[Freeswitch-users] Is MySQL OK to use?

[Steven Ayre]

It's within the MyODBC driver and not within the libmysqlclient library
which means the driver is not thread-safe even if you're using
libmysqlclient_r. Incidentally in recent versions libmysqlclient is
thread-safe and libmysqlclient_r is just a symlink to libmysqlclient.

On 6 April 2016 at 17:20, Michael Jerris <mike at jerris.com> wrote:

> This sounds like a bug in the mysql driver then right?  If those are not
> threadsafe then the driver should protect against use where it is not safe.
>
> On Apr 6, 2016, at 5:44 AM, Steven Ayre <steveayre at gmail.com> wrote:
>
> I've been doing some debugging on this this week as we're currently seeing
> regular crashes on our production servers. This happens with both
> Threading=0 and Threading=2.
>
> It appears it's a bug in MyODBC triggered because FreeSWITCH uses a new
> ODBC environment handle every time it creates a connection.
>
> When a environment handle is created myodbc_init is called and when it's
> freed it calls myodbc_end. Those functions are not thread-safe. They're
> protected by a reference counter but they aren't wrapped in a mutex so if
> the server is busy and they're both called at the same time you can result
> in some global variables being used after they're freed.
>
> Rebuilding MyODBC with an empty myodbc_end appears to stop the crashes,
> but I'm not saying that's a good solution. Still looking at it.
>
> On 22 November 2013 at 20:31, Anthony Minessale <
> anthony.minessale at gmail.com> wrote:
>
>> I've always seen Threading=0 as the solution to stability probs.
>> Basically if the driver already uses mutexing, its better to disable the
>> arbitrary ones in the core of odbc.
>> For postgres 0 is basically mandatory.
>>
>>
>>
>> On Fri, Nov 22, 2013 at 2:12 AM, Steven Ayre <steveayre at gmail.com> wrote:
>>
>>> No such thing in the latest versions, they're all threadsafe now (_r is
>>> a symlink to the other).
>>>
>>> I use it with success. I did find stability problems in libmyodbc when
>>> upgrading from 5.0 to 5.5. My solution was to add these to odbc.ini
>>>
>>> Option      = 67108864
>>> Threading   = 2
>>>
>>> The Threading setting is what stopped the crashes. There's a Jira on the
>>> subject and someone else said manually upgrading to a newer version of
>>> unixodbc+myodbc also fixed it.
>>>
>>> -Steve
>>>
>>>
>>>
>>> On 21 November 2013 18:23, Jeff Leung <jleung at v10networks.ca> wrote:
>>>
>>>> Try the non-thread safe MySQL library instead of the thread safe one.
>>>>
>>>>
>>>>
>>>> *From:* freeswitch-users-bounces at lists.freeswitch.org [mailto:
>>>> freeswitch-users-bounces at lists.freeswitch.org] *On Behalf Of *Vik Killa
>>>> *Sent:* Thursday, November 21, 2013 10:22 AM
>>>> *To:* FreeSWITCH Users Help
>>>> *Subject:* Re: [Freeswitch-users] Is MySQL OK to use?
>>>>
>>>>
>>>>
>>>> short answer no.
>>>>
>>>> use postgres
>>>>
>>>>
>>>>
>>>> On Thu, Nov 21, 2013 at 12:41 PM, Alex Lake <alex at digitalmail.com>
>>>> wrote:
>>>>
>>>> I find these "Error in my_thread_global_end()" messages somewhat
>>>> annoying in my fs1.2stable on Ubuntu12.04 box. Is there any advice
>>>> (other than "don't use MySQL") for how to install it better? Might it be
>>>> something to do with thread-safe libraries (I'm using libmyodbc_r.so at
>>>> the moment)
>>>>
>>>>
>>>> _________________________________________________________________________
>>>> Professional FreeSWITCH Consulting Services:
>>>> consulting at freeswitch.org
>>>> http://www.freeswitchsolutions.com
>>>>
>>>> FreeSWITCH-powered IP PBX: The CudaTel Communication Server
>>>> http://www.cudatel.com
>>>>
>>>> Official FreeSWITCH Sites
>>>> http://www.freeswitch.org
>>>> http://wiki.freeswitch.org
>>>> http://www.cluecon.com
>>>>
>>>> FreeSWITCH-users mailing list
>>>> FreeSWITCH-users at lists.freeswitch.org
>>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>>>> UNSUBSCRIBE:
>>>> http://lists.freeswitch.org/mailman/options/freeswitch-users
>>>> http://www.freeswitch.org
>>>>
>>>>
>>>>
>>>>
>>>> _________________________________________________________________________
>>>> Professional FreeSWITCH Consulting Services:
>>>> consulting at freeswitch.org
>>>> http://www.freeswitchsolutions.com
>>>>
>>>> FreeSWITCH-powered IP PBX: The CudaTel Communication Server
>>>> http://www.cudatel.com
>>>>
>>>> Official FreeSWITCH Sites
>>>> http://www.freeswitch.org
>>>> http://wiki.freeswitch.org
>>>> http://www.cluecon.com
>>>>
>>>> FreeSWITCH-users mailing list
>>>> FreeSWITCH-users at lists.freeswitch.org
>>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>>>> UNSUBSCRIBE:
>>>> http://lists.freeswitch.org/mailman/options/freeswitch-users
>>>> http://www.freeswitch.org
>>>>
>>>>
>>>
>>> _________________________________________________________________________
>>> Professional FreeSWITCH Consulting Services:
>>> consulting at freeswitch.org
>>> http://www.freeswitchsolutions.com
>>>
>>> FreeSWITCH-powered IP PBX: The CudaTel Communication Server
>>> http://www.cudatel.com
>>>
>>> Official FreeSWITCH Sites
>>> http://www.freeswitch.org
>>> http://wiki.freeswitch.org
>>> http://www.cluecon.com
>>>
>>> FreeSWITCH-users mailing list
>>> FreeSWITCH-users at lists.freeswitch.org
>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>>> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
>>> http://www.freeswitch.org
>>>
>>>
>>
>>
>> --
>> Anthony Minessale II
>>
>> FreeSWITCH http://www.freeswitch.org/
>> ClueCon http://www.cluecon.com/
>> Twitter: http://twitter.com/FreeSWITCH_wire
>>
>> AIM: anthm
>> MSN:anthony_minessale at hotmail.com
>> GTALK/JABBER/PAYPAL:anthony.minessale at gmail.com
>> IRC: irc.freenode.net #freeswitch
>>
>> FreeSWITCH Developer Conference
>> sip:888 at conference.freeswitch.org
>> googletalk:conf+888 at conference.freeswitch.org
>> pstn:+19193869900
>>
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> http://www.freeswitchsolutions.com
>>
>> FreeSWITCH-powered IP PBX: The CudaTel Communication Server
>> http://www.cudatel.com
>>
>> Official FreeSWITCH Sites
>> http://www.freeswitch.org
>> http://wiki.freeswitch.org
>> http://www.cluecon.com
>>
>> FreeSWITCH-users mailing list
>> FreeSWITCH-users at lists.freeswitch.org
>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
>> http://www.freeswitch.org
>>
>>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://confluence.freeswitch.org
> http://www.cluecon.com
>
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> http://www.freeswitch.org
>
>
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://confluence.freeswitch.org
> http://www.cluecon.com
>
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> http://www.freeswitch.org
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.freeswitch.org/pipermail/freeswitch-users/attachments/20160406/cd7d1144/attachment-0001.html