postgres-xc-developers Mailing List for Postgres-XC

Hi,

Unfortunatelly, I haven't heard any progress on SAVEPOINT.
The feature is on the wish list, but AFAIC it seems not to have high priority.
 * https://sourceforge.net/p/postgres-xc/xc-wiki/Roadmap/

This page mentions about isolation levels.
 * http://postgres-xc.sourceforge.net/docs/1_2_1/sql-start-transaction.html
It says XC supports READ COMMITTED and READ UNCOMMITTED.

Regards.

On 21 August 2014 23:48, Mikko Rantalainen <mik...@pe...> wrote:
> Hi,
>
> Our software is using PostgreSQL as backend and we're considering
> different choices for high availability. I found Postgres-XC and noticed
> that SAVEPOINTs are not supported yet. Other than that, it seems to be a
> good match for our needs.
>
> Previous discussion about this issue seems to have happened around a
> year ago (http://sourceforge.net/p/postgres-xc/mailman/message/31349199/).
>
> What's the current status? Will SAVEPOINTs be supported in near future
> (e.g. within a year)?
>
> Also related question is where's the documentation about actually
> supported transaction isolation levels?
>
> --
> B.R.
> Mikko Rantalainen
>
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Hi,

Our software is using PostgreSQL as backend and we're considering 
different choices for high availability. I found Postgres-XC and noticed 
that SAVEPOINTs are not supported yet. Other than that, it seems to be a 
good match for our needs.

Previous discussion about this issue seems to have happened around a 
year ago (http://sourceforge.net/p/postgres-xc/mailman/message/31349199/).

What's the current status? Will SAVEPOINTs be supported in near future 
(e.g. within a year)?

Also related question is where's the documentation about actually 
supported transaction isolation levels?

-- 
B.R.
Mikko Rantalainen

Hello;

I removed PG packers ML from CC: list as advised.

BTW, replication by Trove must be for redundancy, which is different from XC’s replication.   I think you can still use Trove’s replication even for XC.   We may have to study Trove’s replication a bit to see if it supports multi-master configuration of XC coordinators.

Regards;
---
Koichi Suzuki

2014/08/20 15:11、Mark Kirkwood <mar...@ca...> のメール：

> On 19/08/14 23:14, Vivek Singh Raghuwanshi wrote:
>> 
>> Hi All,
>> 
>> Please let me know is that possible to use Openstack Trove with Postgres-XC.
>> With instances and Baremetal (after Juno Release).
>> I Know it is possible to use other medium like MySQL or PostgreSQL, but
>> i am not sure about XC.
> 
> AFAIK [1], vanilla Postgres support for Trove is still at the review 
> stage, and there is quite a bit to finish, and some stuff to fix.
> 
> I'd think that getting Trove to provision a complete XC VM (or more 
> sensibly a set of VMs that run XC) is going to require fair bit of extra 
> work.
> 
> It looks like replication will be deployable via Trove for the supported 
> flavours (Mysql, Mongo, Cassandra, Counch, Redis) see 
> https://wiki.openstack.org/wiki/Trove/Replication-And-Clustering . I'm 
> not seeing any specific discussion of sharding notice.
> 
> Cheers
> 
> Mark
> 
> [1] I've been helping debug the Postgres Trove patch
> 
> 
> ------------------------------------------------------------------------------
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> 

On 19/08/14 23:14, Vivek Singh Raghuwanshi wrote:
>
> Hi All,
>
> Please let me know is that possible to use Openstack Trove with Postgres-XC.
> With instances and Baremetal (after Juno Release).
> I Know it is possible to use other medium like MySQL or PostgreSQL, but
> i am not sure about XC.

AFAIK [1], vanilla Postgres support for Trove is still at the review 
stage, and there is quite a bit to finish, and some stuff to fix.

I'd think that getting Trove to provision a complete XC VM (or more 
sensibly a set of VMs that run XC) is going to require fair bit of extra 
work.

It looks like replication will be deployable via Trove for the supported 
flavours (Mysql, Mongo, Cassandra, Counch, Redis) see 
https://wiki.openstack.org/wiki/Trove/Replication-And-Clustering . I'm 
not seeing any specific discussion of sharding notice.

Cheers

Mark

[1] I've been helping debug the Postgres Trove patch

On 08/19/2014 04:14 AM, Vivek Singh Raghuwanshi wrote:
> 
> Hi All,
> 
> Please let me know is that possible to use Openstack Trove with Postgres-XC.
> With instances and Baremetal (after Juno Release).
> I Know it is possible to use other medium like MySQL or PostgreSQL, but
> i am not sure about XC.

Please do not cross-post this to pgsql-hackers, thanks.

-- 
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com

On 08/19/2014 07:46 PM, Vivek Singh Raghuwanshi wrote:
> Thanks,
> One more question, is this library support multitenancy or we need to
> launch separate VPC (virtual public cloud) every time for each customer.
> its good if we have both option.

Please don't cross-post this to pgsql-hackers; remove that CC from
future replies.

-- 
 Craig Ringer                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services

Thanks,
One more question, is this library support multitenancy or we need to
launch separate VPC (virtual public cloud) every time for each customer.
its good if we have both option.



On Tue, Aug 19, 2014 at 5:04 PM, 鈴木 幸市 <ko...@in...> wrote:

>  XC’s libpq is binary compatible with PG.   So as long as Openstack uses
> libpq to connect to PG, XC should work too.
>
>  Appreciate if you have a chance to try.
>
>  Thanks.
> ---
> Koichi Suzuki
>
>  2014/08/19 20:14、Vivek Singh Raghuwanshi <viv...@gm...>
> のメール：
>
>
>  Hi All,
>
>  Please let me know is that possible to use Openstack Trove with
> Postgres-XC.
>  With instances and Baremetal (after Juno Release).
>  I Know it is possible to use other medium like MySQL or PostgreSQL, but
> i am not sure about XC.
>
>
>  --
> ViVek Raghuwanshi
> Mobile -+91-09595950504
> Skype - vivek_raghuwanshi
> IRC vivekraghuwanshi
> http://vivekraghuwanshi.wordpress.com/
> http://in.linkedin.com/in/vivekraghuwanshi
>
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>
>
>


-- 
ViVek Raghuwanshi
Mobile -+91-09595950504
Skype - vivek_raghuwanshi
IRC vivekraghuwanshi
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http://in.linkedin.com/in/vivekraghuwanshi

XC’s libpq is binary compatible with PG.   So as long as Openstack uses libpq to connect to PG, XC should work too.

Appreciate if you have a chance to try.

Thanks.
---
Koichi Suzuki

2014/08/19 20:14、Vivek Singh Raghuwanshi <viv...@gm...<mailto:viv...@gm...>> のメール：


Hi All,

Please let me know is that possible to use Openstack Trove with Postgres-XC.
With instances and Baremetal (after Juno Release).
I Know it is possible to use other medium like MySQL or PostgreSQL, but i am not sure about XC.


--
ViVek Raghuwanshi
Mobile -+91-09595950504
Skype - vivek_raghuwanshi
IRC vivekraghuwanshi
http://vivekraghuwanshi.wordpress.com/
http://in.linkedin.com/in/vivekraghuwanshi
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Hi All,

Please let me know is that possible to use Openstack Trove with Postgres-XC.
With instances and Baremetal (after Juno Release).
I Know it is possible to use other medium like MySQL or PostgreSQL, but i
am not sure about XC.


-- 
ViVek Raghuwanshi
Mobile -+91-09595950504
Skype - vivek_raghuwanshi
IRC vivekraghuwanshi
http://vivekraghuwanshi.wordpress.com/
http://in.linkedin.com/in/vivekraghuwanshi

I'm sorry. I was wrong.

list_append_unique is also replaced to list_append_unique_ptr in your patch.
It looks fine.

Regards.

On 5 August 2014 16:15, Masataka Saito <pg...@gm...> wrote:
> Hi,
>
> I think this patch is good, but there is still some bad API calls,
> e.g. list_append_unique.
>
> Regards.
>
> On 31 July 2014 10:29, Wang Diancheng <dia...@gm...> wrote:
>> Hi,
>>
>> because struct pgxc_node_handle is not a kind of Node, we could not use
>> function list_member, list_delete.
>>
>> Patch attached.
>>
>>
>> ------------------------------------------------------------------------------
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>>

Hi,

I think this patch is good, but there is still some bad API calls,
e.g. list_append_unique.

Regards.

On 31 July 2014 10:29, Wang Diancheng <dia...@gm...> wrote:
> Hi,
>
> because struct pgxc_node_handle is not a kind of Node, we could not use
> function list_member, list_delete.
>
> Patch attached.
>
>
> ------------------------------------------------------------------------------
> Infragistics Professional
> Build stunning WinForms apps today!
> Reboot your WinForms applications with our WinForms controls.
> Build a bridge from your legacy apps to the future.
> http://pubads.g.doubleclick.net/gampad/clk?id=153845071&iu=/4140/ostg.clktrk
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>