From c9838a02ce839d0651d2ccb903681864dd78e67e Mon Sep 17 00:00:00 2001
From: Sarah Hoffmann <lonvia@denofr.de>
Date: Tue, 16 Feb 2021 15:05:14 +0100
Subject: [PATCH] disable JIT and parallel execution for osm2pgsql updates
 again

The gazetteer output doesn't disable these functions when
writing to the place table but the triggers may contain
operations that cause misplanning for the query planner.
---
 nominatim/db/connection.py     | 9 +++++++++
 nominatim/tools/exec_utils.py  | 3 +++
 nominatim/tools/replication.py | 1 +
 3 files changed, 13 insertions(+)

diff --git a/nominatim/db/connection.py b/nominatim/db/connection.py
index 4d30151d..c7e22c98 100644
--- a/nominatim/db/connection.py
+++ b/nominatim/db/connection.py
@@ -50,6 +50,15 @@ class _Connection(psycopg2.extensions.connection):
                                 WHERE tablename = %s""", (table, ))
             return num == 1
 
+    def server_version_tuple(self):
+        """ Return the server version as a tuple of (major, minor).
+            Converts correctly for pre-10 and post-10 PostgreSQL versions.
+        """
+        version = self.server_version
+        if version < 100000:
+            return (version / 10000, (version % 10000) / 100)
+
+        return (version / 10000, version % 10000)
 
 def connect(dsn):
     """ Open a connection to the database using the specialised connection
diff --git a/nominatim/tools/exec_utils.py b/nominatim/tools/exec_utils.py
index 541a2b08..f373f347 100644
--- a/nominatim/tools/exec_utils.py
+++ b/nominatim/tools/exec_utils.py
@@ -127,6 +127,9 @@ def run_osm2pgsql(options):
         if param in dsn:
             cmd.extend(('--' + param, dsn[param]))
 
+    if options.get('disable_jit', False):
+        env['PGOPTIONS'] = '-c jit=off -c max_parallel_workers_per_gather=0'
+
     cmd.append(str(options['import_file']))
 
     subprocess.run(cmd, cwd=options.get('cwd', '.'), env=env, check=True)
diff --git a/nominatim/tools/replication.py b/nominatim/tools/replication.py
index a3ef84fe..a0a741e8 100644
--- a/nominatim/tools/replication.py
+++ b/nominatim/tools/replication.py
@@ -115,6 +115,7 @@ def update(conn, options):
 
     # Consume updates with osm2pgsql.
     options['append'] = True
+    options['disable_jit'] = conn.server_version_tuple() >= (11, 0)
     run_osm2pgsql(options)
 
     # Write the current status to the file
-- 
2.39.5