[Freeswitch-users] Is MySQL OK to use?

[Steven Ayre]

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)
>>>
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>>
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>
>
> --
> Anthony Minessale II
>
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