Commit d14040ac authored by Kirill Smelkov's avatar Kirill Smelkov

Sync with NEO/py v1.12-13-gf2ea4be2 (oldproto branch)

* origin/old-proto:
  qa: skip broken ZODB test
  client: fix race with invalidations when starting a new transaction on ZODB 5
  Code clean-up, comment fixes
  master: fix crash in STARTING_BACKUP when connecting to an upstream secondary master
  mysql: workaround for MDEV-20693
  client: inline Application._loadFromCache
  client: replace global load lock by a per-oid one
  client: unindent code
  client: remove load lock in tpc_finish
  qa: check cache in testExternalInvalidation
  qa: comment testExternalInvalidation2
parents 8ea85c71 f2ea4be2
......@@ -17,7 +17,7 @@
import heapq
import random
import time
from collections import defaultdict
try:
from ZODB._compat import dumps, loads, _protocol
except ImportError:
......@@ -79,7 +79,7 @@ class Application(ThreadedApplication):
# no self-assigned NID, primary master will supply us one
self._cache = ClientCache() if cache_size is None else \
ClientCache(max_size=cache_size)
self._loading_oid = None
self._loading = defaultdict(lambda: (Lock(), []))
self.new_oid_list = ()
self.last_oid = '\0' * 8
self.storage_event_handler = storage.StorageEventHandler(self)
......@@ -90,19 +90,13 @@ class Application(ThreadedApplication):
self.notifications_handler = master.PrimaryNotificationsHandler( self)
self._txn_container = TransactionContainer()
# Lock definition :
# _load_lock is used to make loading and storing atomic
lock = Lock()
self._load_lock_acquire = lock.acquire
self._load_lock_release = lock.release
# _oid_lock is used in order to not call multiple oid
# generation at the same time
lock = Lock()
self._oid_lock_acquire = lock.acquire
self._oid_lock_release = lock.release
lock = Lock()
# _cache_lock is used for the client cache
self._cache_lock_acquire = lock.acquire
self._cache_lock_release = lock.release
self._cache_lock = Lock()
# _connecting_to_master_node is used to prevent simultaneous master
# node connection attempts
self._connecting_to_master_node = Lock()
......@@ -397,21 +391,32 @@ class Application(ThreadedApplication):
"""
# TODO:
# - rename parameters (here? and in handlers & packet definitions)
acquire = self._cache_lock_acquire
release = self._cache_lock_release
# XXX: Consider using a more fine-grained lock.
self._load_lock_acquire()
acquired = False
lock = self._cache_lock
try:
acquire()
try:
result = self._loadFromCache(oid, tid, before_tid)
if result:
return result
self._loading_oid = oid
self._loading_invalidated = []
finally:
release()
while 1:
with lock:
if tid:
result = self._cache.load(oid, tid + '*')
assert not result or result[1] == tid
else:
result = self._cache.load(oid, before_tid)
if result:
return result
load_lock = self._loading[oid][0]
acquired = load_lock.acquire(0)
# Several concurrent cache misses for the same oid are probably
# for the same tid so we use a per-oid lock to avoid asking the
# same data to the storage node.
if acquired:
# The first thread does load from storage,
# and fills cache with the response.
break
# The other threads wait for the first one to complete and
# loop, possibly resulting in a new cache miss if a different
# tid is actually wanted or if the data was too big.
with load_lock:
pass
# While the cache lock is released, an arbitrary number of
# invalidations may be processed, for this oid or not. And at this
# precise moment, if both tid and before_tid are None (which is
......@@ -427,20 +432,24 @@ class Application(ThreadedApplication):
# we got from master.
before_tid = p64(u64(self.last_tid) + 1)
data, tid, next_tid, _ = self._loadFromStorage(oid, tid, before_tid)
acquire()
try:
if self._loading_oid:
with lock:
loading = self._loading.pop(oid, None)
if loading:
assert loading[0] is load_lock
if not next_tid:
for t in self._loading_invalidated:
for t in loading[1]:
if tid < t:
next_tid = t
break
self._cache.store(oid, data, tid, next_tid)
# Else, we just reconnected to the master.
finally:
release()
finally:
self._load_lock_release()
load_lock.release()
except:
if acquired:
with lock:
self._loading.pop(oid, None)
load_lock.release()
raise
return data, tid, next_tid
def _loadFromStorage(self, oid, at_tid, before_tid):
......@@ -459,16 +468,6 @@ class Application(ThreadedApplication):
Packets.AskObject(oid, at_tid, before_tid),
askStorage)
def _loadFromCache(self, oid, at_tid=None, before_tid=None):
"""
Load from local cache, return None if not found.
"""
if at_tid:
result = self._cache.load(oid, at_tid + '*')
assert not result or result[1] == at_tid
return result
return self._cache.load(oid, before_tid)
def tpc_begin(self, storage, transaction, tid=None, status=' '):
"""Begin a new transaction."""
# First get a transaction, only one is allowed at a time
......@@ -670,7 +669,7 @@ class Application(ThreadedApplication):
txn_context = self._txn_container.pop(transaction)
if txn_context is None:
return
# We want that the involved nodes abort a transaction after any
# We want the involved nodes to abort a transaction after any
# other packet sent by the client for this transaction. IOW, if we
# already have a connection with a storage node, potentially with
# a pending write, aborting only via the master may lead to a race
......@@ -699,9 +698,8 @@ class Application(ThreadedApplication):
txn_context.conn_dict))
except ConnectionClosed:
pass
# We don't need to flush queue, as it won't be reused by future
# transactions (deleted on next line & indexed by transaction object
# instance).
# No need to flush queue, as it will be destroyed on return,
# along with txn_context.
self.dispatcher.forget_queue(txn_context.queue, flush_queue=False)
def tpc_finish(self, transaction, f=None):
......@@ -724,28 +722,22 @@ class Application(ThreadedApplication):
txn_container = self._txn_container
if not txn_container.get(transaction).voted:
self.tpc_vote(transaction)
checked_list = []
self._load_lock_acquire()
txn_context = txn_container.pop(transaction)
cache_dict = txn_context.cache_dict
checked_list = [oid for oid, data in cache_dict.iteritems()
if data is CHECKED_SERIAL]
for oid in checked_list:
del cache_dict[oid]
ttid = txn_context.ttid
p = Packets.AskFinishTransaction(ttid, cache_dict, checked_list)
try:
# Call finish on master
txn_context = txn_container.pop(transaction)
cache_dict = txn_context.cache_dict
checked_list = [oid for oid, data in cache_dict.iteritems()
if data is CHECKED_SERIAL]
for oid in checked_list:
del cache_dict[oid]
ttid = txn_context.ttid
p = Packets.AskFinishTransaction(ttid, cache_dict, checked_list)
try:
tid = self._askPrimary(p, cache_dict=cache_dict, callback=f)
assert tid
except ConnectionClosed:
tid = self._getFinalTID(ttid)
if not tid:
raise
return tid
finally:
self._load_lock_release()
tid = self._askPrimary(p, cache_dict=cache_dict, callback=f)
assert tid
except ConnectionClosed:
tid = self._getFinalTID(ttid)
if not tid:
raise
return tid
def _getFinalTID(self, ttid):
try:
......@@ -991,11 +983,8 @@ class Application(ThreadedApplication):
# It should not be otherwise required (clients should be free to load
# old data as long as it is available in cache, event if it was pruned
# by a pack), so don't bother invalidating on other clients.
self._cache_lock_acquire()
try:
with self._cache_lock:
self._cache.clear()
finally:
self._cache_lock_release()
def getLastTID(self, oid):
return self.load(oid)[1]
......
# -*- coding: utf-8 -*-
#
# Copyright (C) 2006-2019 Nexedi SA
#
......@@ -45,8 +46,7 @@ class PrimaryNotificationsHandler(MTEventHandler):
# Either we're connecting or we already know the last tid
# via invalidations.
assert app.master_conn is None, app.master_conn
app._cache_lock_acquire()
try:
with app._cache_lock:
if app_last_tid < ltid:
app._cache.clear_current()
# In the past, we tried not to invalidate the
......@@ -60,9 +60,7 @@ class PrimaryNotificationsHandler(MTEventHandler):
app._cache.clear()
# Make sure a parallel load won't refill the cache
# with garbage.
app._loading_oid = app._loading_invalidated = None
finally:
app._cache_lock_release()
app._loading.clear()
db = app.getDB()
db is None or db.invalidateCache()
app.last_tid = ltid
......@@ -70,21 +68,22 @@ class PrimaryNotificationsHandler(MTEventHandler):
def answerTransactionFinished(self, conn, _, tid, callback, cache_dict):
app = self.app
app.last_tid = tid
# Update cache
cache = app._cache
app._cache_lock_acquire()
try:
invalidate = cache.invalidate
loading_get = app._loading.get
with app._cache_lock:
for oid, data in cache_dict.iteritems():
# Update ex-latest value in cache
cache.invalidate(oid, tid)
invalidate(oid, tid)
loading = loading_get(oid)
if loading:
loading[1].append(tid)
if data is not None:
# Store in cache with no next_tid
cache.store(oid, data, tid, None)
if callback is not None:
callback(tid)
finally:
app._cache_lock_release()
app.last_tid = tid # see comment in invalidateObjects
def connectionClosed(self, conn):
app = self.app
......@@ -112,20 +111,24 @@ class PrimaryNotificationsHandler(MTEventHandler):
app = self.app
if app.ignore_invalidations:
return
app.last_tid = tid
app._cache_lock_acquire()
try:
with app._cache_lock:
invalidate = app._cache.invalidate
loading = app._loading_oid
loading_get = app._loading.get
for oid in oid_list:
invalidate(oid, tid)
if oid == loading:
app._loading_invalidated.append(tid)
loading = loading_get(oid)
if loading:
loading[1].append(tid)
db = app.getDB()
if db is not None:
db.invalidate(tid, oid_list)
finally:
app._cache_lock_release()
# ZODB<5: Update before releasing the lock so that app.load
# asks the last serial (with respect to already processed
# invalidations by Connection._setstate).
# ZODB≥5: Update after db.invalidate because the MVCC
# adapter starts at the greatest TID between
# IStorage.lastTransaction and processed invalidations.
app.last_tid = tid
def sendPartitionTable(self, conn, ptid, num_replicas, row_list):
pt = self.app.pt = object.__new__(PartitionTable)
......
......@@ -50,7 +50,7 @@ class Transaction(object):
self.conflict_dict = {} # {oid: serial}
# resolved conflicts
self.resolved_dict = {} # {oid: serial}
# involved storage nodes; connection is None is connection was lost
# involved storage nodes; connection is None if connection was lost
self.conn_dict = {} # {node_id: connection}
def __repr__(self):
......
......@@ -197,8 +197,7 @@ elif IF == 'trace-cache':
@defer
def profile(app):
app._cache_lock_acquire()
try:
with app._cache_lock:
cache = app._cache
if type(cache) is ClientCache:
app._cache = CacheTracer(cache, '%s-%s.neo-cache-trace' %
......@@ -206,5 +205,3 @@ elif IF == 'trace-cache':
app._cache.clear()
else:
app._cache = cache.close()
finally:
app._cache_lock_release()
......@@ -587,8 +587,8 @@ class Application(BaseApplication):
node.send(Packets.StartOperation(self.backup_tid))
uuid = node.getUUID()
assert uuid not in self.storage_starting_set
if uuid not in self.storage_ready_dict:
self.storage_starting_set.add(uuid)
assert uuid not in self.storage_ready_dict
self.storage_starting_set.add(uuid)
def setStorageReady(self, uuid):
self.storage_starting_set.remove(uuid)
......
......@@ -65,6 +65,7 @@ There is no conflict of node id between the 2 clusters:
class BackupApplication(object):
pt = None
server = None # like in BaseApplication
uuid = None
def __init__(self, app, name, master_addresses):
......
......@@ -781,11 +781,19 @@ class MySQLDatabaseManager(DatabaseManager):
if max_tid is not None:
sql += " AND tid <= %d" % max_tid
q = self.query
q("DELETE FROM trans" + sql)
if q("SELECT 1 FROM trans%s LIMIT 1" % sql):
q("DELETE FROM trans" + sql)
else:
logging.info("Nothing to truncate in trans for partition %s",
partition)
sql = " FROM obj" + sql
data_id_list = [x for x, in q(
"SELECT DISTINCT data_id%s AND data_id IS NOT NULL" % sql)]
q("DELETE" + sql)
if q("SELECT 1%s LIMIT 1" % sql):
q("DELETE" + sql)
else:
logging.info("Nothing to truncate in obj for partition %s",
partition)
self._pruneData(data_id_list)
def getTransaction(self, tid, all = False):
......
......@@ -34,7 +34,7 @@ class ClientOperationHandler(BaseHandler):
app = self.app
if app.operational:
# Even if in most cases, abortFor is called from both this method
# and BaseMasterHandler.notifyPartitionChanges (especially since
# and BaseMasterHandler.notifyNodeInformation (especially since
# storage nodes disconnects unknown clients on their own), these 2
# handlers also cover distinct scenarios, so neither of them is
# redundant:
......
......@@ -139,10 +139,11 @@ class TransactionManager(EventQueue):
def replicating(self, offset_list):
self._replicating.update(offset_list)
isdisjoint = set(offset_list).isdisjoint
assert isdisjoint(self._replicated), (offset_list, self._replicated)
assert isdisjoint(map(self.getPartition, self._store_lock_dict)), (
offset_list, self._store_lock_dict)
if __debug__:
isdisjoint = set(offset_list).isdisjoint
assert isdisjoint(self._replicated), (offset_list, self._replicated)
assert isdisjoint(map(self.getPartition, self._store_lock_dict)), (
offset_list, self._store_lock_dict)
p = Packets.AskUnfinishedTransactions(offset_list)
self._app.master_conn.ask(p, offset_list=offset_list)
......
......@@ -1084,8 +1084,7 @@ class NEOThreadedTest(NeoTestBase):
def run(self):
try:
apply(*self.__target)
self.__exc_info = None
self.__result = apply(*self.__target)
except:
self.__exc_info = sys.exc_info()
if self.__exc_info[0] is NEOThreadedTest.failureException:
......@@ -1093,10 +1092,13 @@ class NEOThreadedTest(NeoTestBase):
def join(self, timeout=None):
threading.Thread.join(self, timeout)
if not self.is_alive() and self.__exc_info:
etype, value, tb = self.__exc_info
del self.__exc_info
raise etype, value, tb
if not self.is_alive():
try:
return self.__result
except AttributeError:
etype, value, tb = self.__exc_info
del self.__exc_info
raise etype, value, tb
class newThread(newPausedThread):
......
# -*- coding: utf-8 -*-
#
# Copyright (C) 2011-2019 Nexedi SA
#
......@@ -865,6 +866,27 @@ class Test(NEOThreadedTest):
self.assertEqual(c.root()['1'].value, 1)
self.assertNotIn('2', c.root())
@with_cluster()
def testLoadVsFinish(self, cluster):
t1, c1 = cluster.getTransaction()
c1.root()['x'] = x1 = PCounter()
t1.commit()
t1.begin()
x1.value = 1
t2, c2 = cluster.getTransaction()
x2 = c2.root()['x']
cluster.client._cache.clear()
def _loadFromStorage(orig, *args):
r = orig(*args)
ll()
return r
with LockLock() as ll, Patch(cluster.client,
_loadFromStorage=_loadFromStorage):
t = self.newThread(x2._p_activate)
ll()
t1.commit()
t.join()
@with_cluster()
def testInternalInvalidation(self, cluster):
def _handlePacket(orig, conn, packet, kw={}, handler=None):
......@@ -887,6 +909,72 @@ class Test(NEOThreadedTest):
t.join()
self.assertEqual(x2.value, 1)
@with_cluster()
def testInternalInvalidation2(self, cluster):
# same as testExternalInvalidation3 but with internal invalidations
t, c = cluster.getTransaction()
x = c.root()[''] = PCounter()
t.commit()
l1 = threading.Lock(); l1.acquire()
l2 = threading.Lock(); l2.acquire()
def sync(orig):
orig()
l2.release()
l1.acquire()
def raceBeforeInvalidateZODB(orig, transaction, f):
def callback(tid):
l1.release()
begin1.join()
f(tid)
return orig(transaction, callback)
def raceAfterInvalidateZODB(orig, transaction, f):
def callback(tid):
f(tid)
l1.release()
begin1.join()
return orig(transaction, callback)
class CacheLock(object):
def __init__(self):
self._lock = client._cache_lock
def __enter__(self):
self._lock.acquire()
def __exit__(self, t, v, tb):
self._lock.release()
p.revert()
load1.start()
l1.acquire()
def _loadFromStorage(orig, *args):
l1.release()
return orig(*args)
client = cluster.client
t2, c2 = cluster.getTransaction()
x2 = c2.root()['']
x2.value = 1
with Patch(client, tpc_finish=raceBeforeInvalidateZODB):
with Patch(client, sync=sync):
begin1 = self.newThread(t.begin)
l2.acquire()
t2.commit()
self.assertEqual(x.value, 0)
x._p_deactivate()
# On ZODB≥5, the following check would fail
# if tpc_finish updated app.last_tid earlier.
self.assertEqual(x.value, 0)
t.begin()
self.assertEqual(x.value, 1)
x2.value = big = 'x' * cluster.cache_size # force load from storage
with Patch(client, _cache_lock=CacheLock()) as p, \
Patch(client, _loadFromStorage=_loadFromStorage), \
Patch(client, tpc_finish=raceAfterInvalidateZODB):
with Patch(client, sync=sync):
begin1 = self.newThread(t.begin)
l2.acquire()
load1 = self.newPausedThread(lambda: x.value)
t2.commit()
# On ZODB<5, the following check would fail
# if tpc_finish updated app.last_tid later.
self.assertEqual(load1.join(), big)
@with_cluster()
def testExternalInvalidation(self, cluster):
# Initialize objects
......@@ -952,6 +1040,8 @@ class Test(NEOThreadedTest):
t.join()
self.assertEqual(x2.value, 1)
self.assertEqual(x1.value, 0)
self.assertEqual((x2._p_serial, x1._p_serial),
cluster.client._cache.load(x1._p_oid, x1._p_serial)[1:])
def invalidations(conn):
try:
......@@ -989,7 +1079,7 @@ class Test(NEOThreadedTest):
x = r[''] = PCounter()
t.commit()
tid1 = x._p_serial
nonlocal_ = [0, 1]
nonlocal_ = [0, 0, 0]
l1 = threading.Lock(); l1.acquire()
l2 = threading.Lock(); l2.acquire()
def invalidateObjects(orig, *args):
......@@ -999,27 +1089,136 @@ class Test(NEOThreadedTest):
nonlocal_[0] += 1
if nonlocal_[0] == 2:
l2.release()
def _cache_lock_release(orig):
orig()
if nonlocal_[1]:
nonlocal_[1] = 0
class CacheLock(object):
def __init__(self, client):
self._lock = client._cache_lock
def __enter__(self):
self._lock.acquire()
def __exit__(self, t, v, tb):
count = nonlocal_[1]
nonlocal_[1] = count + 1
self._lock.release()
if count == 0:
load_same.start()
l2.acquire()
elif count == 1:
load_other.start()
def _loadFromStorage(orig, *args):
count = nonlocal_[2]
nonlocal_[2] = count + 1
if not count:
l1.release()
l2.acquire()
return orig(*args)
with cluster.newClient() as client, \
Patch(client.notifications_handler,
invalidateObjects=invalidateObjects):
client.sync()
with cluster.master.filterConnection(client) as mc2:
mc2.delayInvalidateObjects()
# A first client node (C1) modifies an oid whereas
# invalidations to the other node (C2) are delayed.
x._p_changed = 1
t.commit()
tid2 = x._p_serial
# C2 loads the most recent revision of this oid (last_tid=tid1).
self.assertEqual((tid1, tid2), client.load(x._p_oid)[1:])
# C2 poll thread is frozen just before processing invalidation
# packet for tid2. C1 modifies something else -> tid3
r._p_changed = 1
t.commit()
with Patch(client, _cache_lock_release=_cache_lock_release):
self.assertEqual((tid2, None), client.load(x._p_oid)[1:])
self.assertEqual(nonlocal_, [2, 0])
self.assertEqual(tid1, client.last_tid)
load_same = self.newPausedThread(client.load, x._p_oid)
load_other = self.newPausedThread(client.load, r._p_oid)
with Patch(client, _cache_lock=CacheLock(client)), \
Patch(client, _loadFromStorage=_loadFromStorage):
# 1. Just after having found nothing in cache, the worker
# thread asks the poll thread to get notified about
# invalidations for the loading oid.
# <context switch> (l1)
# 2. Both invalidations are processed. -> last_tid=tid3
# <context switch> (l2)
# 3. The worker thread loads before tid3+1.
# The poll thread notified [tid2], which must be ignored.
# In parallel, 2 other loads are done (both cache misses):
# - one for the same oid, which waits for first load to
# complete and in particular fill cache, in order to
# avoid asking the same data to the storage node
# - another for a different oid, which doesn't wait, as shown
# by the fact that it returns an old record (i.e. before any
# invalidation packet is processed)
loaded = client.load(x._p_oid)
self.assertEqual((tid2, None), loaded[1:])
self.assertEqual(loaded, load_same.join())
self.assertEqual((tid1, r._p_serial), load_other.join()[1:])
# To summary:
# - 3 concurrent loads starting with cache misses
# - 2 loads from storage
# - 1 load ending with a cache hit
self.assertEqual(nonlocal_, [2, 8, 2])
@with_cluster(serialized=False)
def testExternalInvalidation3(self, cluster):
# same as testInternalInvalidation2 but with external invalidations
t, c = cluster.getTransaction()
x = c.root()[''] = PCounter()
t.commit()
def sync(orig):
orig()
ll_sync()
def raceBeforeInvalidateZODB(orig, *args):
ll_inv()
orig(*args)
def raceAfterInvalidateZODB(orig, *args):
orig(*args)
ll_inv()
l1 = threading.Lock(); l1.acquire()
l2 = threading.Lock(); l2.acquire()
class CacheLock(object):
def __init__(self):
self._lock = client._cache_lock
def __enter__(self):
self._lock.acquire()
def __exit__(self, t, v, tb):
self._lock.release()
l1.release()
l2.acquire()
def _loadFromStorage(orig, *args):
l2.release()
return orig(*args)
client = cluster.client
with cluster.newClient(1) as db:
t2, c2 = cluster.getTransaction(db)
x2 = c2.root()['']
x2.value = 1
with Patch(client._db, invalidate=raceBeforeInvalidateZODB), \
LockLock() as ll_inv:
with Patch(client, sync=sync), LockLock() as ll_sync:
begin1 = self.newThread(t.begin)
ll_sync()
t2.commit()
ll_inv()
begin1.join()
self.assertEqual(x.value, 0)
x._p_deactivate()
# On ZODB≥5, the following check would fail if
# invalidateObjects updated app.last_tid earlier.
self.assertEqual(x.value, 0)
t.begin()
self.assertEqual(x.value, 1)
x2.value = 2
with Patch(client, _cache_lock=CacheLock()), \
Patch(client._db, invalidate=raceAfterInvalidateZODB), \
LockLock() as ll_inv:
with Patch(client, sync=sync), LockLock() as ll_sync:
begin1 = self.newThread(t.begin)
ll_sync()
t2.commit()
ll_inv()
begin1.join()
with Patch(client, _loadFromStorage=_loadFromStorage):
# On ZODB<5, the following check would fail if
# invalidateObjects updated app.last_tid later.
self.assertEqual(x.value, 2)
@with_cluster(storage_count=2, partitions=2)
def testReadVerifyingStorage(self, cluster):
......
......@@ -349,6 +349,22 @@ class ReplicationTests(NEOThreadedTest):
self.tic()
self.assertTrue(backup.master.is_alive())
@with_cluster(master_count=2)
def testBackupFromUpstreamWithSecondaryMaster(self, upstream):
"""
Check that the backup master reacts correctly when connecting first
to a secondary master of the upstream cluster.
"""
with NEOCluster(upstream=upstream) as backup:
primary = upstream.primary_master
m, = (m for m in upstream.master_list if m is not primary)
backup.master.resetNode(upstream_masters=[m.server])
backup.start()
backup.neoctl.setClusterState(ClusterStates.STARTING_BACKUP)
self.tic()
self.assertEqual(backup.neoctl.getClusterState(),
ClusterStates.BACKINGUP)
@backup_test()
def testCreationUndone(self, backup):
"""
......
......@@ -39,6 +39,14 @@ class BasicTests(ZODBTestCase, StorageTestBase, BasicStorage):
with Patch(threaded, TIC_LOOP=TIC_LOOP()):
super(BasicTests, self).check_checkCurrentSerialInTransaction()
# The test expects that both load & lastTransaction would be blocked
# as long as the tpc_finish callback has not finished, taking more
# than .1 second. ZODB 5.6.0 clarified that lastTransaction() can
# return immediately with the previous last TID rather than blocking
# until it is allowed to return the new last TID.
check_tid_ordering_w_commit = unittest.skip("ZODB PR #316")(
BasicStorage.check_tid_ordering_w_commit)
if __name__ == "__main__":
suite = unittest.makeSuite(BasicTests, 'check')
unittest.main(defaultTest='suite')
......
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