postgres-xc-general Mailing List for Postgres-XC

Thanks Michael for the advice.

For more tips you should do, please look into a bash script pgxc_ctl
available at
https://github.com/koichi-szk/PGXC-Tools/tree/master/pgxc_ctl

Regards;
----------
Koichi Suzuki


2013/2/22 Michael Paquier <mic...@gm...>:
>
>
> On Fri, Feb 22, 2013 at 2:29 PM, kushal <kus...@gm...> wrote:
>>
>> Hi
>>
>> I am trying to create a setup with 2 coordinators and 2 datanodes on one
>> server. I am able to get the gtm and nodes up and running.
>>
>> Ports:
>> Data Node 1: 15442
>> Data Node 2: 15443
>> Coordinator 1: 15432
>> Coordinator 1: 15433
>>
>> Next I did 'psql -p 15432 postgres' and created two datanodes
>> CREATE NODE dn1 WITH (TYPE='datanode', PORT=15442);
>> CREATE NODE dn2 WITH (TYPE='datanode', PORT=15443);
>>
>> After that I create one database: 'Create database mydb'
>>
>> Now I can see mydb database on datanodes 1 and 2 and coordinator 1.
>> Also I can see the datanode 1 and 2 when I execute 'select * from
>> pgxc_node' on coordinator 1.
>>
>> But mydb database does not exist and datanodes 1 and 2 are not present in
>> pgxc_node table on coordinator 2.
>>
>> Is there anything I have missed?
>
> Yes, 2 things:
> - You have 2 Coordinators, so you need also to register Coordinator 2 on
> Coordinator 1 like that:
> psql -p 15432 -c "CREATE NODE coord2 WITH (TYPE='coordinator', PORT=15433)"
> And register Coordinator 1 on Coordinator 2 like that:
> psql -p 15433 -c "CREATE NODE coord1 WITH (TYPE='coordinator', PORT=15432)"
> - 2nd thing you forgot is to run this command on each Coordinator:
> select pgxc_pool_reload();
> This updates the pooler cache located on each Coordinator with latest node
> information.
>
>> I think this might be a very basic thing and I am sorry to bother you
>> guys. I tried and failed to search through the xc mailing lists for older
>> posts on similar topic. Is there a way to quickly filter the older posts for
>> quick check?
>
> Everything's here:
> http://sourceforge.net/search/?group_id=311227&type_of_search=mlists&source=navbar
> --
> Michael
>
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>

Thanks Michael. It worked.

On 22 February 2013 12:35, Michael Paquier <mic...@gm...>wrote:

>
>
> On Fri, Feb 22, 2013 at 3:45 PM, kushal <kus...@gm...> wrote:
>
>> Its still not working. So here is what I have done. I dropped mydb
>> database. I dropped data nodes from both coordinators.
>> Then I ran:
>> psql -p 15432 -c "CREATE NODE coord2 WITH (TYPE='coordinator',
>> PORT=15433)"
>>  psql -p 15433 -c "CREATE NODE coord1 WITH (TYPE='coordinator',
>> PORT=15432)"
>> select pgxc_pool_reload(); on each coordinator
>>
>> Then I created datanode 1 on coord1.
>> Again I ran select pgxc_pool_reload(); on each coordinator. Still I
>> cannot see datanode1 entry on coordinator 2.
>>
> Meh? I don't really think you understood what I was explaining. You need
> to create *all* the remote nodes on each Coordinator.
> So on Coordinator 1: create Co2, Dn1 and Dn2.
> and on Coordinator 2: create Co1, Dn1 and Dn2.
>
> So...
> Here is what you need to launch as commands on your server:
> # Register Coordinators on each other Coordinator
>
> psql -p 15432 -c "CREATE NODE coord2 WITH (TYPE='coordinator', PORT=15433)"
>  psql -p 15433 -c "CREATE NODE coord1 WITH (TYPE='coordinator',
> PORT=15432)"
> # Register Datanodes on Coordinator 1 and update cache
> psql -p 15432 -c "CREATE NODE dn1 WITH (TYPE='datanode', PORT=15442)"
> psql -p 15432 -c "CREATE NODE dn2 WITH (TYPE='datanode', PORT=15443)"
> psql -p 15432 -c "select pgxc_pool_reload()"
> # Register Datanodes on Coordinator 2 and update cache
> psql -p 15433 -c "CREATE NODE dn1 WITH (TYPE='datanode', PORT=15442)"
> psql -p 15433 -c "CREATE NODE dn2 WITH (TYPE='datanode', PORT=15443)"
> psql -p 15433 -c "select pgxc_pool_reload()"
>
> And you are done.
>
>
>> Also I noticed that under the table pgxc_node on coord1, there is an
>> entry for coord1 with port as 5432, whereas the actual port for coord1 is
>> 15432.
>>
> Don't worry about that this is a dummy entry.
>
>
>> Similarly on coord2, the self port under pgxc_node is 5432, but actual
>> value is 15433. I am not sure whether this is ok.
>>
> This is perfectly fine. You could still use ALTER NODE to update the port
> value to your needs, but this is not necessary at all as a node is not
> going to connect to itself
> --
> Michael
>

On Fri, Feb 22, 2013 at 3:45 PM, kushal <kus...@gm...> wrote:

> Its still not working. So here is what I have done. I dropped mydb
> database. I dropped data nodes from both coordinators.
> Then I ran:
> psql -p 15432 -c "CREATE NODE coord2 WITH (TYPE='coordinator', PORT=15433)"
> psql -p 15433 -c "CREATE NODE coord1 WITH (TYPE='coordinator', PORT=15432)"
> select pgxc_pool_reload(); on each coordinator
>
> Then I created datanode 1 on coord1.
> Again I ran select pgxc_pool_reload(); on each coordinator. Still I cannot
> see datanode1 entry on coordinator 2.
>
Meh? I don't really think you understood what I was explaining. You need to
create *all* the remote nodes on each Coordinator.
So on Coordinator 1: create Co2, Dn1 and Dn2.
and on Coordinator 2: create Co1, Dn1 and Dn2.

So...
Here is what you need to launch as commands on your server:
# Register Coordinators on each other Coordinator
psql -p 15432 -c "CREATE NODE coord2 WITH (TYPE='coordinator', PORT=15433)"
psql -p 15433 -c "CREATE NODE coord1 WITH (TYPE='coordinator', PORT=15432)"
# Register Datanodes on Coordinator 1 and update cache
psql -p 15432 -c "CREATE NODE dn1 WITH (TYPE='datanode', PORT=15442)"
psql -p 15432 -c "CREATE NODE dn2 WITH (TYPE='datanode', PORT=15443)"
psql -p 15432 -c "select pgxc_pool_reload()"
# Register Datanodes on Coordinator 2 and update cache
psql -p 15433 -c "CREATE NODE dn1 WITH (TYPE='datanode', PORT=15442)"
psql -p 15433 -c "CREATE NODE dn2 WITH (TYPE='datanode', PORT=15443)"
psql -p 15433 -c "select pgxc_pool_reload()"

And you are done.


> Also I noticed that under the table pgxc_node on coord1, there is an entry
> for coord1 with port as 5432, whereas the actual port for coord1 is 15432.
>
Don't worry about that this is a dummy entry.


> Similarly on coord2, the self port under pgxc_node is 5432, but actual
> value is 15433. I am not sure whether this is ok.
>
This is perfectly fine. You could still use ALTER NODE to update the port
value to your needs, but this is not necessary at all as a node is not
going to connect to itself
-- 
Michael

Its still not working. So here is what I have done. I dropped mydb
database. I dropped data nodes from both coordinators.

Then I ran:
psql -p 15432 -c "CREATE NODE coord2 WITH (TYPE='coordinator', PORT=15433)"
psql -p 15433 -c "CREATE NODE coord1 WITH (TYPE='coordinator', PORT=15432)"
select pgxc_pool_reload(); on each coordinator

Then I created datanode 1 on coord1.
Again I ran select pgxc_pool_reload(); on each coordinator. Still I cannot
see datanode1 entry on coordinator 2.

Also I noticed that under the table pgxc_node on coord1, there is an entry
for coord1 with port as 5432, whereas the actual port for coord1 is 15432.
Similarly on coord2, the self port under pgxc_node is 5432, but actual
value is 15433. I am not sure whether this is ok.

Regards
Kushal


On 22 February 2013 11:37, Michael Paquier <mic...@gm...>wrote:

>
>
> On Fri, Feb 22, 2013 at 2:29 PM, kushal <kus...@gm...> wrote:
>
>> Hi
>>
>> I am trying to create a setup with 2 coordinators and 2 datanodes on one
>> server. I am able to get the gtm and nodes up and running.
>>
>> Ports:
>> Data Node 1: 15442
>> Data Node 2: 15443
>> Coordinator 1: 15432
>> Coordinator 1: 15433
>>
>> Next I did 'psql -p 15432 postgres' and created two datanodes
>> CREATE NODE dn1 WITH (TYPE='datanode', PORT=15442);
>> CREATE NODE dn2 WITH (TYPE='datanode', PORT=15443);
>>
>> After that I create one database: 'Create database mydb'
>>
>> Now I can see mydb database on datanodes 1 and 2 and coordinator 1.
>> Also I can see the datanode 1 and 2 when I execute 'select * from
>> pgxc_node' on coordinator 1.
>>
>> But mydb database does not exist and datanodes 1 and 2 are not present in
>> pgxc_node table on coordinator 2.
>>
>> Is there anything I have missed?
>>
> Yes, 2 things:
> - You have 2 Coordinators, so you need also to register Coordinator 2 on
> Coordinator 1 like that:
> psql -p 15432 -c "CREATE NODE coord2 WITH (TYPE='coordinator', PORT=15433)"
> And register Coordinator 1 on Coordinator 2 like that:
> psql -p 15433 -c "CREATE NODE coord1 WITH (TYPE='coordinator', PORT=15432)"
> - 2nd thing you forgot is to run this command on each Coordinator:
> select pgxc_pool_reload();
> This updates the pooler cache located on each Coordinator with latest node
> information.
>
> I think this might be a very basic thing and I am sorry to bother you
>> guys. I tried and failed to search through the xc mailing lists for older
>> posts on similar topic. Is there a way to quickly filter the older posts
>> for quick check?
>>
> Everything's here:
>
> http://sourceforge.net/search/?group_id=311227&type_of_search=mlists&source=navbar
> --
> Michael
>

On Fri, Feb 22, 2013 at 2:29 PM, kushal <kus...@gm...> wrote:

> Hi
>
> I am trying to create a setup with 2 coordinators and 2 datanodes on one
> server. I am able to get the gtm and nodes up and running.
>
> Ports:
> Data Node 1: 15442
> Data Node 2: 15443
> Coordinator 1: 15432
> Coordinator 1: 15433
>
> Next I did 'psql -p 15432 postgres' and created two datanodes
> CREATE NODE dn1 WITH (TYPE='datanode', PORT=15442);
> CREATE NODE dn2 WITH (TYPE='datanode', PORT=15443);
>
> After that I create one database: 'Create database mydb'
>
> Now I can see mydb database on datanodes 1 and 2 and coordinator 1.
> Also I can see the datanode 1 and 2 when I execute 'select * from
> pgxc_node' on coordinator 1.
>
> But mydb database does not exist and datanodes 1 and 2 are not present in
> pgxc_node table on coordinator 2.
>
> Is there anything I have missed?
>
Yes, 2 things:
- You have 2 Coordinators, so you need also to register Coordinator 2 on
Coordinator 1 like that:
psql -p 15432 -c "CREATE NODE coord2 WITH (TYPE='coordinator', PORT=15433)"
And register Coordinator 1 on Coordinator 2 like that:
psql -p 15433 -c "CREATE NODE coord1 WITH (TYPE='coordinator', PORT=15432)"
- 2nd thing you forgot is to run this command on each Coordinator:
select pgxc_pool_reload();
This updates the pooler cache located on each Coordinator with latest node
information.

I think this might be a very basic thing and I am sorry to bother you guys.
> I tried and failed to search through the xc mailing lists for older posts
> on similar topic. Is there a way to quickly filter the older posts for
> quick check?
>
Everything's here:
http://sourceforge.net/search/?group_id=311227&type_of_search=mlists&source=navbar
-- 
Michael

Hi

I am trying to create a setup with 2 coordinators and 2 datanodes on one
server. I am able to get the gtm and nodes up and running.

Ports:
Data Node 1: 15442
Data Node 2: 15443
Coordinator 1: 15432
Coordinator 1: 15433

Next I did 'psql -p 15432 postgres' and created two datanodes
CREATE NODE dn1 WITH (TYPE='datanode', PORT=15442);
CREATE NODE dn2 WITH (TYPE='datanode', PORT=15443);

After that I create one database: 'Create database mydb'

Now I can see mydb database on datanodes 1 and 2 and coordinator 1.
Also I can see the datanode 1 and 2 when I execute 'select * from
pgxc_node' on coordinator 1.

But mydb database does not exist and datanodes 1 and 2 are not present in
pgxc_node table on coordinator 2.

Is there anything I have missed?


I think this might be a very basic thing and I am sorry to bother you guys.
I tried and failed to search through the xc mailing lists for older posts
on similar topic. Is there a way to quickly filter the older posts for
quick check?

Thanks
Kushal