Re: [Postgres-xc-developers] Understanding how coordinator collects data from datanodes

[Koichi S. <koi...@gm...>]

Thanks Ashutosh for the reply.

---
Koichi Suzuki

2015-05-15 16:13 GMT+09:00 Ashutosh Bapat <ash...@en...>:

>
>
> On Fri, May 15, 2015 at 12:13 PM, Manikandan Soundarapandian <
> ma...@vt...> wrote:
>
>> Hi,
>>
>> Am trying to understand how the coordinator node collects query results
>> from the datanodes. I see the method handle_response()
>> in ../backend/pgxc/pool/execRemote.c is called for every connection
>> handle. In an infinite for loop, it collects messages from the data
>> nodes and combines the results. I am confused between the two case
>> statements 'D' and 'd'. What is the difference between these two cases?
>> What exactly is the difference between the methods 'HandleDataRow' and
>> 'HandleCopyDataRow' and can you give an example when each of these
>> methods are invoked? Please help. This will help in my research work.
>>
>>
> I guess HandleDataRow handles "data" row of a query result. The other
> function handles the output of COPY command. These two have different forms.
>
>
>> Thanks
>> Mani
>>
>>
>>
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>
>
>
> --
> Best Wishes,
> Ashutosh Bapat
> EnterpriseDB Corporation
> The Postgres Database Company
>
>
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