"""
Main work horse for indexing (computing addresses) the database.
"""
-# pylint: disable=C0111
import logging
import select
-import psycopg2
-
-from .progress import ProgressLogger
-from ..db.async_connection import DBConnection
+from nominatim.indexer.progress import ProgressLogger
+from nominatim.indexer import runners
+from nominatim.db.async_connection import DBConnection
+from nominatim.db.connection import connect
LOG = logging.getLogger()
-class RankRunner:
- """ Returns SQL commands for indexing one rank within the placex table.
+class WorkerPool:
+ """ A pool of asynchronous database connections.
+
+ The pool may be used as a context manager.
"""
+ REOPEN_CONNECTIONS_AFTER = 100000
- def __init__(self, rank):
- self.rank = rank
+ def __init__(self, dsn, pool_size):
+ self.threads = [DBConnection(dsn) for _ in range(pool_size)]
+ self.free_workers = self._yield_free_worker()
- def name(self):
- return "rank {}".format(self.rank)
- def sql_count_objects(self):
- return """SELECT count(*) FROM placex
- WHERE rank_address = {} and indexed_status > 0
- """.format(self.rank)
+ def finish_all(self):
+ """ Wait for all connection to finish.
+ """
+ for thread in self.threads:
+ while not thread.is_done():
+ thread.wait()
- def sql_get_objects(self):
- return """SELECT place_id FROM placex
- WHERE indexed_status > 0 and rank_address = {}
- ORDER BY geometry_sector""".format(self.rank)
+ self.free_workers = self._yield_free_worker()
- @staticmethod
- def sql_index_place(ids):
- return "UPDATE placex SET indexed_status = 0 WHERE place_id IN ({})"\
- .format(','.join((str(i) for i in ids)))
+ def close(self):
+ """ Close all connections and clear the pool.
+ """
+ for thread in self.threads:
+ thread.close()
+ self.threads = []
+ self.free_workers = None
-class InterpolationRunner:
- """ Returns SQL commands for indexing the address interpolation table
- location_property_osmline.
- """
+ def next_free_worker(self):
+ """ Get the next free connection.
+ """
+ return next(self.free_workers)
- @staticmethod
- def name():
- return "interpolation lines (location_property_osmline)"
-
- @staticmethod
- def sql_count_objects():
- return """SELECT count(*) FROM location_property_osmline
- WHERE indexed_status > 0"""
-
- @staticmethod
- def sql_get_objects():
- return """SELECT place_id FROM location_property_osmline
- WHERE indexed_status > 0
- ORDER BY geometry_sector"""
-
- @staticmethod
- def sql_index_place(ids):
- return """UPDATE location_property_osmline
- SET indexed_status = 0 WHERE place_id IN ({})"""\
- .format(','.join((str(i) for i in ids)))
-
-class BoundaryRunner:
- """ Returns SQL commands for indexing the administrative boundaries
- of a certain rank.
- """
- def __init__(self, rank):
- self.rank = rank
+ def _yield_free_worker(self):
+ ready = self.threads
+ command_stat = 0
+ while True:
+ for thread in ready:
+ if thread.is_done():
+ command_stat += 1
+ yield thread
+
+ if command_stat > self.REOPEN_CONNECTIONS_AFTER:
+ for thread in self.threads:
+ while not thread.is_done():
+ thread.wait()
+ thread.connect()
+ ready = self.threads
+ command_stat = 0
+ else:
+ _, ready, _ = select.select([], self.threads, [])
+
- def name(self):
- return "boundaries rank {}".format(self.rank)
+ def __enter__(self):
+ return self
- def sql_count_objects(self):
- return """SELECT count(*) FROM placex
- WHERE indexed_status > 0
- AND rank_search = {}
- AND class = 'boundary' and type = 'administrative'""".format(self.rank)
- def sql_get_objects(self):
- return """SELECT place_id FROM placex
- WHERE indexed_status > 0 and rank_search = {}
- and class = 'boundary' and type = 'administrative'
- ORDER BY partition, admin_level""".format(self.rank)
+ def __exit__(self, exc_type, exc_value, traceback):
+ self.close()
- @staticmethod
- def sql_index_place(ids):
- return "UPDATE placex SET indexed_status = 0 WHERE place_id IN ({})"\
- .format(','.join((str(i) for i in ids)))
class Indexer:
""" Main indexing routine.
"""
def __init__(self, dsn, num_threads):
- self.conn = psycopg2.connect(dsn)
- self.threads = [DBConnection(dsn) for _ in range(num_threads)]
+ self.dsn = dsn
+ self.num_threads = num_threads
+
+
+ def index_full(self, analyse=True):
+ """ Index the complete database. This will first index boudnaries
+ followed by all other objects. When `analyse` is True, then the
+ database will be analysed at the appropriate places to
+ ensure that database statistics are updated.
+ """
+ with connect(self.dsn) as conn:
+ conn.autocommit = True
+
+ if analyse:
+ def _analyze():
+ with conn.cursor() as cur:
+ cur.execute('ANALYZE')
+ else:
+ def _analyze():
+ pass
+
+ self.index_by_rank(0, 4)
+ _analyze()
+
+ self.index_boundaries(0, 30)
+ _analyze()
+
+ self.index_by_rank(5, 25)
+ _analyze()
+
+ self.index_by_rank(26, 30)
+ _analyze()
+
+ self.index_postcodes()
+ _analyze()
+
def index_boundaries(self, minrank, maxrank):
+ """ Index only administrative boundaries within the given rank range.
+ """
LOG.warning("Starting indexing boundaries using %s threads",
- len(self.threads))
+ self.num_threads)
- for rank in range(max(minrank, 5), min(maxrank, 26)):
- self.index(BoundaryRunner(rank))
+ for rank in range(max(minrank, 4), min(maxrank, 26)):
+ self._index(runners.BoundaryRunner(rank))
def index_by_rank(self, minrank, maxrank):
- """ Run classic indexing by rank.
+ """ Index all entries of placex in the given rank range (inclusive)
+ in order of their address rank.
+
+ When rank 30 is requested then also interpolations and
+ places with address rank 0 will be indexed.
"""
maxrank = min(maxrank, 30)
LOG.warning("Starting indexing rank (%i to %i) using %i threads",
- minrank, maxrank, len(self.threads))
+ minrank, maxrank, self.num_threads)
for rank in range(max(1, minrank), maxrank):
- self.index(RankRunner(rank))
+ self._index(runners.RankRunner(rank))
if maxrank == 30:
- self.index(RankRunner(0))
- self.index(InterpolationRunner(), 20)
- self.index(RankRunner(30), 20)
+ self._index(runners.RankRunner(0))
+ self._index(runners.InterpolationRunner(), 20)
+ self._index(runners.RankRunner(30), 20)
else:
- self.index(RankRunner(maxrank))
+ self._index(runners.RankRunner(maxrank))
+
+
+ def index_postcodes(self):
+ """Index the entries ofthe location_postcode table.
+ """
+ LOG.warning("Starting indexing postcodes using %s threads", self.num_threads)
+
+ self._index(runners.PostcodeRunner(), 20)
+
def update_status_table(self):
""" Update the status in the status table to 'indexed'.
"""
- with self.conn.cursor() as cur:
- cur.execute('UPDATE import_status SET indexed = true')
- self.conn.commit()
+ with connect(self.dsn) as conn:
+ with conn.cursor() as cur:
+ cur.execute('UPDATE import_status SET indexed = true')
- def index(self, obj, batch=1):
- """ Index a single rank or table. `obj` describes the SQL to use
+ conn.commit()
+
+ def _index(self, runner, batch=1):
+ """ Index a single rank or table. `runner` describes the SQL to use
for indexing. `batch` describes the number of objects that
should be processed with a single SQL statement
"""
- LOG.warning("Starting %s (using batch size %s)", obj.name(), batch)
-
- cur = self.conn.cursor()
- cur.execute(obj.sql_count_objects())
+ LOG.warning("Starting %s (using batch size %s)", runner.name(), batch)
- total_tuples = cur.fetchone()[0]
- LOG.debug("Total number of rows: %i", total_tuples)
+ with connect(self.dsn) as conn:
+ with conn.cursor() as cur:
+ total_tuples = cur.scalar(runner.sql_count_objects())
+ LOG.debug("Total number of rows: %i", total_tuples)
- cur.close()
+ conn.commit()
- progress = ProgressLogger(obj.name(), total_tuples)
+ progress = ProgressLogger(runner.name(), total_tuples)
- if total_tuples > 0:
- cur = self.conn.cursor(name='places')
- cur.execute(obj.sql_get_objects())
+ if total_tuples > 0:
+ with conn.cursor(name='places') as cur:
+ cur.execute(runner.sql_get_objects())
- next_thread = self.find_free_thread()
- while True:
- places = [p[0] for p in cur.fetchmany(batch)]
- if not places:
- break
+ with WorkerPool(self.dsn, self.num_threads) as pool:
+ while True:
+ places = [p[0] for p in cur.fetchmany(batch)]
+ if not places:
+ break
- LOG.debug("Processing places: %s", str(places))
- thread = next(next_thread)
+ LOG.debug("Processing places: %s", str(places))
+ worker = pool.next_free_worker()
- thread.perform(obj.sql_index_place(places))
- progress.add(len(places))
+ worker.perform(runner.sql_index_place(places))
+ progress.add(len(places))
- cur.close()
+ pool.finish_all()
- for thread in self.threads:
- thread.wait()
+ conn.commit()
progress.done()
-
- def find_free_thread(self):
- """ Generator that returns the next connection that is free for
- sending a query.
- """
- ready = self.threads
- command_stat = 0
-
- while True:
- for thread in ready:
- if thread.is_done():
- command_stat += 1
- yield thread
-
- # refresh the connections occasionaly to avoid potential
- # memory leaks in Postgresql.
- if command_stat > 100000:
- for thread in self.threads:
- while not thread.is_done():
- thread.wait()
- thread.connect()
- command_stat = 0
- ready = self.threads
- else:
- ready, _, _ = select.select(self.threads, [], [])
-
- assert False, "Unreachable code"
projects / nominatim.git / blobdiff