Re: Patch: Implement failover on libpq connect level.

From: Victor Wagner <vitus(at)wagner(dot)pp(dot)ru>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Patch: Implement failover on libpq connect level.
Date: 2016-08-31 08:13:34
Message-ID: 20160831111334.461689cf@fafnir.local.vm
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-hackers pgsql-jdbc

On Fri, 26 Aug 2016 10:10:33 +0530
Mithun Cy <mithun(dot)cy(at)enterprisedb(dot)com> wrote:

> On Thu, Mar 17, 2016 at 4:47 AM, David Steele <david(at)pgmasters(dot)net>
> wrote:
> >Since there has been no response from the author I have marked this
> >patch
> "returned with feedback". Please feel free >to resubmit for 9.7!
> I have started to work on this patch, and tried to fix some of the
> issues discussed above. The most recent patch 06 has fixed many
> issues which was raised previously which include indefinite looping,
> crashes. And, some of the issues which remain pending are.
>
> 1. Connection status functions PQport, PQhost do not give
> corresponding values of established connection. -- Have attached the
> patch for same.
>
> 2. Default value of readonly parameter is 0, which means should
> connect to master only. So absence of parameter in connection string
> in simple cases like "./psql -p PORT database" fails to connect to
> hot standby server. I think since if readonly=1 means connect to
> any. and readonly=0 means connect to master only, we should change
> the default value to 1, to handle the cases when parameter is not
> specified.
>
> JFYI Interestingly PostgreSql JDBC driver have following options
> targetServerType=any|master|slave|preferSlave for same purpose.
>
> Also did a little bit of patch clean-up.
>
> Also found some minor issues related to build which I am working on.
> 1. make check-world @src/interfaces/ecpg/test/connect fails with
> following error:
> gcc -Wall -Wmissing-prototypes -Wpointer-arith
> -Wdeclaration-after-statement -Wendif-labels
> -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing
> -fwrapv -fexcess-precision=standard -g -O0 -pthread -D_REENTRANT
> -D_THREAD_SAFE -D_POSIX_PTHREAD_SEMANTICS test1.o -L../../ecpglib
> -L../../pgtypeslib -L../../../../../src/interfaces/libpq
> -L../../../../../src/port -L../../../../../src/common -Wl,--as-needed
> -Wl,-rpath,'/home/mithun/edbsrc/patch6bin/lib',--enable-new-dtags
> -lecpg -lpgtypes -lpq -lpgcommon -lpgport -lz -lrt -lcrypt -ldl -lm
> -o test1 ../../../../../src/interfaces/libpq/libpq.so: undefined
> reference to `pg_usleep'
> collect2: error: ld returned 1 exit status
> make[3]: *** [test1] Error 1
> make[3]: Leaving directory `/home/mithun/mynewpost/p1/
> src/interfaces/ecpg/test/connect'
>
> patch has used pg_usleep() which is in L../../../../../src/port I
> think dependency is not captured rightly.
>
> Thanks and Regards
> Mithun C Y
> EnterpriseDB: http://www.enterprisedb.com

In response to

Browse pgsql-hackers by date

  From Date Subject
Next Message Pavel Stehule 2016-08-31 08:23:19 Re: Aggregate Push Down - Performing aggregation on foreign server
Previous Message Victor Wagner 2016-08-31 08:13:30 Re: Patch: Implement failover on libpq connect level.

Browse pgsql-jdbc by date

  From Date Subject
Next Message Dave Cramer 2016-09-02 12:18:34 Re: Anyone Getting deadlocks using 9.5
Previous Message Victor Wagner 2016-08-31 08:13:30 Re: Patch: Implement failover on libpq connect level.