postgres-xc-general Mailing List for Postgres-XC (Page 3)

On Mon, Oct 20, 2014 at 11:19 AM, 鈴木 幸市 <ko...@in...> wrote:

>  In HA, I don’t think Corosync/Pacemaker can deal with XC configuration,
> where many components are interrelated and they are HA-aware.    At
> present, Corosync/Pacemaker works well for HA-unaware components with
> master/slave pair model.   XC configuration is more complicated than what
> they can deal with.
>
>
We have configured with Corosync/Pacemaker. It is complex, however.



-- 
Mason Sharp

TransLattice - http://www.translattice.com
Clustered and Distributed Database Solutions

In HA, I don’t think Corosync/Pacemaker can deal with XC configuration, where many components are interrelated and they are HA-aware.    At present, Corosync/Pacemaker works well for HA-unaware components with master/slave pair model.   XC configuration is more complicated than what they can deal with.

Regards;
---
Koichi Suzuki

2014/10/20 18:05、Mason Sharp <ms...@tr...<mailto:ms...@tr...>> のメール：



On Sun, Oct 19, 2014 at 9:34 PM, Michael Paquier <mic...@gm...<mailto:mic...@gm...>> wrote:


On Sat, Oct 18, 2014 at 5:12 PM, Santiago Ibarbia <san...@gm...<mailto:san...@gm...>> wrote:
Hi, i'm studying informatics and we are doing an investigation of postgres-xc.
I searched information about that everyware and it isn't enough for making a presentation.
Can you give me a little more information or a document in where I could see more technical specifications??
You may find the Holy Grail here:
http://sourceforge.net/projects/postgres-xc/files/Presentation/

Just to provide a bit more background information to save some time for TL;DR cases-

Performance:

OLTP: coordinators add about 30% overhead. For linear scalability, we would expect 10 nodes to have about 7x performance compared to vanilla PostgreSQL. Instead it is 6 - 6.4 in DBT-1 tests, a TPC-W like benchmark.

OLAP: it depends on your schema, but if denormalized and quite simple, you can expect pretty much linear scalability. With a more complicated schema or queries, more nodes may perform worse than native PostgreSQL.

HA:

There is no automatic failover. You can set up standbys of key cluster components, and fail them over manually. An alternative is to write your own monitoring and failover, or use Corosync/Pacemaker. If acceptable in your environment, it may even be preferable to manually failover to prevent false positives and having to deal with failback.

I hope that helps.


--
Mason Sharp

TransLattice - http://www.translattice.com<http://www.translattice.com/>
Clustered and Distributed Database Solutions


------------------------------------------------------------------------------
Comprehensive Server Monitoring with Site24x7.
Monitor 10 servers for $9/Month.
Get alerted through email, SMS, voice calls or mobile push notifications.
Take corrective actions from your mobile device.
http://p.sf.net/sfu/Zoho_______________________________________________
Postgres-xc-general mailing list
Pos...@li...
https://lists.sourceforge.net/lists/listinfo/postgres-xc-general

On Sun, Oct 19, 2014 at 9:34 PM, Michael Paquier <mic...@gm...>
wrote:

>
>
> On Sat, Oct 18, 2014 at 5:12 PM, Santiago Ibarbia <
> san...@gm...> wrote:
>
>> Hi, i'm studying informatics and we are doing an investigation of
>> postgres-xc.
>> I searched information about that everyware and it isn't enough for
>> making a presentation.
>> Can you give me a little more information or a document in where I could
>> see more technical specifications??
>>
> You may find the Holy Grail here:
> http://sourceforge.net/projects/postgres-xc/files/Presentation/
>

Just to provide a bit more background information to save some time for
TL;DR cases-

Performance:

OLTP: coordinators add about 30% overhead. For linear scalability, we would
expect 10 nodes to have about 7x performance compared to vanilla
PostgreSQL. Instead it is 6 - 6.4 in DBT-1 tests, a TPC-W like benchmark.

OLAP: it depends on your schema, but if denormalized and quite simple, you
can expect pretty much linear scalability. With a more complicated schema
or queries, more nodes may perform worse than native PostgreSQL.

HA:

There is no automatic failover. You can set up standbys of key cluster
components, and fail them over manually. An alternative is to write your
own monitoring and failover, or use Corosync/Pacemaker. If acceptable in
your environment, it may even be preferable to manually failover to prevent
false positives and having to deal with failback.

I hope that helps.


-- 
Mason Sharp

TransLattice - http://www.translattice.com
Clustered and Distributed Database Solutions

I’m afraid you’re asking this question to XL, not XC.
---
Koichi Suzuki

2014/10/19 23:05、侯晓欢 <101...@qq...> のメール：

> How to enable dtrace  after installed postgresql-xl in .rpm 
> 
> First,I installed postgresql-xl  in .rpm not source code.Then I need to enable dtrace to trace dynamicly,How should I do?------------------------------------------------------------------------------
> Comprehensive Server Monitoring with Site24x7.
> Monitor 10 servers for $9/Month.
> Get alerted through email, SMS, voice calls or mobile push notifications.
> Take corrective actions from your mobile device.
> http://p.sf.net/sfu/Zoho_______________________________________________
> Postgres-xc-general mailing list
> Pos...@li...
> https://lists.sourceforge.net/lists/listinfo/postgres-xc-general

On Sat, Oct 18, 2014 at 5:12 PM, Santiago Ibarbia <
san...@gm...> wrote:

> Hi, i'm studying informatics and we are doing an investigation of
> postgres-xc.
> I searched information about that everyware and it isn't enough for making
> a presentation.
> Can you give me a little more information or a document in where I could
> see more technical specifications??
>
You may find the Holy Grail here:
http://sourceforge.net/projects/postgres-xc/files/Presentation/
-- 
Michael

On Sun, Oct 19, 2014 at 11:05 PM, 侯晓欢 <101...@qq...> wrote:

> How to enable dtrace  after installed postgresql-xl in .rpm ‍
>
> First,I installed postgresql-xl  in .rpm not source code.Then I need to
> enable dtrace to trace ‍dynamicly,How should I do?
>
There are no differences with Postgres itself, so here is a good reference:
http://www.postgresql.org/docs/devel/static/dynamic-trace.html
In short, the RPMs you got need to be compiled with --enable-dtrace set at
./configure. Not sure if those RPMs have it set though... Run this command
to be sure after installing the RPMs:
pg_config | grep CONFIGURE.
‍
Note that this is a mailing list for Postgres-XC, not Postgres-XL, even if
I don't mind much..
Regards,
-- 
Michael

Do you mean interaction between different XC clusters?   If so, it is
outside XC scope at present.    You may need FDW or blink, which are
not enabled in XC yet.

Regards;
---
Koichi Suzuki


2014-10-16 21:23 GMT+09:00 Gilberto Nunes <gil...@gm...>:
> I see...
> But, let's suppose  if I have XC Cluster on site "A", and that Cluster also
> connect with other site "B", which has it own Cluster.
>
> Then, when Site "A" goes off line,  I suppose that when connection back on
> line, there's some updates spread to cluster. Or am I wrong thinking like
> that?
> I'm just trying to understand...
>
> Thank you
>
> 2014-10-16 0:30 GMT-03:00 鈴木 幸市 <ko...@in...>:
>
>> Postgres-XC is based upon tightly coupled distributed database mode, which
>> means it generally assumes all the nodes are up and available.
>>
>> In reality, if failed node is not involved in a transaction, it will be
>> successful.   If you try to update a shard at failed node, or you try to
>> update replicated table which the failed node is involved, or if you try to
>> issue DDL which is supposed to propagate to all the nodes, such transaction
>> will fail.   It is quite hard for XC to allow only partial DDL propagation
>> because this will very easily make whole cluster inconsistent when the
>> failed node is up and back.
>>
>> Hope your application meets this behavior.
>>
>> Regards;
>> ---
>> Koichi Suzuki
>>
>> 2014/10/15 20:16、Gilberto Nunes <gil...@gm...> のメール：
>>
>> Let me explatin
>>
>> What I looking for is using Potsgre-XC on distribuited sites... Once this
>> site get off line for any reason, link Local Link failure or Cluster Link
>> failuer, local application can continue works and once the link get back on
>> line, the Postgres-XC sync the local difference with others nodes/databases
>> on the others site...
>>
>> I need to know if this will be nice, if I use normal adsl...
>>
>> Thanks
>>
>> 2014-10-15 7:52 GMT-03:00 Abbas Butt <abb...@en...>:
>>>
>>>
>>>
>>> On Wed, Oct 15, 2014 at 3:47 PM, Gilberto Nunes
>>> <gil...@gm...> wrote:
>>>>
>>>> Yep
>>>>
>>>> I'll work with 1.2 version... 1.0.4 was just for test purpose and to
>>>> understand the concept...
>>>> BTW, can work with ADSL as Internet Link, like 30 MBPS or dedicate link
>>>> is recommend?
>>>
>>>
>>> Do you mean the link between application and the cluster OR the link
>>> between the nodes of the cluster?
>>> If you mean the link between application and the cluster you should be
>>> OK.
>>>
>>>> I know there's some others specs that I need to take in mind, like
>>>> processors, memory, and so on...
>>>> But  my doubt is if I work with normal ADSL the DB will be work
>>>> properly...
>>>>
>>>> Thanks
>>>>
>>>> 2014-10-15 0:01 GMT-03:00 鈴木 幸市 <ko...@in...>:
>>>>
>>>>> Hell;
>>>>>
>>>>> Abbas, thanks for the quick response.
>>>>>
>>>>> To start with, pgxc_ctl primer will be a good starting point.
>>>>> Pgxc_ctl is postgres-xc cluster configuration/operation utility.
>>>>>
>>>>> Tutorial is available at
>>>>> https://sourceforge.net/projects/postgres-xc/files/Pgxc_ctl_primer/
>>>>>
>>>>> I’m afraid 1.0.x is a bit old.   Why don’t you start with 1.1 or 1.2?
>>>>> 1.1 and 1.2 are almost identical from XC-specific features point of view.
>>>>> 1.2 comes with new PG 9.3 features.
>>>>>
>>>>> Postgres-XC document is available online.   You can find links at
>>>>> https://sourceforge.net/p/postgres-xc/xc-wiki/Documentation/
>>>>>
>>>>> Pgxc_ctl reference is included in it.
>>>>>
>>>>> Cheers;
>>>>> ---
>>>>> Koichi Suzuki
>>>>>
>>>>> 2014/10/15 10:56、Abbas Butt <abb...@en...> のメール：
>>>>>
>>>>>
>>>>>
>>>>> On Wed, Oct 15, 2014 at 12:25 AM, Gilberto Nunes
>>>>> <gil...@gm...> wrote:
>>>>>>
>>>>>> Hi...
>>>>>>
>>>>>> I already deploy 3 VM's with PostgresXC 1.0.4, follow the steps here:
>>>>>>
>>>>>> http://postgresxc.wikia.com/wiki/Real_Server_configuration
>>>>>>
>>>>>> But I need to know how start to work??
>>>>>> Where my application connect to??
>>>>>
>>>>>
>>>>> Your application can connect to any of the coordinators.
>>>>>
>>>>>>
>>>>>>
>>>>>> Thanks for any kind of help........
>>>>>>
>>>>>> --
>>>>>> --
>>>>>>
>>>>>> Gilberto Ferreira
>>>>>>
>>>>>>
>>>>>>
>>>>>> ------------------------------------------------------------------------------
>>>>>> Comprehensive Server Monitoring with Site24x7.
>>>>>> Monitor 10 servers for $9/Month.
>>>>>> Get alerted through email, SMS, voice calls or mobile push
>>>>>> notifications.
>>>>>> Take corrective actions from your mobile device.
>>>>>> http://p.sf.net/sfu/Zoho
>>>>>> _______________________________________________
>>>>>> Postgres-xc-general mailing list
>>>>>> Pos...@li...
>>>>>> https://lists.sourceforge.net/lists/listinfo/postgres-xc-general
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> --
>>>>> Abbas
>>>>> Architect
>>>>>
>>>>> Ph: 92.334.5100153
>>>>> Skype ID: gabbasb
>>>>> www.enterprisedb.com
>>>>>
>>>>> Follow us on Twitter
>>>>> @EnterpriseDB
>>>>>
>>>>> Visit EnterpriseDB for tutorials, webinars, whitepapers and more
>>>>>
>>>>> ------------------------------------------------------------------------------
>>>>> Comprehensive Server Monitoring with Site24x7.
>>>>> Monitor 10 servers for $9/Month.
>>>>> Get alerted through email, SMS, voice calls or mobile push
>>>>> notifications.
>>>>> Take corrective actions from your mobile device.
>>>>> http://p.sf.net/sfu/Zoho_______________________________________________
>>>>> Postgres-xc-general mailing list
>>>>> Pos...@li...
>>>>> https://lists.sourceforge.net/lists/listinfo/postgres-xc-general
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> --
>>>>
>>>> Gilberto Ferreira
>>>>
>>>
>>>
>>>
>>> --
>>> --
>>> Abbas
>>> Architect
>>>
>>> Ph: 92.334.5100153
>>> Skype ID: gabbasb
>>> www.enterprisedb.com
>>>
>>> Follow us on Twitter
>>> @EnterpriseDB
>>>
>>> Visit EnterpriseDB for tutorials, webinars, whitepapers and more
>>
>>
>>
>>
>> --
>> --
>>
>> Gilberto Ferreira
>>
>>
>
>
>
> --
> --
>
> Gilberto Ferreira
>
>
> ------------------------------------------------------------------------------
> Comprehensive Server Monitoring with Site24x7.
> Monitor 10 servers for $9/Month.
> Get alerted through email, SMS, voice calls or mobile push notifications.
> Take corrective actions from your mobile device.
> http://p.sf.net/sfu/Zoho
> _______________________________________________
> Postgres-xc-general mailing list
> Pos...@li...
> https://lists.sourceforge.net/lists/listinfo/postgres-xc-general
>

How to enable dtrace  after installed postgresql-xl in .rpm ‍

First,I installed postgresql-xl  in .rpm not source code.Then I need to enable dtrace to trace ‍dynamicly,How should I do?‍

Hi, i'm studying informatics and we are doing an investigation of
postgres-xc.
I searched information about that everyware and it isn't enough for making
a presentation.
Can you give me a little more information or a document in where I
could see more
technical specifications??
Thanks for all !!!

Santiago Ibarbia.
Spain

I see...
But, let's suppose  if I have XC Cluster on site "A", and that Cluster also
connect with other site "B", which has it own Cluster.

Then, when Site "A" goes off line,  I suppose that when connection back on
line, there's some updates spread to cluster. Or am I wrong thinking like
that?
I'm just trying to understand...

Thank you

2014-10-16 0:30 GMT-03:00 鈴木 幸市 <ko...@in...>:

>  Postgres-XC is based upon tightly coupled distributed database mode,
> which means it generally assumes all the nodes are up and available.
>
>  In reality, if failed node is not involved in a transaction, it will be
> successful.   If you try to update a shard at failed node, or you try to
> update replicated table which the failed node is involved, or if you try to
> issue DDL which is supposed to propagate to all the nodes, such transaction
> will fail.   It is quite hard for XC to allow only partial DDL propagation
> because this will very easily make whole cluster inconsistent when the
> failed node is up and back.
>
>  Hope your application meets this behavior.
>
>  Regards;
> ---
> Koichi Suzuki
>
>  2014/10/15 20:16、Gilberto Nunes <gil...@gm...> のメール：
>
>   Let me explatin
>
>  What I looking for is using Potsgre-XC on distribuited sites... Once this
> site get off line for any reason, link Local Link failure or Cluster Link
> failuer, local application can continue works and once the link get back on
> line, the Postgres-XC sync the local difference with others nodes/databases
> on the others site...
>
>  I need to know if this will be nice, if I use normal adsl...
>
>  Thanks
>
> 2014-10-15 7:52 GMT-03:00 Abbas Butt <abb...@en...>:
>
>>
>>
>> On Wed, Oct 15, 2014 at 3:47 PM, Gilberto Nunes <
>> gil...@gm...> wrote:
>>
>>>  Yep
>>>
>>>  I'll work with 1.2 version... 1.0.4 was just for test purpose and to
>>> understand the concept...
>>>  BTW, can work with ADSL as Internet Link, like 30 MBPS or dedicate link
>>> is recommend?
>>>
>>
>>  Do you mean the link between application and the cluster OR the link
>> between the nodes of the cluster?
>> If you mean the link between application and the cluster you should be OK.
>>
>>    I know there's some others specs that I need to take in mind, like
>>> processors, memory, and so on...
>>>  But  my doubt is if I work with normal ADSL the DB will be work
>>> properly...
>>>
>>>  Thanks
>>>
>>> 2014-10-15 0:01 GMT-03:00 鈴木 幸市 <ko...@in...>:
>>>
>>>  Hell;
>>>>
>>>>  Abbas, thanks for the quick response.
>>>>
>>>>  To start with, pgxc_ctl primer will be a good starting point.
>>>> Pgxc_ctl is postgres-xc cluster configuration/operation utility.
>>>>
>>>>  Tutorial is available at
>>>> https://sourceforge.net/projects/postgres-xc/files/Pgxc_ctl_primer/
>>>>
>>>>  I’m afraid 1.0.x is a bit old.   Why don’t you start with 1.1 or 1.2?
>>>>   1.1 and 1.2 are almost identical from XC-specific features point of view.
>>>>   1.2 comes with new PG 9.3 features.
>>>>
>>>>  Postgres-XC document is available online.   You can find links at
>>>> https://sourceforge.net/p/postgres-xc/xc-wiki/Documentation/
>>>>
>>>>  Pgxc_ctl reference is included in it.
>>>>
>>>>  Cheers;
>>>> ---
>>>> Koichi Suzuki
>>>>
>>>>  2014/10/15 10:56、Abbas Butt <abb...@en...> のメール：
>>>>
>>>>
>>>>
>>>> On Wed, Oct 15, 2014 at 12:25 AM, Gilberto Nunes <
>>>> gil...@gm...> wrote:
>>>>
>>>>>  Hi...
>>>>>
>>>>> I already deploy 3 VM's with PostgresXC 1.0.4, follow the steps here:
>>>>>
>>>>> http://postgresxc.wikia.com/wiki/Real_Server_configuration
>>>>>
>>>>>  But I need to know how start to work??
>>>>>  Where my application connect to??
>>>>>
>>>>
>>>>  Your application can connect to any of the coordinators.
>>>>
>>>>
>>>>>
>>>>>  Thanks for any kind of help........
>>>>>
>>>>> --
>>>>>  --
>>>>>
>>>>>  Gilberto Ferreira
>>>>>
>>>>>
>>>>>
>>>>> ------------------------------------------------------------------------------
>>>>> Comprehensive Server Monitoring with Site24x7.
>>>>> Monitor 10 servers for $9/Month.
>>>>> Get alerted through email, SMS, voice calls or mobile push
>>>>> notifications.
>>>>> Take corrective actions from your mobile device.
>>>>> http://p.sf.net/sfu/Zoho
>>>>> _______________________________________________
>>>>> Postgres-xc-general mailing list
>>>>> Pos...@li...
>>>>> https://lists.sourceforge.net/lists/listinfo/postgres-xc-general
>>>>>
>>>>>
>>>>
>>>>
>>>>  --
>>>> --
>>>> *Abbas*
>>>>  Architect
>>>>
>>>> Ph: 92.334.5100153
>>>>  Skype ID: gabbasb
>>>>  www.enterprisedb.co <http://www.enterprisedb.com/>m
>>>> <http://www.enterprisedb.com/>
>>>>
>>>> * Follow us on Twitter*
>>>> @EnterpriseDB
>>>>
>>>> Visit EnterpriseDB for tutorials, webinars, whitepapers
>>>> <http://www.enterprisedb.com/resources-community> and more
>>>> <http://www.enterprisedb.com/resources-community>
>>>>
>>>> ------------------------------------------------------------------------------
>>>> Comprehensive Server Monitoring with Site24x7.
>>>> Monitor 10 servers for $9/Month.
>>>> Get alerted through email, SMS, voice calls or mobile push
>>>> notifications.
>>>> Take corrective actions from your mobile device.
>>>> http://p.sf.net/sfu/Zoho_______________________________________________
>>>> Postgres-xc-general mailing list
>>>> Pos...@li...
>>>> https://lists.sourceforge.net/lists/listinfo/postgres-xc-general
>>>>
>>>>
>>>>
>>>
>>>
>>> --
>>>  --
>>>
>>>  Gilberto Ferreira
>>>
>>>
>>
>>
>>  --
>> --
>> *Abbas*
>>  Architect
>>
>> Ph: 92.334.5100153
>>  Skype ID: gabbasb
>>  www.enterprisedb.co <http://www.enterprisedb.com/>m
>> <http://www.enterprisedb.com/>
>>
>> * Follow us on Twitter*
>> @EnterpriseDB
>>
>> Visit EnterpriseDB for tutorials, webinars, whitepapers
>> <http://www.enterprisedb.com/resources-community> and more
>> <http://www.enterprisedb.com/resources-community>
>>
>
>
>
> --
>  --
>
>  Gilberto Ferreira
>
>
>


-- 
--

Gilberto Ferreira

Postgres-XC is based upon tightly coupled distributed database mode, which means it generally assumes all the nodes are up and available.

In reality, if failed node is not involved in a transaction, it will be successful.   If you try to update a shard at failed node, or you try to update replicated table which the failed node is involved, or if you try to issue DDL which is supposed to propagate to all the nodes, such transaction will fail.   It is quite hard for XC to allow only partial DDL propagation because this will very easily make whole cluster inconsistent when the failed node is up and back.

Hope your application meets this behavior.

Regards;
---
Koichi Suzuki

2014/10/15 20:16、Gilberto Nunes <gil...@gm...<mailto:gil...@gm...>> のメール：

Let me explatin

What I looking for is using Potsgre-XC on distribuited sites... Once this site get off line for any reason, link Local Link failure or Cluster Link failuer, local application can continue works and once the link get back on line, the Postgres-XC sync the local difference with others nodes/databases on the others site...

I need to know if this will be nice, if I use normal adsl...

Thanks

2014-10-15 7:52 GMT-03:00 Abbas Butt <abb...@en...<mailto:abb...@en...>>:


On Wed, Oct 15, 2014 at 3:47 PM, Gilberto Nunes <gil...@gm...<mailto:gil...@gm...>> wrote:
Yep

I'll work with 1.2 version... 1.0.4 was just for test purpose and to understand the concept...
BTW, can work with ADSL as Internet Link, like 30 MBPS or dedicate link is recommend?

Do you mean the link between application and the cluster OR the link between the nodes of the cluster?
If you mean the link between application and the cluster you should be OK.

I know there's some others specs that I need to take in mind, like processors, memory, and so on...
But  my doubt is if I work with normal ADSL the DB will be work properly...

Thanks

2014-10-15 0:01 GMT-03:00 鈴木 幸市 <koichi@intellilink..co.jp<mailto:ko...@in...>>:

Hell;

Abbas, thanks for the quick response.

To start with, pgxc_ctl primer will be a good starting point.   Pgxc_ctl is postgres-xc cluster configuration/operation utility.

Tutorial is available at https://sourceforge.net/projects/postgres-xc/files/Pgxc_ctl_primer/

I’m afraid 1.0.x is a bit old.   Why don’t you start with 1.1 or 1.2?   1.1 and 1.2 are almost identical from XC-specific features point of view.   1.2 comes with new PG 9.3 features.

Postgres-XC document is available online.   You can find links at https://sourceforge.net/p/postgres-xc/xc-wiki/Documentation/

Pgxc_ctl reference is included in it.

Cheers;
---
Koichi Suzuki

2014/10/15 10:56、Abbas Butt <abb...@en...<mailto:abb...@en...>> のメール：



On Wed, Oct 15, 2014 at 12:25 AM, Gilberto Nunes <gil...@gm...<mailto:gil...@gm...>> wrote:
Hi...

I already deploy 3 VM's with PostgresXC 1.0.4, follow the steps here:

http://postgresxc.wikia.com/wiki/Real_Server_configuration

But I need to know how start to work??
Where my application connect to??

Your application can connect to any of the coordinators.


Thanks for any kind of help........

--
--

Gilberto Ferreira


------------------------------------------------------------------------------
Comprehensive Server Monitoring with Site24x7.
Monitor 10 servers for $9/Month.
Get alerted through email, SMS, voice calls or mobile push notifications.
Take corrective actions from your mobile device.
http://p.sf.net/sfu/Zoho
_______________________________________________
Postgres-xc-general mailing list
Pos...@li...<mailto:Pos...@li...>
https://lists.sourceforge.net/lists/listinfo/postgres-xc-general




--
--
Abbas
Architect

Ph: 92.334.5100153
Skype ID: gabbasb
www.enterprisedb.co<http://www.enterprisedb.com/>m<http://www.enterprisedb.com/>

Follow us on Twitter
@EnterpriseDB

Visit EnterpriseDB for tutorials, webinars, whitepapers<http://www.enterprisedb.com/resources-community> and more<http://www.enterprisedb.com/resources-community>
------------------------------------------------------------------------------
Comprehensive Server Monitoring with Site24x7.
Monitor 10 servers for $9/Month.
Get alerted through email, SMS, voice calls or mobile push notifications.
Take corrective actions from your mobile device.
http://p.sf.net/sfu/Zoho_______________________________________________
Postgres-xc-general mailing list
Pos...@li...<mailto:Pos...@li...>
https://lists.sourceforge.net/lists/listinfo/postgres-xc-general




--
--

Gilberto Ferreira




--
--
Abbas
Architect

Ph: 92.334.5100153
Skype ID: gabbasb
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--
--

Gilberto Ferreira

On Wed, Oct 15, 2014 at 3:47 PM, Gilberto Nunes <gil...@gm...>
wrote:

> Yep
>
> I'll work with 1.2 version... 1.0.4 was just for test purpose and to
> understand the concept...
> BTW, can work with ADSL as Internet Link, like 30 MBPS or dedicate link is
> recommend?
>

Do you mean the link between application and the cluster OR the link
between the nodes of the cluster?
If you mean the link between application and the cluster you should be OK.

I know there's some others specs that I need to take in mind, like
> processors, memory, and so on...
> But  my doubt is if I work with normal ADSL the DB will be work properly...
>
> Thanks
>
> 2014-10-15 0:01 GMT-03:00 鈴木 幸市 <ko...@in...>:
>
>  Hell;
>>
>>  Abbas, thanks for the quick response.
>>
>>  To start with, pgxc_ctl primer will be a good starting point.   Pgxc_ctl
>> is postgres-xc cluster configuration/operation utility.
>>
>>  Tutorial is available at
>> https://sourceforge.net/projects/postgres-xc/files/Pgxc_ctl_primer/
>>
>>  I’m afraid 1.0.x is a bit old.   Why don’t you start with 1.1 or 1.2?
>> 1.1 and 1.2 are almost identical from XC-specific features point of view.
>> 1.2 comes with new PG 9.3 features.
>>
>>  Postgres-XC document is available online.   You can find links at
>> https://sourceforge.net/p/postgres-xc/xc-wiki/Documentation/
>>
>>  Pgxc_ctl reference is included in it.
>>
>>  Cheers;
>> ---
>> Koichi Suzuki
>>
>>  2014/10/15 10:56、Abbas Butt <abb...@en...> のメール：
>>
>>
>>
>> On Wed, Oct 15, 2014 at 12:25 AM, Gilberto Nunes <
>> gil...@gm...> wrote:
>>
>>>  Hi...
>>>
>>> I already deploy 3 VM's with PostgresXC 1.0.4, follow the steps here:
>>>
>>> http://postgresxc.wikia.com/wiki/Real_Server_configuration
>>>
>>>  But I need to know how start to work??
>>>  Where my application connect to??
>>>
>>
>>  Your application can connect to any of the coordinators.
>>
>>
>>>
>>>  Thanks for any kind of help........
>>>
>>> --
>>>  --
>>>
>>>  Gilberto Ferreira
>>>
>>>
>>>
>>> ------------------------------------------------------------------------------
>>> Comprehensive Server Monitoring with Site24x7.
>>> Monitor 10 servers for $9/Month.
>>> Get alerted through email, SMS, voice calls or mobile push notifications.
>>> Take corrective actions from your mobile device.
>>> http://p.sf.net/sfu/Zoho
>>> _______________________________________________
>>> Postgres-xc-general mailing list
>>> Pos...@li...
>>> https://lists.sourceforge.net/lists/listinfo/postgres-xc-general
>>>
>>>
>>
>>
>>  --
>> --
>> *Abbas*
>>  Architect
>>
>> Ph: 92.334.5100153
>>  Skype ID: gabbasb
>>  www.enterprisedb.co <http://www.enterprisedb.com/>m
>> <http://www.enterprisedb.com/>
>>
>> * Follow us on Twitter*
>> @EnterpriseDB
>>
>> Visit EnterpriseDB for tutorials, webinars, whitepapers
>> <http://www.enterprisedb.com/resources-community> and more
>> <http://www.enterprisedb.com/resources-community>
>>
>> ------------------------------------------------------------------------------
>> Comprehensive Server Monitoring with Site24x7.
>> Monitor 10 servers for $9/Month.
>> Get alerted through email, SMS, voice calls or mobile push notifications.
>> Take corrective actions from your mobile device.
>> http://p.sf.net/sfu/Zoho_______________________________________________
>> Postgres-xc-general mailing list
>> Pos...@li...
>> https://lists.sourceforge.net/lists/listinfo/postgres-xc-general
>>
>>
>>
>
>
> --
> --
>
> Gilberto Ferreira
>
>


-- 
-- 
*Abbas*
 Architect

Ph: 92.334.5100153
 Skype ID: gabbasb
www.enterprisedb.co <http://www.enterprisedb.com/>m
<http://www.enterprisedb.com/>

*Follow us on Twitter*
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Let me explatin

What I looking for is using Potsgre-XC on distribuited sites... Once this
site get off line for any reason, link Local Link failure or Cluster Link
failuer, local application can continue works and once the link get back on
line, the Postgres-XC sync the local difference with others nodes/databases
on the others site...

I need to know if this will be nice, if I use normal adsl...

Thanks

2014-10-15 7:52 GMT-03:00 Abbas Butt <abb...@en...>:

>
>
> On Wed, Oct 15, 2014 at 3:47 PM, Gilberto Nunes <
> gil...@gm...> wrote:
>
>> Yep
>>
>> I'll work with 1.2 version... 1.0.4 was just for test purpose and to
>> understand the concept...
>> BTW, can work with ADSL as Internet Link, like 30 MBPS or dedicate link
>> is recommend?
>>
>
> Do you mean the link between application and the cluster OR the link
> between the nodes of the cluster?
> If you mean the link between application and the cluster you should be OK.
>
> I know there's some others specs that I need to take in mind, like
>> processors, memory, and so on...
>> But  my doubt is if I work with normal ADSL the DB will be work
>> properly...
>>
>> Thanks
>>
>> 2014-10-15 0:01 GMT-03:00 鈴木 幸市 <ko...@in...>:
>>
>>  Hell;
>>>
>>>  Abbas, thanks for the quick response.
>>>
>>>  To start with, pgxc_ctl primer will be a good starting point.
>>> Pgxc_ctl is postgres-xc cluster configuration/operation utility.
>>>
>>>  Tutorial is available at
>>> https://sourceforge.net/projects/postgres-xc/files/Pgxc_ctl_primer/
>>>
>>>  I’m afraid 1.0.x is a bit old.   Why don’t you start with 1.1 or 1.2?
>>>   1.1 and 1.2 are almost identical from XC-specific features point of view.
>>>   1.2 comes with new PG 9.3 features.
>>>
>>>  Postgres-XC document is available online.   You can find links at
>>> https://sourceforge.net/p/postgres-xc/xc-wiki/Documentation/
>>>
>>>  Pgxc_ctl reference is included in it.
>>>
>>>  Cheers;
>>> ---
>>> Koichi Suzuki
>>>
>>>  2014/10/15 10:56、Abbas Butt <abb...@en...> のメール：
>>>
>>>
>>>
>>> On Wed, Oct 15, 2014 at 12:25 AM, Gilberto Nunes <
>>> gil...@gm...> wrote:
>>>
>>>>  Hi...
>>>>
>>>> I already deploy 3 VM's with PostgresXC 1.0.4, follow the steps here:
>>>>
>>>> http://postgresxc.wikia.com/wiki/Real_Server_configuration
>>>>
>>>>  But I need to know how start to work??
>>>>  Where my application connect to??
>>>>
>>>
>>>  Your application can connect to any of the coordinators.
>>>
>>>
>>>>
>>>>  Thanks for any kind of help........
>>>>
>>>> --
>>>>  --
>>>>
>>>>  Gilberto Ferreira
>>>>
>>>>
>>>>
>>>> ------------------------------------------------------------------------------
>>>> Comprehensive Server Monitoring with Site24x7.
>>>> Monitor 10 servers for $9/Month.
>>>> Get alerted through email, SMS, voice calls or mobile push
>>>> notifications.
>>>> Take corrective actions from your mobile device.
>>>> http://p.sf.net/sfu/Zoho
>>>> _______________________________________________
>>>> Postgres-xc-general mailing list
>>>> Pos...@li...
>>>> https://lists.sourceforge.net/lists/listinfo/postgres-xc-general
>>>>
>>>>
>>>
>>>
>>>  --
>>> --
>>> *Abbas*
>>>  Architect
>>>
>>> Ph: 92.334.5100153
>>>  Skype ID: gabbasb
>>>  www.enterprisedb.co <http://www.enterprisedb.com/>m
>>> <http://www.enterprisedb.com/>
>>>
>>> * Follow us on Twitter*
>>> @EnterpriseDB
>>>
>>> Visit EnterpriseDB for tutorials, webinars, whitepapers
>>> <http://www.enterprisedb.com/resources-community> and more
>>> <http://www.enterprisedb.com/resources-community>
>>>
>>> ------------------------------------------------------------------------------
>>> Comprehensive Server Monitoring with Site24x7.
>>> Monitor 10 servers for $9/Month.
>>> Get alerted through email, SMS, voice calls or mobile push notifications.
>>> Take corrective actions from your mobile device.
>>> http://p.sf.net/sfu/Zoho_______________________________________________
>>> Postgres-xc-general mailing list
>>> Pos...@li...
>>> https://lists.sourceforge.net/lists/listinfo/postgres-xc-general
>>>
>>>
>>>
>>
>>
>> --
>> --
>>
>> Gilberto Ferreira
>>
>>
>
>
> --
> --
> *Abbas*
>  Architect
>
> Ph: 92.334.5100153
>  Skype ID: gabbasb
> www.enterprisedb.co <http://www.enterprisedb.com/>m
> <http://www.enterprisedb.com/>
>
> *Follow us on Twitter*
> @EnterpriseDB
>
> Visit EnterpriseDB for tutorials, webinars, whitepapers
> <http://www.enterprisedb.com/resources-community> and more
> <http://www.enterprisedb.com/resources-community>
>



-- 
--

Gilberto Ferreira

Yep

I'll work with 1.2 version... 1.0.4 was just for test purpose and to
understand the concept...
BTW, can work with ADSL as Internet Link, like 30 MBPS or dedicate link is
recommend?
I know there's some others specs that I need to take in mind, like
processors, memory, and so on...
But  my doubt is if I work with normal ADSL the DB will be work properly...

Thanks

2014-10-15 0:01 GMT-03:00 鈴木 幸市 <ko...@in...>:

>  Hell;
>
>  Abbas, thanks for the quick response.
>
>  To start with, pgxc_ctl primer will be a good starting point.   Pgxc_ctl
> is postgres-xc cluster configuration/operation utility.
>
>  Tutorial is available at
> https://sourceforge.net/projects/postgres-xc/files/Pgxc_ctl_primer/
>
>  I’m afraid 1.0.x is a bit old.   Why don’t you start with 1.1 or 1.2?
> 1.1 and 1.2 are almost identical from XC-specific features point of view.
> 1.2 comes with new PG 9.3 features.
>
>  Postgres-XC document is available online.   You can find links at
> https://sourceforge.net/p/postgres-xc/xc-wiki/Documentation/
>
>  Pgxc_ctl reference is included in it.
>
>  Cheers;
> ---
> Koichi Suzuki
>
>  2014/10/15 10:56、Abbas Butt <abb...@en...> のメール：
>
>
>
> On Wed, Oct 15, 2014 at 12:25 AM, Gilberto Nunes <
> gil...@gm...> wrote:
>
>>  Hi...
>>
>> I already deploy 3 VM's with PostgresXC 1.0.4, follow the steps here:
>>
>> http://postgresxc.wikia.com/wiki/Real_Server_configuration
>>
>>  But I need to know how start to work??
>>  Where my application connect to??
>>
>
>  Your application can connect to any of the coordinators.
>
>
>>
>>  Thanks for any kind of help........
>>
>> --
>>  --
>>
>>  Gilberto Ferreira
>>
>>
>>
>> ------------------------------------------------------------------------------
>> Comprehensive Server Monitoring with Site24x7.
>> Monitor 10 servers for $9/Month.
>> Get alerted through email, SMS, voice calls or mobile push notifications.
>> Take corrective actions from your mobile device.
>> http://p.sf.net/sfu/Zoho
>> _______________________________________________
>> Postgres-xc-general mailing list
>> Pos...@li...
>> https://lists.sourceforge.net/lists/listinfo/postgres-xc-general
>>
>>
>
>
>  --
> --
> *Abbas*
>  Architect
>
> Ph: 92.334.5100153
>  Skype ID: gabbasb
>  www.enterprisedb.co <http://www.enterprisedb.com/>m
> <http://www.enterprisedb.com/>
>
> * Follow us on Twitter*
> @EnterpriseDB
>
> Visit EnterpriseDB for tutorials, webinars, whitepapers
> <http://www.enterprisedb.com/resources-community> and more
> <http://www.enterprisedb.com/resources-community>
>
> ------------------------------------------------------------------------------
> Comprehensive Server Monitoring with Site24x7.
> Monitor 10 servers for $9/Month.
> Get alerted through email, SMS, voice calls or mobile push notifications.
> Take corrective actions from your mobile device.
> http://p.sf.net/sfu/Zoho_______________________________________________
> Postgres-xc-general mailing list
> Pos...@li...
> https://lists.sourceforge.net/lists/listinfo/postgres-xc-general
>
>
>


-- 
--

Gilberto Ferreira

Hell;

Abbas, thanks for the quick response.

To start with, pgxc_ctl primer will be a good starting point.   Pgxc_ctl is postgres-xc cluster configuration/operation utility.

Tutorial is available at https://sourceforge.net/projects/postgres-xc/files/Pgxc_ctl_primer/

I’m afraid 1.0.x is a bit old.   Why don’t you start with 1.1 or 1.2?   1.1 and 1.2 are almost identical from XC-specific features point of view.   1.2 comes with new PG 9.3 features.

Postgres-XC document is available online.   You can find links at https://sourceforge.net/p/postgres-xc/xc-wiki/Documentation/

Pgxc_ctl reference is included in it.

Cheers;
---
Koichi Suzuki

2014/10/15 10:56、Abbas Butt <abb...@en...<mailto:abb...@en...>> のメール：



On Wed, Oct 15, 2014 at 12:25 AM, Gilberto Nunes <gil...@gm...<mailto:gil...@gm...>> wrote:
Hi...

I already deploy 3 VM's with PostgresXC 1.0.4, follow the steps here:

http://postgresxc.wikia.com/wiki/Real_Server_configuration

But I need to know how start to work??
Where my application connect to??

Your application can connect to any of the coordinators.


Thanks for any kind of help........

--
--

Gilberto Ferreira


------------------------------------------------------------------------------
Comprehensive Server Monitoring with Site24x7.
Monitor 10 servers for $9/Month.
Get alerted through email, SMS, voice calls or mobile push notifications.
Take corrective actions from your mobile device.
http://p.sf.net/sfu/Zoho
_______________________________________________
Postgres-xc-general mailing list
Pos...@li...<mailto:Pos...@li...>
https://lists.sourceforge.net/lists/listinfo/postgres-xc-general




--
--
Abbas
Architect

Ph: 92.334.5100153
Skype ID: gabbasb
www.enterprisedb.co<http://www.enterprisedb.com/>m<http://www.enterprisedb.com/>

Follow us on Twitter
@EnterpriseDB

Visit EnterpriseDB for tutorials, webinars, whitepapers<http://www.enterprisedb.com/resources-community> and more<http://www.enterprisedb.com/resources-community>
------------------------------------------------------------------------------
Comprehensive Server Monitoring with Site24x7.
Monitor 10 servers for $9/Month.
Get alerted through email, SMS, voice calls or mobile push notifications.
Take corrective actions from your mobile device.
http://p.sf.net/sfu/Zoho_______________________________________________
Postgres-xc-general mailing list
Pos...@li...
https://lists.sourceforge.net/lists/listinfo/postgres-xc-general

On Wed, Oct 15, 2014 at 12:25 AM, Gilberto Nunes <gil...@gm...
> wrote:

> Hi...
>
> I already deploy 3 VM's with PostgresXC 1.0.4, follow the steps here:
>
> http://postgresxc.wikia.com/wiki/Real_Server_configuration
>
> But I need to know how start to work??
> Where my application connect to??
>

Your application can connect to any of the coordinators.


>
> Thanks for any kind of help........
>
> --
> --
>
> Gilberto Ferreira
>
>
>
> ------------------------------------------------------------------------------
> Comprehensive Server Monitoring with Site24x7.
> Monitor 10 servers for $9/Month.
> Get alerted through email, SMS, voice calls or mobile push notifications.
> Take corrective actions from your mobile device.
> http://p.sf.net/sfu/Zoho
> _______________________________________________
> Postgres-xc-general mailing list
> Pos...@li...
> https://lists.sourceforge.net/lists/listinfo/postgres-xc-general
>
>


-- 
-- 
*Abbas*
 Architect

Ph: 92.334.5100153
 Skype ID: gabbasb
www.enterprisedb.co <http://www.enterprisedb.com/>m
<http://www.enterprisedb.com/>

*Follow us on Twitter*
@EnterpriseDB

Visit EnterpriseDB for tutorials, webinars, whitepapers
<http://www.enterprisedb.com/resources-community> and more
<http://www.enterprisedb.com/resources-community>

Hi...

I already deploy 3 VM's with PostgresXC 1.0.4, follow the steps here:

http://postgresxc.wikia.com/wiki/Real_Server_configuration

But I need to know how start to work??
Where my application connect to??

Thanks for any kind of help........

-- 
--

Gilberto Ferreira

Hi,

ada...@gm... wants to follow you.

****** Is ada...@gm... you friend? ******
If Yes please follow the link below:
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If No please follow the link below:
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Nice...

Thanks for help me

2014-10-08 20:34 GMT-03:00 Michael Paquier <mic...@gm...>:

>
>
> On Wed, Oct 8, 2014 at 10:23 PM, Gilberto Nunes <
> gil...@gm...> wrote:
>
>> So, in other words, I will have this on the clients ( nodes ) and not on
>> the central DB (coordinators).
>> Sorry if I do not understand cleary what you explain... I am really new
>> in DB world...
>>
> A Postgres-XC cluster is made of a series of Coordinator and Datanodes.
> But instead of explaining it by email, I highly recommend that you read
> some related documentation that can easily be found on the net and
> understand its infrastructure before even trying to use it. Here is for
> example one:
>
> https://wiki.postgresql.org/images/4/44/Postgres-XC_Write-Scalable_Cluster.pdf
>
> I don't really know what you are trying to solve, but before exploring XC
> you should consider as well more simple solutions like a single PostgreSQL
> server coupled with some read-only standbys if you are really new in
> working on such systems. Multi-master looks great on the paper, with costs
> in either hardware, data availability or performance.
> Regards,
> --
> Michael
>



-- 
--

Gilberto Ferreira

On Wed, Oct 8, 2014 at 10:23 PM, Gilberto Nunes <gil...@gm...>
wrote:

> So, in other words, I will have this on the clients ( nodes ) and not on
> the central DB (coordinators).
> Sorry if I do not understand cleary what you explain... I am really new in
> DB world...
>
A Postgres-XC cluster is made of a series of Coordinator and Datanodes. But
instead of explaining it by email, I highly recommend that you read some
related documentation that can easily be found on the net and understand
its infrastructure before even trying to use it. Here is for example one:
https://wiki.postgresql.org/images/4/44/Postgres-XC_Write-Scalable_Cluster.pdf

I don't really know what you are trying to solve, but before exploring XC
you should consider as well more simple solutions like a single PostgreSQL
server coupled with some read-only standbys if you are really new in
working on such systems. Multi-master looks great on the paper, with costs
in either hardware, data availability or performance.
Regards,
-- 
Michael

So, in other words, I will have this on the clients ( nodes ) and not on
the central DB ( coordinators ).
Sorry if I do not understand cleary what you explain... I am really new in
DB world...


2014-10-08 10:12 GMT-03:00 Michael Paquier <mic...@gm...>:

>
>
> On Wed, Oct 8, 2014 at 9:36 PM, Gilberto Nunes <gil...@gm...
> > wrote:
>
>> Let say if I have two store and the DB is deploy under postgres-xc. Now
>> Store A, record a register like 00010, and Store B record a register like
>> 00010 two.
>> And both sites write this locally and in a center DB with postgres-xc
>> too, of course...
>> How postgres-xc will handle with this? Or I will need create differents
>> ID for both Store like A00010, for Store A, and B00010, fo Store B.
>>
> Note the definition of constraints is strictly related to the distribution
> of the table they are defined on. For example, in the case of hash tables,
> primary keys and unique constraints need absolutely to contain the column
> sharded. For replicated tables, there is no real restriction, at the cost
> that each write needs to be done with 2PC on all the nodes. Btw, what I
> meant in this explanation is something that you have perhaps already
> guessed: constraint definition restriction is here because XC guarantees
> only constraint checks on the datanodes, and not on coordinators.
> --
> Michael
>



-- 
--

Gilberto Ferreira

On Wed, Oct 8, 2014 at 9:36 PM, Gilberto Nunes <gil...@gm...>
wrote:

> Let say if I have two store and the DB is deploy under postgres-xc. Now
> Store A, record a register like 00010, and Store B record a register like
> 00010 two.
> And both sites write this locally and in a center DB with postgres-xc too,
> of course...
> How postgres-xc will handle with this? Or I will need create differents ID
> for both Store like A00010, for Store A, and B00010, fo Store B.
>
Note the definition of constraints is strictly related to the distribution
of the table they are defined on. For example, in the case of hash tables,
primary keys and unique constraints need absolutely to contain the column
sharded. For replicated tables, there is no real restriction, at the cost
that each write needs to be done with 2PC on all the nodes. Btw, what I
meant in this explanation is something that you have perhaps already
guessed: constraint definition restriction is here because XC guarantees
only constraint checks on the datanodes, and not on coordinators.
-- 
Michael

Hello guys

That is my first post, and I wonder if postgres-xc can handle with PK
conflict...
Let me explain...

Let say if I have two store and the DB is deploy under postgres-xc. Now
Store A, record a register like 00010, and Store B record a register like
00010 two.
And both sites write this locally and in a center DB with postgres-xc too,
of course...
How postgres-xc will handle with this? Or I will need create differents ID
for both Store like A00010, for Store A, and B00010, fo Store B.

Thanks for all help

-- 
--

Gilberto Ferreira

XC needs some more infrastructure to be such kind of HA, besides automatic monitoring and failover RA.

1. Maintain replica of each piece of distributed tables,
2. Allow operation to run with some of the nodes missing.

I don’t think its high technical challenge but will need some development resources.

Regards;
---
Koichi Suzuki

2014/08/22 5:59、Mason Sharp <ms...@tr...<mailto:ms...@tr...>> のメール：



On Thu, Aug 21, 2014 at 4:32 PM, Joseph Mays <ma...@wi...<mailto:ma...@wi...>> wrote:
What they are looking for in the end is high-availability and load balancing. They want either system to be able to receive read and write requests, and for either one to be able to take over all the work if the other is down. My understanding is that postgres-xc is capable of this, it’s just a matter of getting there from where they are. All of this would be easier if their current database server weren’t running on one of the machines that needs to be in the two-machine cluster when we’re done.

And yes, minimizing downtime is a priority, too.


How heavy are the writes? If it is read-mainly, you could be ok. With what you describe, all tables would have to be designated as replicated, adding latency. Or, you could define two datanodes, and have a warm standby on each of the other's portion.

In any event, Postgres-XC does not have automated high availability. You would have to have something external monitor and decide when to failover. I have used Corosync/Pacemaker for example.


--
Mason Sharp

TransLattice - http://www.translattice.com<http://www.translattice.com/>
Distributed and Clustered Database Solutions


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On Thu, Aug 21, 2014 at 4:32 PM, Joseph Mays <ma...@wi...> wrote:

>   What they are looking for in the end is high-availability and load
> balancing. They want either system to be able to receive read and write
> requests, and for either one to be able to take over all the work if the
> other is down. My understanding is that postgres-xc is capable of this,
> it’s just a matter of getting there from where they are. All of this would
> be easier if their current database server weren’t running on one of the
> machines that needs to be in the two-machine cluster when we’re done.
>
> And yes, minimizing downtime is a priority, too.
>
>

How heavy are the writes? If it is read-mainly, you could be ok. With what
you describe, all tables would have to be designated as replicated, adding
latency. Or, you could define two datanodes, and have a warm standby on
each of the other's portion.

In any event, Postgres-XC does not have automated high availability. You
would have to have something external monitor and decide when to failover.
I have used Corosync/Pacemaker for example.


-- 
Mason Sharp

TransLattice - http://www.translattice.com
Distributed and Clustered Database Solutions