postgres-xc-general Mailing List for Postgres-XC

2013/1/18 Filip Rembiałkowski <fil...@gm...>:
> What do you exactly mean by saying that triggers are not supported?
>
> Is it that in the context of single datanode, they will still work,
> but the changes are not replicated over the whole XC cluster? Making
> the cluster inconsistent?

Not that simple.  Depending upon trigger functions, some of them
cannoot simply be invoked at datanode.   The updated rows may have to
be transfered to the coordinator for such trigger frunctions, if
trigger functions are volatile or stable.

Internally, we've tried several times to support triggers but we found
restrictions which are not simple to describe.   This time, we're
trying not to bring any retrictions, though some of them may need
further optimization.

>
> If the triggers are not supported, how come you passed all the
> postgres regression tests?

They're skipped in the regression.

Regards;
---
Koichi

>
> Thanks
>
>
>
>
>
>
> On Thu, Jan 17, 2013 at 12:12 AM, Ashutosh Bapat
> <ash...@en...> wrote:
>> On Thu, Jan 17, 2013 at 9:26 AM, Filip Rembiałkowski
>> <fil...@gm...> wrote:
>>> Huh, these are really interesting questions :-)
>>>
>>> Let me ask them instead as a proof that userbase is interested.
>>>
>>> 1) Is there support for triggers in Postres-XC? Are there any
>>> limitations? Known issues?
>>>
>>
>> Triggers will be supported in next release; we are working on that.
>>
>>> 2) Does it make sense to run datanodes over distant links (think WAN
>>> or intercontinental) ?
>>>
>>
>> No, at least not in next few versions. XC being a scalability
>> solution, WAN or intercontinental links do not help; they slow down
>> things. As of now, XC is susceptible to network failures/glitches.
>> Using WAN or intercontinental links might cause network failures or
>> glitches, which will cause XC to behave erratically. We haven't tested
>> XC in such environment, so can't describe exact problems it will face.
>>
>>> Thanks && Regards,
>>> Filip Rembiałkowski
>>>
>>>
>>> On Wed, Jan 16, 2013 at 9:15 PM, Michael Paquier <mi...@ot...> wrote:
>>>
>>>> In order to get answers to your questions, I highly recommend that you
>>>> send your messages to the Postgres-XC mailing lists, in your case
>>>> pos...@li....
>>>
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>>
>>
>> --
>> Best Wishes,
>> Ashutosh Bapat
>> EntepriseDB Corporation
>> The Enterprise Postgres Company
>
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