> 
>>>> Hello,
>>>> 
>>>> I'm evaluating gluster on Debian, I installed the version 3.7.4
>> and
>>>> I
>>>> see this kind of error messages when I run tar:
>>>> 
>>>> # tar c linux-3.16.7-ckt11/ > /dev/null
>>>> tar: linux-3.16.7-ckt11/sound/soc: file changed as we read it
>>>> tar: linux-3.16.7-ckt11/net: file changed as we read it
>>>> tar: linux-3.16.7-ckt11/Documentation/devicetree/bindings: file
>>>> changed
>>>> as we read it
>>>> tar: linux-3.16.7-ckt11/Documentation: file changed as we read it
>>>> tar: linux-3.16.7-ckt11/tools/perf: file changed as we read it
>>>> tar: linux-3.16.7-ckt11/include/uapi/linux: file changed as we
>> read
>>>> it
>>>> tar: linux-3.16.7-ckt11/arch/powerpc: file changed as we read it
>>>> tar: linux-3.16.7-ckt11/arch/blackfin: file changed as we read it
>>>> tar: linux-3.16.7-ckt11/arch/arm/boot/dts: file changed as we
>> read
>>>> it
>>>> tar: linux-3.16.7-ckt11/arch/arm: file changed as we read it
>>>> tar: linux-3.16.7-ckt11/drivers/media: file changed as we read it
>>>> tar: linux-3.16.7-ckt11/drivers/staging: file changed as we read
>> it
>>>> #
>>>> 
>>>> I saw this problem was discussed here earlier but I was under the
>>>> impression it was resolved on the 3.5 series. Is the fix in the
>> 3.7
>>>> branch?
>>>> 
>>>> My volume configuration:
>>>> 
>>>> # gluster volume info glustervol1
>>>> 
>>>> Volume Name: glustervol1
>>>> Type: Replicate
>>>> Volume ID: 71ce34f2-28da-4674-91c9-b19a2b791aef
>>>> Status: Started
>>>> Number of Bricks: 1 x 3 = 3
>>>> Transport-type: tcp
>>>> Bricks:
>>>> Brick1: n1:/glusterfs/n1-2/brick
>>>> Brick2: n2:/glusterfs/n2-2/brick
>>>> Brick3: n3:/glusterfs/n3-2/brick
>>>> Options Reconfigured:
>>>> performance.readdir-ahead: on
>>>> cluster.server-quorum-ratio: 51
>>>> 
>>>> Regards
>>>> 
>>>> Thomas HAMEL
>>>> _______________________________________________
>>>> Gluster-users mailing list
>>>> Gluster-users at gluster.org
>>>> http://www.gluster.org/mailman/listinfo/gluster-users