From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
---|---|
To: | Kuntal Ghosh <kuntalghosh(dot)2007(at)gmail(dot)com> |
Cc: | Mithun Cy <mithun(dot)cy(at)enterprisedb(dot)com>, Catalin Iacob <iacobcatalin(at)gmail(dot)com>, "Tsunakawa, Takayuki" <tsunakawa(dot)takay(at)jp(dot)fujitsu(dot)com>, Craig Ringer <craig(at)2ndquadrant(dot)com>, Peter van Hardenberg <pvh(at)pvh(dot)ca>, Peter Eisentraut <peter_e(at)gmx(dot)net>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Patch: Implement failover on libpq connect level. |
Date: | 2016-11-29 20:14:48 |
Message-ID: | CA+TgmoZ2nQk2ajoxrJf9sY=vQ0J8tAPHtud7ch=7oq5-sr_sdw@mail.gmail.com |
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Lists: | pgsql-hackers pgsql-jdbc |
On Tue, Nov 29, 2016 at 3:14 PM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> On Tue, Nov 29, 2016 at 2:19 PM, Kuntal Ghosh
> <kuntalghosh(dot)2007(at)gmail(dot)com> wrote:
>> On Thu, Nov 24, 2016 at 5:46 PM, Mithun Cy <mithun(dot)cy(at)enterprisedb(dot)com> wrote:
>>> I have taken this suggestion now renamed target_server_type to
>>> target_session_attrs with possible 2 values "read-write", "any".
>>> May be we could expand to "readonly" and "prefer-readonly" in next patch
>>> proposal. Attaching the patch for same.
>> I was doing some testing with the patch and I found some inconsistency
>> in the error message.
>> I've a read-only server running on port 5433 and no server on 5436 and 5438.
>>
>> command: bin/psql
>> 'postgresql://localhost:5436,localhost:5433,localhost:5438/postgres?target_session_attrs=read-write'
>>
>> I get the following error message.
>>
>> psql: could not make a writable connection to server "localhost:5433"
>> could not connect to server: Connection refused
>> Is the server running on host "localhost" (::1) and accepting
>> TCP/IP connections on port 5438?
>> could not connect to server: Connection refused
>> Is the server running on host "localhost" (127.0.0.1) and accepting
>> TCP/IP connections on port 5438?
>>
>> It didn't show any error message for port 5436. But, if I modify the
>> connection string as following:
>>
>> command: bin/psql
>> 'postgresql://localhost:5433,localhost:5436,localhost:5438/postgres?target_session_attrs=read-write'
>>
>> I get the following error message:
>>
>> psql: could not make a writable connection to server "localhost:5433"
>> could not connect to server: Connection refused
>> Is the server running on host "localhost" (::1) and accepting
>> TCP/IP connections on port 5436?
>> could not connect to server: Connection refused
>> Is the server running on host "localhost" (127.0.0.1) and accepting
>> TCP/IP connections on port 5436?
>> could not connect to server: Connection refused
>> Is the server running on host "localhost" (::1) and accepting
>> TCP/IP connections on port 5438?
>> could not connect to server: Connection refused
>> Is the server running on host "localhost" (127.0.0.1) and accepting
>> TCP/IP connections on port 5438?
>
> Hmm, maybe the query buffer is getting cleared someplace in there. We
> might need to save/restore it.
Not the query buffer. conn->errorMessage.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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