[pgpool-committers: 991] pgpool: Fix do_query() not to hang when PostgreSQL returns an error.

[Tatsuo Ishii]

Fix do_query() not to hang when PostgreSQL returns an error.

The typical symptom is "I see SELECT is keep on running according to
pg_stat_activity".  To fix this pgpool-II just exits the process and
kill the existig connection.  This is not gentle but at this point I
believe this is the best solution. Here is an excerpt from source
code:
				/*
				 * This is fatal. Because: If we operate extended
				 * query, backend would not accept subsequent commands
				 * until "sync" message issued. However, if sync
				 * message issued, unnamed statement/unnamed portal
				 * will disappear and will cause lots of problems.  If
				 * we do not operate extended query, ongoing
				 * transaction is aborted, and subsequent query would
				 * not accepted.  In summary there's no transparent
				 * way for frontend to handle error case. The only way
				 * is closing this session.
				 */

Branch
------
master

Details
-------
http://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=e7a8350e6abf863371ca38758455eb5d3080614b

Modified Files
--------------
pool_process_query.c |   16 +++++++++++++++-
1 files changed, 15 insertions(+), 1 deletions(-)