[CRIU] Re, Issues dumping MySQL process

[Pavel Emelyanov]

On 03/19/2015 05:21 PM, Hui Kang wrote:
> Hi, Deyan,
> I am using CRIU 1.5. I switch to the mysql version (5.5) you used and finally it went through.

In criu-1.5 we implemented support for AIO rings that were used by MySQL. 
This can be the reason for successful C/R of MySQL with recent CRIU :)

> I think the problem may cased by something in mysql 5.6. Do you have any experience. Thanks.
> 
> - Hui
> 
> On Thu, Mar 19, 2015 at 3:31 AM, Deyan Doychev <deyan at 1h.com <mailto:deyan at 1h.com>> wrote:
> 
>     Hi,
> 
>     Unfortunately, I have not encountered such a problem with Percona. After
>     the AIO config change I am able to dump Percona server without any hangs.
> 
>     Maybe you could try asking on the the CRIU mail list (criu at openvz.org <mailto:criu at openvz.org>)
>     as I am currently using an outdated CRIU version and may misguide you.
>     People there are really nice and always happy to help.
> 
>     Regards,
>     Deyan
> 
>     On 03/18/2015 05:06 PM, Hui Kang wrote:
>     > Hi,
>     > I am using CRIU to dump a percona mysql process. First I add
>     > [mysqld]
>     > innodb_use_native_aio = false
>     > to resolve of the issue of non-regular mapping. However, the dump
>     > process hangs on
>     >
>     > (00.819732) Pagemap generated: 18 pages 0 holes
>     > (00.819741) Pagemap generated: 2 pages 0 holes
>     > (00.833712) ----------------------------------------
>     > (00.836236)
>     > (00.836274) Dumping core (pid: 11855)
>     > (00.836283) ----------------------------------------
>     > (00.836291) Obtaining personality ... (00.836430) 11855 has 0 sched policy
>     > (00.836448)     dumping 0 nice for 11855
>     > (00.836461) cg: Dumping cgroups for 11855
>     > (00.836977) ----------------------------------------
>     > (00.836996)
>     > (00.837003) Dumping creds for 11855)
>     > (00.837010) ----------------------------------------
>     >
>     > PID 11855 is the mysqld process. Could anyone can help?
>     > Thanks.
>     >
>     > - Hui
>     >
> 
> 
> 
> 
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