[jira] [Updated] (HAWQ-982) PL/Python with psycopg2 cannot connect to remote postgres

["Lei Chang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HAWQ-982?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lei Chang updated HAWQ-982:
---------------------------
    Assignee: Ruilong Huo  (was: Lei Chang)

> PL/Python with psycopg2 cannot connect to remote postgres
> ---------------------------------------------------------
>
>                 Key: HAWQ-982
>                 URL: https://issues.apache.org/jira/browse/HAWQ-982
>             Project: Apache HAWQ
>          Issue Type: Bug
>          Components: Core
>            Reporter: Lei Chang
>            Assignee: Ruilong Huo
>             Fix For: backlog
>
>
> For one use case I want to connect to external postgreSQL database from HAWQ PL/Python procedure.
> I use python psycopg2 library.
> Remote postgreSQL server reject connecion from HAWQ  with 
> this error :  FATAL  unsupported frontend protocol 28675.0: server supports 1.0 to 3.0.
> The same python code is running well from OS level.
> I wonder if  it is  HAWQ or PostgreSQL PL/Python interpreter related issiue.
> Any help or pointers would be great.
> -----------------------
> my code below:
> CREATE OR REPLACE FUNCTION dchoma.connection_test( ) RETURNS text AS
> $$
> import psycopg2
> try:
>     conn = psycopg2.connect("dbname='database_name' user='user' host='remote_host' password='pass' port=5432")
>     return "Connection successful "
> except Exception , msg :
>     return "Exception: {m}".format(m=msg)
> $$
> LANGUAGE 'plpythonu' VOLATILE;
> select * from dchoma.connection_test();
> HAWQ version 2.0.1.0 build dev ( compiled from github)
> Remote database version:  PostgreSQL 9.2.15 on x86_64-redhat-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-4), 64-bit
> OS: CentOS 7-1511
> i found similar issiue here, but the problem is not solved.
> https://discuss.zendesk.com/hc/en-us/community/posts/200793368-greenplum-dblink-postgresql-remote-is-error



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