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cpython/Lib/bsddb/test/test_replication.py
R. David Murray 343facabf1 Issue 3892 again. The bsddb3 replication test still fails randomly. 
Since this module is unmaintained in the library and gone in py3k,
this patch skips the remainder of the replication test if a
second timeout occurs, as it randomly does.  This should improve buildbot
stability.
2010-03-01 19:14:16 +00:00

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"""TestCases for distributed transactions.
"""
import os
import time
import unittest
from test_all import db, test_support, have_threads, verbose, \
get_new_environment_path, get_new_database_path
#----------------------------------------------------------------------
class DBReplicationManager(unittest.TestCase):
import sys
if sys.version_info[:3] < (2, 4, 0):
def assertTrue(self, expr, msg=None):
self.failUnless(expr,msg=msg)
def setUp(self) :
self.homeDirMaster = get_new_environment_path()
self.homeDirClient = get_new_environment_path()
self.dbenvMaster = db.DBEnv()
self.dbenvClient = db.DBEnv()
# Must use "DB_THREAD" because the Replication Manager will
# be executed in other threads but will use the same environment.
# http://forums.oracle.com/forums/thread.jspa?threadID=645788&tstart=0
self.dbenvMaster.open(self.homeDirMaster, db.DB_CREATE | db.DB_INIT_TXN
| db.DB_INIT_LOG | db.DB_INIT_MPOOL | db.DB_INIT_LOCK |
db.DB_INIT_REP | db.DB_RECOVER | db.DB_THREAD, 0666)
self.dbenvClient.open(self.homeDirClient, db.DB_CREATE | db.DB_INIT_TXN
| db.DB_INIT_LOG | db.DB_INIT_MPOOL | db.DB_INIT_LOCK |
db.DB_INIT_REP | db.DB_RECOVER | db.DB_THREAD, 0666)
self.confirmed_master=self.client_startupdone=False
def confirmed_master(a,b,c) :
if b==db.DB_EVENT_REP_MASTER :
self.confirmed_master=True
def client_startupdone(a,b,c) :
if b==db.DB_EVENT_REP_STARTUPDONE :
self.client_startupdone=True
self.dbenvMaster.set_event_notify(confirmed_master)
self.dbenvClient.set_event_notify(client_startupdone)
#self.dbenvMaster.set_verbose(db.DB_VERB_REPLICATION, True)
#self.dbenvMaster.set_verbose(db.DB_VERB_FILEOPS_ALL, True)
#self.dbenvClient.set_verbose(db.DB_VERB_REPLICATION, True)
#self.dbenvClient.set_verbose(db.DB_VERB_FILEOPS_ALL, True)
self.dbMaster = self.dbClient = None
def tearDown(self):
if self.dbClient :
self.dbClient.close()
if self.dbMaster :
self.dbMaster.close()
self.dbenvClient.close()
self.dbenvMaster.close()
test_support.rmtree(self.homeDirClient)
test_support.rmtree(self.homeDirMaster)
def test01_basic_replication(self) :
master_port = test_support.find_unused_port()
self.dbenvMaster.repmgr_set_local_site("127.0.0.1", master_port)
client_port = test_support.find_unused_port()
self.dbenvClient.repmgr_set_local_site("127.0.0.1", client_port)
self.dbenvMaster.repmgr_add_remote_site("127.0.0.1", client_port)
self.dbenvClient.repmgr_add_remote_site("127.0.0.1", master_port)
self.dbenvMaster.rep_set_nsites(2)
self.dbenvClient.rep_set_nsites(2)
self.dbenvMaster.rep_set_priority(10)
self.dbenvClient.rep_set_priority(0)
self.dbenvMaster.rep_set_timeout(db.DB_REP_CONNECTION_RETRY,100123)
self.dbenvClient.rep_set_timeout(db.DB_REP_CONNECTION_RETRY,100321)
self.assertEquals(self.dbenvMaster.rep_get_timeout(
db.DB_REP_CONNECTION_RETRY), 100123)
self.assertEquals(self.dbenvClient.rep_get_timeout(
db.DB_REP_CONNECTION_RETRY), 100321)
self.dbenvMaster.rep_set_timeout(db.DB_REP_ELECTION_TIMEOUT, 100234)
self.dbenvClient.rep_set_timeout(db.DB_REP_ELECTION_TIMEOUT, 100432)
self.assertEquals(self.dbenvMaster.rep_get_timeout(
db.DB_REP_ELECTION_TIMEOUT), 100234)
self.assertEquals(self.dbenvClient.rep_get_timeout(
db.DB_REP_ELECTION_TIMEOUT), 100432)
self.dbenvMaster.rep_set_timeout(db.DB_REP_ELECTION_RETRY, 100345)
self.dbenvClient.rep_set_timeout(db.DB_REP_ELECTION_RETRY, 100543)
self.assertEquals(self.dbenvMaster.rep_get_timeout(
db.DB_REP_ELECTION_RETRY), 100345)
self.assertEquals(self.dbenvClient.rep_get_timeout(
db.DB_REP_ELECTION_RETRY), 100543)
self.dbenvMaster.repmgr_set_ack_policy(db.DB_REPMGR_ACKS_ALL)
self.dbenvClient.repmgr_set_ack_policy(db.DB_REPMGR_ACKS_ALL)
self.dbenvMaster.repmgr_start(1, db.DB_REP_MASTER);
self.dbenvClient.repmgr_start(1, db.DB_REP_CLIENT);
self.assertEquals(self.dbenvMaster.rep_get_nsites(),2)
self.assertEquals(self.dbenvClient.rep_get_nsites(),2)
self.assertEquals(self.dbenvMaster.rep_get_priority(),10)
self.assertEquals(self.dbenvClient.rep_get_priority(),0)
self.assertEquals(self.dbenvMaster.repmgr_get_ack_policy(),
db.DB_REPMGR_ACKS_ALL)
self.assertEquals(self.dbenvClient.repmgr_get_ack_policy(),
db.DB_REPMGR_ACKS_ALL)
# The timeout is necessary in BDB 4.5, since DB_EVENT_REP_STARTUPDONE
# is not generated if the master has no new transactions.
# This is solved in BDB 4.6 (#15542).
import time
timeout = time.time()+60
while (time.time()<timeout) and not (self.confirmed_master and self.client_startupdone) :
time.sleep(0.02)
# self.client_startupdone does not always get set to True within
# the timeout. On windows this may be a deep issue, on other
# platforms it is likely just a timing issue, especially on slow
# virthost buildbots (see issue 3892 for more). Even though
# the timeout triggers, the rest of this test method usually passes
# (but not all of it always, see below). So we just note the
# timeout on stderr and keep soldering on.
if time.time()>timeout:
import sys
print >> sys.stderr, ("XXX: timeout happened before"
"startup was confirmed - see issue 3892")
startup_timeout = True
d = self.dbenvMaster.repmgr_site_list()
self.assertEquals(len(d), 1)
self.assertEquals(d[0][0], "127.0.0.1")
self.assertEquals(d[0][1], client_port)
self.assertTrue((d[0][2]==db.DB_REPMGR_CONNECTED) or \
(d[0][2]==db.DB_REPMGR_DISCONNECTED))
d = self.dbenvClient.repmgr_site_list()
self.assertEquals(len(d), 1)
self.assertEquals(d[0][0], "127.0.0.1")
self.assertEquals(d[0][1], master_port)
self.assertTrue((d[0][2]==db.DB_REPMGR_CONNECTED) or \
(d[0][2]==db.DB_REPMGR_DISCONNECTED))
if db.version() >= (4,6) :
d = self.dbenvMaster.repmgr_stat(flags=db.DB_STAT_CLEAR);
self.assertTrue("msgs_queued" in d)
self.dbMaster=db.DB(self.dbenvMaster)
txn=self.dbenvMaster.txn_begin()
self.dbMaster.open("test", db.DB_HASH, db.DB_CREATE, 0666, txn=txn)
txn.commit()
import time,os.path
timeout=time.time()+10
while (time.time()<timeout) and \
not (os.path.exists(os.path.join(self.homeDirClient,"test"))) :
time.sleep(0.01)
self.dbClient=db.DB(self.dbenvClient)
while True :
txn=self.dbenvClient.txn_begin()
try :
self.dbClient.open("test", db.DB_HASH, flags=db.DB_RDONLY,
mode=0666, txn=txn)
except db.DBRepHandleDeadError :
txn.abort()
self.dbClient.close()
self.dbClient=db.DB(self.dbenvClient)
continue
txn.commit()
break
txn=self.dbenvMaster.txn_begin()
self.dbMaster.put("ABC", "123", txn=txn)
txn.commit()
import time
timeout=time.time()+10
v=None
while (time.time()<timeout) and (v is None) :
txn=self.dbenvClient.txn_begin()
v=self.dbClient.get("ABC", txn=txn)
txn.commit()
if v is None :
time.sleep(0.02)
# If startup did not happen before the timeout above, then this test
# sometimes fails. This happens randomly, which causes buildbot
# instability, but all the other bsddb tests pass. Since bsddb3 in the
# stdlib is currently not getting active maintenance, and is gone in
# py3k, we just skip the end of the test in that case.
if time.time()>=timeout and startup_timeout:
self.skipTest("replication test skipped due to random failure, "
"see issue 3892")
self.assertTrue(time.time()<timeout)
self.assertEquals("123", v)
txn=self.dbenvMaster.txn_begin()
self.dbMaster.delete("ABC", txn=txn)
txn.commit()
timeout=time.time()+10
while (time.time()<timeout) and (v is not None) :
txn=self.dbenvClient.txn_begin()
v=self.dbClient.get("ABC", txn=txn)
txn.commit()
if v is None :
time.sleep(0.02)
self.assertTrue(time.time()<timeout)
self.assertEquals(None, v)
class DBBaseReplication(DBReplicationManager):
def setUp(self) :
DBReplicationManager.setUp(self)
def confirmed_master(a,b,c) :
if (b == db.DB_EVENT_REP_MASTER) or (b == db.DB_EVENT_REP_ELECTED) :
self.confirmed_master = True
def client_startupdone(a,b,c) :
if b == db.DB_EVENT_REP_STARTUPDONE :
self.client_startupdone = True
self.dbenvMaster.set_event_notify(confirmed_master)
self.dbenvClient.set_event_notify(client_startupdone)
import Queue
self.m2c = Queue.Queue()
self.c2m = Queue.Queue()
# There are only two nodes, so we don't need to
# do any routing decision
def m2c(dbenv, control, rec, lsnp, envid, flags) :
self.m2c.put((control, rec))
def c2m(dbenv, control, rec, lsnp, envid, flags) :
self.c2m.put((control, rec))
self.dbenvMaster.rep_set_transport(13,m2c)
self.dbenvMaster.rep_set_priority(10)
self.dbenvClient.rep_set_transport(3,c2m)
self.dbenvClient.rep_set_priority(0)
self.assertEquals(self.dbenvMaster.rep_get_priority(),10)
self.assertEquals(self.dbenvClient.rep_get_priority(),0)
#self.dbenvMaster.set_verbose(db.DB_VERB_REPLICATION, True)
#self.dbenvMaster.set_verbose(db.DB_VERB_FILEOPS_ALL, True)
#self.dbenvClient.set_verbose(db.DB_VERB_REPLICATION, True)
#self.dbenvClient.set_verbose(db.DB_VERB_FILEOPS_ALL, True)
def thread_master() :
return self.thread_do(self.dbenvMaster, self.c2m, 3,
self.master_doing_election, True)
def thread_client() :
return self.thread_do(self.dbenvClient, self.m2c, 13,
self.client_doing_election, False)
from threading import Thread
t_m=Thread(target=thread_master)
t_c=Thread(target=thread_client)
import sys
if sys.version_info[0] < 3 :
t_m.setDaemon(True)
t_c.setDaemon(True)
else :
t_m.daemon = True
t_c.daemon = True
self.t_m = t_m
self.t_c = t_c
self.dbMaster = self.dbClient = None
self.master_doing_election=[False]
self.client_doing_election=[False]
def tearDown(self):
if self.dbClient :
self.dbClient.close()
if self.dbMaster :
self.dbMaster.close()
self.m2c.put(None)
self.c2m.put(None)
self.t_m.join()
self.t_c.join()
self.dbenvClient.close()
self.dbenvMaster.close()
test_support.rmtree(self.homeDirClient)
test_support.rmtree(self.homeDirMaster)
def basic_rep_threading(self) :
self.dbenvMaster.rep_start(flags=db.DB_REP_MASTER)
self.dbenvClient.rep_start(flags=db.DB_REP_CLIENT)
def thread_do(env, q, envid, election_status, must_be_master) :
while True :
v=q.get()
if v is None : return
env.rep_process_message(v[0], v[1], envid)
self.thread_do = thread_do
self.t_m.start()
self.t_c.start()
def test01_basic_replication(self) :
self.basic_rep_threading()
# The timeout is necessary in BDB 4.5, since DB_EVENT_REP_STARTUPDONE
# is not generated if the master has no new transactions.
# This is solved in BDB 4.6 (#15542).
import time
timeout = time.time()+60
while (time.time()<timeout) and not (self.confirmed_master and
self.client_startupdone) :
time.sleep(0.02)
self.assertTrue(time.time()<timeout)
self.dbMaster=db.DB(self.dbenvMaster)
txn=self.dbenvMaster.txn_begin()
self.dbMaster.open("test", db.DB_HASH, db.DB_CREATE, 0666, txn=txn)
txn.commit()
import time,os.path
timeout=time.time()+10
while (time.time()<timeout) and \
not (os.path.exists(os.path.join(self.homeDirClient,"test"))) :
time.sleep(0.01)
self.dbClient=db.DB(self.dbenvClient)
while True :
txn=self.dbenvClient.txn_begin()
try :
self.dbClient.open("test", db.DB_HASH, flags=db.DB_RDONLY,
mode=0666, txn=txn)
except db.DBRepHandleDeadError :
txn.abort()
self.dbClient.close()
self.dbClient=db.DB(self.dbenvClient)
continue
txn.commit()
break
txn=self.dbenvMaster.txn_begin()
self.dbMaster.put("ABC", "123", txn=txn)
txn.commit()
import time
timeout=time.time()+10
v=None
while (time.time()<timeout) and (v is None) :
txn=self.dbenvClient.txn_begin()
v=self.dbClient.get("ABC", txn=txn)
txn.commit()
if v is None :
time.sleep(0.02)
self.assertTrue(time.time()<timeout)
self.assertEquals("123", v)
txn=self.dbenvMaster.txn_begin()
self.dbMaster.delete("ABC", txn=txn)
txn.commit()
timeout=time.time()+10
while (time.time()<timeout) and (v is not None) :
txn=self.dbenvClient.txn_begin()
v=self.dbClient.get("ABC", txn=txn)
txn.commit()
if v is None :
time.sleep(0.02)
self.assertTrue(time.time()<timeout)
self.assertEquals(None, v)
if db.version() >= (4,7) :
def test02_test_request(self) :
self.basic_rep_threading()
(minimum, maximum) = self.dbenvClient.rep_get_request()
self.dbenvClient.rep_set_request(minimum-1, maximum+1)
self.assertEqual(self.dbenvClient.rep_get_request(),
(minimum-1, maximum+1))
if db.version() >= (4,6) :
def test03_master_election(self) :
# Get ready to hold an election
#self.dbenvMaster.rep_start(flags=db.DB_REP_MASTER)
self.dbenvMaster.rep_start(flags=db.DB_REP_CLIENT)
self.dbenvClient.rep_start(flags=db.DB_REP_CLIENT)
def thread_do(env, q, envid, election_status, must_be_master) :
while True :
v=q.get()
if v is None : return
r = env.rep_process_message(v[0],v[1],envid)
if must_be_master and self.confirmed_master :
self.dbenvMaster.rep_start(flags = db.DB_REP_MASTER)
must_be_master = False
if r[0] == db.DB_REP_HOLDELECTION :
def elect() :
while True :
try :
env.rep_elect(2, 1)
election_status[0] = False
break
except db.DBRepUnavailError :
pass
if not election_status[0] and not self.confirmed_master :
from threading import Thread
election_status[0] = True
t=Thread(target=elect)
import sys
if sys.version_info[0] < 3 :
t.setDaemon(True)
else :
t.daemon = True
t.start()
self.thread_do = thread_do
self.t_m.start()
self.t_c.start()
self.dbenvMaster.rep_set_timeout(db.DB_REP_ELECTION_TIMEOUT, 50000)
self.dbenvClient.rep_set_timeout(db.DB_REP_ELECTION_TIMEOUT, 50000)
self.client_doing_election[0] = True
while True :
try :
self.dbenvClient.rep_elect(2, 1)
self.client_doing_election[0] = False
break
except db.DBRepUnavailError :
pass
self.assertTrue(self.confirmed_master)
#----------------------------------------------------------------------
def test_suite():
suite = unittest.TestSuite()
if db.version() >= (4, 6) :
dbenv = db.DBEnv()
try :
dbenv.repmgr_get_ack_policy()
ReplicationManager_available=True
except :
ReplicationManager_available=False
dbenv.close()
del dbenv
if ReplicationManager_available :
suite.addTest(unittest.makeSuite(DBReplicationManager))
if have_threads :
suite.addTest(unittest.makeSuite(DBBaseReplication))
return suite
if __name__ == '__main__':
unittest.main(defaultTest='test_suite')
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