def test_secondary_connection(self):
self.c = ReplicaSetConnection(
self.seed, replicaSet=self.name, use_greenlets=use_greenlets)
self.assertTrue(bool(len(self.c.secondaries)))
db = self.c.pymongo_test
db.test.remove({}, safe=True, w=len(self.c.secondaries))
# Force replication...
w = len(self.c.secondaries) + 1
db.test.insert({'foo': 'bar'}, safe=True, w=w)
# Test direct connection to a primary or secondary
primary_host, primary_port = replset_tools.get_primary().split(':')
primary_port = int(primary_port)
secondary_host, secondary_port = replset_tools.get_secondaries()[0].split(':')
secondary_port = int(secondary_port)
self.assertTrue(Connection(
primary_host, primary_port, use_greenlets=use_greenlets).is_primary)
self.assertTrue(Connection(
primary_host, primary_port, use_greenlets=use_greenlets,
read_preference=ReadPreference.PRIMARY_PREFERRED).is_primary)
self.assertTrue(Connection(
primary_host, primary_port, use_greenlets=use_greenlets,
read_preference=ReadPreference.SECONDARY_PREFERRED).is_primary)
self.assertTrue(Connection(
primary_host, primary_port, use_greenlets=use_greenlets,
read_preference=ReadPreference.NEAREST).is_primary)
self.assertTrue(Connection(
primary_host, primary_port, use_greenlets=use_greenlets,
read_preference=ReadPreference.SECONDARY).is_primary)
for kwargs in [
{'read_preference': ReadPreference.PRIMARY_PREFERRED},
{'read_preference': ReadPreference.SECONDARY},
{'read_preference': ReadPreference.SECONDARY_PREFERRED},
{'read_preference': ReadPreference.NEAREST},
{'slave_okay': True},
]:
conn = Connection(
secondary_host, secondary_port, use_greenlets=use_greenlets, **kwargs)
self.assertEqual(secondary_host, conn.host)
self.assertEqual(secondary_port, conn.port)
self.assertFalse(conn.is_primary)
self.assert_(conn.pymongo_test.test.find_one())
# Test direct connection to an arbiter
secondary_host = replset_tools.get_arbiters()[0]
host, port = replset_tools.arbiters()[0].split(':')
port = int(port)
conn = Connection(host, port)
self.assertEqual(host, conn.host)
self.assertEqual(port, conn.port)
def setUp(self):
members = [
# primary
{'tags': {'dc': 'ny', 'name': 'primary'}},
# secondary
{'tags': {'dc': 'la', 'name': 'secondary'}, 'priority': 0},
# other_secondary
{'tags': {'dc': 'ny', 'name': 'other_secondary'}, 'priority': 0},
]
res = replset_tools.start_replica_set(members)
self.seed, self.name = res
primary = replset_tools.get_primary()
self.primary = _partition_node(primary)
self.primary_tags = replset_tools.get_tags(primary)
# Make sure priority worked
self.assertEqual('primary', self.primary_tags['name'])
self.primary_dc = {'dc': self.primary_tags['dc']}
secondaries = replset_tools.get_secondaries()
(secondary, ) = [
s for s in secondaries
if replset_tools.get_tags(s)['name'] == 'secondary']
self.secondary = _partition_node(secondary)
self.secondary_tags = replset_tools.get_tags(secondary)
self.secondary_dc = {'dc': self.secondary_tags['dc']}
(other_secondary, ) = [
s for s in secondaries
if replset_tools.get_tags(s)['name'] == 'other_secondary']
self.other_secondary = _partition_node(other_secondary)
self.other_secondary_tags = replset_tools.get_tags(other_secondary)
self.other_secondary_dc = {'dc': self.other_secondary_tags['dc']}
self.c = ReplicaSetConnection(
self.seed, replicaSet=self.name, use_greenlets=use_greenlets)
self.db = self.c.pymongo_test
self.w = len(self.c.secondaries) + 1
self.db.test.remove({}, safe=True, w=self.w)
self.db.test.insert(
[{'foo': i} for i in xrange(10)], safe=True, w=self.w)
self.clear_ping_times()
def test_read_preference(self):
# This is long, but we put all the tests in one function to save time
# on setUp, which takes about 30 seconds to bring up a replica set.
# We pass through four states:
#
# 1. A primary and two secondaries
# 2. Primary down
# 3. Primary up, one secondary down
# 4. Primary up, all secondaries down
#
# For each state, we verify the behavior of PRIMARY,
# PRIMARY_PREFERRED, SECONDARY, SECONDARY_PREFERRED, and NEAREST
c = ReplicaSetConnection(
self.seed, replicaSet=self.name, use_greenlets=use_greenlets,
auto_start_request=False)
def assertReadFrom(member, *args, **kwargs):
utils.assertReadFrom(self, c, member, *args, **kwargs)
def assertReadFromAll(members, *args, **kwargs):
utils.assertReadFromAll(self, c, members, *args, **kwargs)
def unpartition_node(node):
host, port = node
return '%s:%s' % (host, port)
# To make the code terser, copy modes and hosts into local scope
PRIMARY = ReadPreference.PRIMARY
PRIMARY_PREFERRED = ReadPreference.PRIMARY_PREFERRED
SECONDARY = ReadPreference.SECONDARY
SECONDARY_PREFERRED = ReadPreference.SECONDARY_PREFERRED
NEAREST = ReadPreference.NEAREST
primary = self.primary
secondary = self.secondary
other_secondary = self.other_secondary
bad_tag = {'bad': 'tag'}
# 1. THREE MEMBERS UP -------------------------------------------------
# PRIMARY
assertReadFrom(primary, PRIMARY)
# PRIMARY_PREFERRED
# Trivial: mode and tags both match
assertReadFrom(primary, PRIMARY_PREFERRED, self.primary_dc)
# Secondary matches but not primary, choose primary
assertReadFrom(primary, PRIMARY_PREFERRED, self.secondary_dc)
# Chooses primary, ignoring tag sets
assertReadFrom(primary, PRIMARY_PREFERRED, self.primary_dc)
# Chooses primary, ignoring tag sets
assertReadFrom(primary, PRIMARY_PREFERRED, bad_tag)
assertReadFrom(primary, PRIMARY_PREFERRED, [bad_tag, {}])
# SECONDARY
assertReadFromAll([secondary, other_secondary], SECONDARY)
# SECONDARY_PREFERRED
assertReadFromAll([secondary, other_secondary], SECONDARY_PREFERRED)
# Multiple tags
assertReadFrom(secondary, SECONDARY_PREFERRED, self.secondary_tags)
# Fall back to primary if it's the only one matching the tags
assertReadFrom(primary, SECONDARY_PREFERRED, {'name': 'primary'})
# No matching secondaries
assertReadFrom(primary, SECONDARY_PREFERRED, bad_tag)
# Fall back from non-matching tag set to matching set
assertReadFromAll([secondary, other_secondary],
SECONDARY_PREFERRED, [bad_tag, {}])
assertReadFrom(other_secondary,
SECONDARY_PREFERRED, [bad_tag, {'dc': 'ny'}])
# NEAREST
self.clear_ping_times()
assertReadFromAll([primary, secondary, other_secondary], NEAREST)
assertReadFromAll([primary, other_secondary],
NEAREST, [bad_tag, {'dc': 'ny'}])
self.set_ping_time(primary, 0)
self.set_ping_time(secondary, .03) # 30 ms
self.set_ping_time(other_secondary, 10)
# Nearest member, no tags
assertReadFrom(primary, NEAREST)
# Tags override nearness
assertReadFrom(primary, NEAREST, {'name': 'primary'})
assertReadFrom(secondary, NEAREST, self.secondary_dc)
# Make secondary fast
self.set_ping_time(primary, .03) # 30 ms
self.set_ping_time(secondary, 0)
assertReadFrom(secondary, NEAREST)
# Other secondary fast
self.set_ping_time(secondary, 10)
self.set_ping_time(other_secondary, 0)
assertReadFrom(other_secondary, NEAREST)
# High secondaryAcceptableLatencyMS, should read from all members
assertReadFromAll(
[primary, secondary, other_secondary],
NEAREST, secondary_acceptable_latency_ms=1000*1000)
self.clear_ping_times()
assertReadFromAll([primary, other_secondary], NEAREST, [{'dc': 'ny'}])
# 2. PRIMARY DOWN -----------------------------------------------------
killed = replset_tools.kill_primary()
# Let monitor notice primary's gone
sleep(2 * MONITOR_INTERVAL)
# PRIMARY
assertReadFrom(None, PRIMARY)
# PRIMARY_PREFERRED
# No primary, choose matching secondary
assertReadFromAll([secondary, other_secondary], PRIMARY_PREFERRED)
assertReadFrom(secondary, PRIMARY_PREFERRED, {'name': 'secondary'})
# No primary or matching secondary
assertReadFrom(None, PRIMARY_PREFERRED, bad_tag)
# SECONDARY
assertReadFromAll([secondary, other_secondary], SECONDARY)
# Only primary matches
assertReadFrom(None, SECONDARY, {'name': 'primary'})
# No matching secondaries
assertReadFrom(None, SECONDARY, bad_tag)
# SECONDARY_PREFERRED
assertReadFromAll([secondary, other_secondary], SECONDARY_PREFERRED)
# Mode and tags both match
assertReadFrom(secondary, SECONDARY_PREFERRED, {'name': 'secondary'})
# NEAREST
self.clear_ping_times()
assertReadFromAll([secondary, other_secondary], NEAREST)
# 3. PRIMARY UP, ONE SECONDARY DOWN -----------------------------------
replset_tools.restart_members([killed])
for _ in range(30):
if replset_tools.get_primary():
break
sleep(1)
else:
self.fail("Primary didn't come back up")
replset_tools.kill_members([unpartition_node(secondary)], 2)
self.assertTrue(Connection(
unpartition_node(primary), use_greenlets=use_greenlets,
slave_okay=True
).admin.command('ismaster')['ismaster'])
sleep(2 * MONITOR_INTERVAL)
# PRIMARY
assertReadFrom(primary, PRIMARY)
# PRIMARY_PREFERRED
assertReadFrom(primary, PRIMARY_PREFERRED)
# SECONDARY
assertReadFrom(other_secondary, SECONDARY)
assertReadFrom(other_secondary, SECONDARY, self.other_secondary_dc)
# Only the down secondary matches
assertReadFrom(None, SECONDARY, {'name': 'secondary'})
# SECONDARY_PREFERRED
assertReadFrom(other_secondary, SECONDARY_PREFERRED)
assertReadFrom(
other_secondary, SECONDARY_PREFERRED, self.other_secondary_dc)
# The secondary matching the tag is down, use primary
assertReadFrom(primary, SECONDARY_PREFERRED, {'name': 'secondary'})
# NEAREST
assertReadFromAll([primary, other_secondary], NEAREST)
assertReadFrom(other_secondary, NEAREST, {'name': 'other_secondary'})
assertReadFrom(primary, NEAREST, {'name': 'primary'})
# 4. PRIMARY UP, ALL SECONDARIES DOWN ---------------------------------
replset_tools.kill_members([unpartition_node(other_secondary)], 2)
self.assertTrue(Connection(
unpartition_node(primary), use_greenlets=use_greenlets,
slave_okay=True
).admin.command('ismaster')['ismaster'])
# PRIMARY
assertReadFrom(primary, PRIMARY)
# PRIMARY_PREFERRED
assertReadFrom(primary, PRIMARY_PREFERRED)
assertReadFrom(primary, PRIMARY_PREFERRED, self.secondary_dc)
# SECONDARY
assertReadFrom(None, SECONDARY)
assertReadFrom(None, SECONDARY, self.other_secondary_dc)
assertReadFrom(None, SECONDARY, {'dc': 'ny'})
# SECONDARY_PREFERRED
assertReadFrom(primary, SECONDARY_PREFERRED)
assertReadFrom(primary, SECONDARY_PREFERRED, self.secondary_dc)
assertReadFrom(primary, SECONDARY_PREFERRED, {'name': 'secondary'})
assertReadFrom(primary, SECONDARY_PREFERRED, {'dc': 'ny'})
# NEAREST
assertReadFrom(primary, NEAREST)
assertReadFrom(None, NEAREST, self.secondary_dc)
assertReadFrom(None, NEAREST, {'name': 'secondary'})
# Even if primary's slow, still read from it
self.set_ping_time(primary, 100)
assertReadFrom(primary, NEAREST)
assertReadFrom(None, NEAREST, self.secondary_dc)
self.clear_ping_times()
