FAQ addition when to rebuild nominatim.so

[nominatim.git] / nominatim / nominatim.py

diff --git a/nominatim/nominatim.py b/nominatim/nominatim.py
old mode 100644 (file)
new mode 100755 (executable)
index 49e2716..b29bf34
--- a/nominatim/nominatim.py
+++ b/nominatim/nominatim.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 #-----------------------------------------------------------------------------
 # nominatim - [description]
 #-----------------------------------------------------------------------------
@@ -35,9 +35,14 @@ import select
 log = logging.getLogger()
 
 def make_connection(options, asynchronous=False):
-    return psycopg2.connect(dbname=options.dbname, user=options.user,
-                            password=options.password, host=options.host,
-                            port=options.port, async_=asynchronous)
+    params = {'dbname' : options.dbname,
+              'user' : options.user,
+              'password' : options.password,
+              'host' : options.host,
+              'port' : options.port,
+              'async' : asynchronous}
+
+    return psycopg2.connect(**params)
 
 
 class RankRunner(object):
@@ -100,23 +105,52 @@ class InterpolationRunner(object):
 
 
 class DBConnection(object):
-    """ A signle non-blocking database connection.
+    """ A single non-blocking database connection.
     """
 
     def __init__(self, options):
+        self.current_query = None
+        self.current_params = None
+
+        self.conn = None
+        self.connect()
+
+    def connect(self):
+        if self.conn is not None:
+            self.cursor.close()
+            self.conn.close()
+
         self.conn = make_connection(options, asynchronous=True)
         self.wait()
 
         self.cursor = self.conn.cursor()
-
-        self.current_query = None
-        self.current_params = None
+        # Disable JIT and parallel workers as they are known to cause problems.
+        # Update pg_settings instead of using SET because it does not yield
+        # errors on older versions of Postgres where the settings are not
+        # implemented.
+        self.perform(
+            """ UPDATE pg_settings SET setting = -1 WHERE name = 'jit_above_cost';
+                UPDATE pg_settings SET setting = 0 
+                   WHERE name = 'max_parallel_workers_per_gather';""")
+        self.wait()
 
     def wait(self):
         """ Block until any pending operation is done.
         """
-        wait_select(self.conn)
-        self.current_query = None
+        while True:
+            try:
+                wait_select(self.conn)
+                self.current_query = None
+                return
+            except psycopg2.extensions.TransactionRollbackError as e:
+                if e.pgcode == '40P01':
+                    log.info("Deadlock detected (params = {}), retry."
+                              .format(self.current_params))
+                    self.cursor.execute(self.current_query, self.current_params)
+                else:
+                    raise
+            except psycopg2.errors.DeadlockDetected:
+                self.cursor.execute(self.current_query, self.current_params)
 
     def perform(self, sql, args=None):
         """ Send SQL query to the server. Returns immediately without
@@ -146,10 +180,12 @@ class DBConnection(object):
                 return True
         except psycopg2.extensions.TransactionRollbackError as e:
             if e.pgcode == '40P01':
-                log.info("Deadlock detected, retry.")
+                log.info("Deadlock detected (params = {}), retry.".format(self.current_params))
                 self.cursor.execute(self.current_query, self.current_params)
             else:
                 raise
+        except psycopg2.errors.DeadlockDetected:
+            self.cursor.execute(self.current_query, self.current_params)
 
         return False
 
@@ -167,7 +203,7 @@ class Indexer(object):
     def run(self):
         """ Run indexing over the entire database.
         """
-        log.info("Starting indexing rank ({} to {}) using {} threads".format(
+        log.warning("Starting indexing rank ({} to {}) using {} threads".format(
                  self.minrank, self.maxrank, len(self.threads)))
 
         for rank in range(self.minrank, self.maxrank):
@@ -175,13 +211,14 @@ class Indexer(object):
 
         if self.maxrank == 30:
             self.index(InterpolationRunner())
-            self.index(RankRunner(30))
+
+        self.index(RankRunner(self.maxrank))
 
     def index(self, obj):
         """ Index a single rank or table. `obj` describes the SQL to use
             for indexing.
         """
-        log.info("Starting {}".format(obj.name()))
+        log.warning("Starting {}".format(obj.name()))
 
         cur = self.conn.cursor(name='main')
         cur.execute(obj.sql_index_sectors())
@@ -201,7 +238,7 @@ class Indexer(object):
         index_sql = obj.sql_index_place()
         min_grouped_tuples = total_tuples - len(self.threads) * 1000
 
-        next_info = 100
+        next_info = 100 if log.isEnabledFor(logging.INFO) else total_tuples + 1
 
         for r in cur:
             sector = r[0]
@@ -228,7 +265,7 @@ class Indexer(object):
                     now = datetime.now()
                     done_time = (now - rank_start_time).total_seconds()
                     tuples_per_sec = done_tuples / done_time
-                    print("Done {} in {} @ {:.3f} per second - {} ETA (seconds): {:.2f}"
+                    log.info("Done {} in {} @ {:.3f} per second - {} ETA (seconds): {:.2f}"
                            .format(done_tuples, int(done_time),
                                    tuples_per_sec, obj.name(),
                                    (total_tuples - done_tuples)/tuples_per_sec))
@@ -247,7 +284,7 @@ class Indexer(object):
         rank_end_time = datetime.now()
         diff_seconds = (rank_end_time-rank_start_time).total_seconds()
 
-        log.info("Done {}/{} in {} @ {:.3f} per second - FINISHED {}\n".format(
+        log.warning("Done {}/{} in {} @ {:.3f} per second - FINISHED {}\n".format(
                  done_tuples, total_tuples, int(diff_seconds),
                  done_tuples/diff_seconds, obj.name()))
 
@@ -256,15 +293,27 @@ class Indexer(object):
             sending a query.
         """
         ready = self.threads
+        command_stat = 0
 
         while True:
             for thread in ready:
                 if thread.is_done():
+                    command_stat += 1
                     yield thread
 
-            ready, _, _ = select.select(self.threads, [], [])
+            # refresh the connections occasionaly to avoid potential
+            # memory leaks in Postgresql.
+            if command_stat > 100000:
+                for t in self.threads:
+                    while not t.is_done():
+                        t.wait()
+                    t.connect()
+                command_stat = 0
+                ready = self.threads
+            else:
+                ready, _, _ = select.select(self.threads, [], [])
 
-        assert(False, "Unreachable code")
+        assert False, "Unreachable code"
 
 
 def nominatim_arg_parser():