Commit 3cd10971 authored by Jim Fulton's avatar Jim Fulton

Fixed a serious bug that causes servers to stop commiting transactions

after conflict errors on blobs. :(
parent d27c82a6
......@@ -542,6 +542,7 @@ class ZEOStorage:
else:
self.storage.tpc_begin(self.transaction)
try:
loads, loader = self.txnlog.get_loader()
for i in range(loads):
store = loader.load()
......@@ -561,10 +562,13 @@ class ZEOStorage:
break
# Blob support
while self.blob_log:
while self.blob_log and not self.store_failed:
oid, oldserial, data, blobfilename = self.blob_log.pop()
self.storage.storeBlob(oid, oldserial, data, blobfilename,
'', self.transaction,)
self._store(oid, oldserial, data, blobfilename)
except:
self.storage.tpc_abort(self.transaction)
raise
resp = self._thunk()
if delay is not None:
......@@ -650,11 +654,15 @@ class ZEOStorage:
return err is None
def _store(self, oid, serial, data):
def _store(self, oid, serial, data, blobfile=None):
err = None
try:
newserial = self.storage.store(oid, serial, data, '',
self.transaction)
if blobfile is None:
newserial = self.storage.store(
oid, serial, data, '', self.transaction)
else:
newserial = self.storage.storeBlob(
oid, serial, data, blobfile, '', self.transaction)
except (SystemExit, KeyboardInterrupt):
raise
except Exception, err:
......
##############################################################################
#
# Copyright Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
from zope.testing import doctest, setupstack, renormalizing
import logging
import re
import sys
import transaction
import unittest
import ZEO.StorageServer
import ZEO.tests.servertesting
import ZODB.blob
import ZODB.FileStorage
import ZODB.tests.util
import ZODB.utils
def proper_handling_of_blob_conflicts():
r"""
Conflict errors weren't properly handled when storing blobs, the
result being that the storage was left in a transaction.
We originally saw this when restarting a block transaction, although
it doesn't really matter.
Set up the storage with some initial blob data.
>>> fs = ZODB.FileStorage.FileStorage('t.fs', blob_dir='t.blobs')
>>> db = ZODB.DB(fs)
>>> conn = db.open()
>>> conn.root.b = ZODB.blob.Blob('x')
>>> transaction.commit()
Get the iod and first serial. We'll use the serial later to provide
out-of-date data.
>>> oid = conn.root.b._p_oid
>>> serial = conn.root.b._p_serial
>>> conn.root.b.open('w').write('y')
>>> transaction.commit()
>>> data = fs.load(oid)[0]
Create the server:
>>> server = ZEO.tests.servertesting.StorageServer('x', {'1': fs})
And an initial client.
>>> zs1 = ZEO.StorageServer.ZEOStorage(server)
>>> conn1 = ZEO.tests.servertesting.Conection(1)
>>> zs1.notifyConnected(conn1)
>>> zs1.register('1', 0)
>>> zs1.tpc_begin('0', '', '', {})
>>> zs1.storea(ZODB.utils.p64(99), ZODB.utils.z64, 'x', '0')
>>> _ = zs1.vote('0') # doctest: +ELLIPSIS
1 callAsync serialnos ...
In a second client, we'll try to commit using the old serial. This
will conflict. It will be blocked at the vote call.
>>> zs2 = ZEO.StorageServer.ZEOStorage(server)
>>> conn2 = ZEO.tests.servertesting.Conection(2)
>>> zs2.notifyConnected(conn2)
>>> zs2.register('1', 0)
>>> zs2.tpc_begin('1', '', '', {})
>>> zs2.storeBlobStart()
>>> zs2.storeBlobChunk('z')
>>> zs2.storeBlobEnd(oid, serial, data, '1')
>>> delay = zs2.vote('1')
>>> def send_reply(id, reply):
... print 'reply', id, reply
>>> delay.set_sender(1, send_reply, None)
>>> logger = logging.getLogger('ZEO')
>>> handler = logging.StreamHandler(sys.stdout)
>>> logger.setLevel(logging.INFO)
>>> logger.addHandler(handler)
Now, whem we abort the transaction for the first client. the second
client will be restarted. It will get a conflict error, that is
handled correctly:
>>> zs1.tpc_abort('0') # doctest: +NORMALIZE_WHITESPACE
2 callAsync serialnos ([('\x00\x00\x00\x00\x00\x00\x00\x01',
ConflictError())],)
reply 1 None
(511/test-addr) Blocked transaction restarted.
>>> fs.tpc_transaction() is not None
True
>>> conn2.connected
True
>>> logger.setLevel(logging.NOTSET)
>>> logger.removeHandler(handler)
>>> fs.close()
"""
def proper_handling_of_errors_in_restart():
r"""
It's critical that if there is an error in _restart (ie vote) that the
storage isn't left in tpc.
>>> fs = ZODB.FileStorage.FileStorage('t.fs', blob_dir='t.blobs')
>>> server = ZEO.tests.servertesting.StorageServer('x', {'1': fs})
And an initial client.
>>> zs1 = ZEO.StorageServer.ZEOStorage(server)
>>> conn1 = ZEO.tests.servertesting.Conection(1)
>>> zs1.notifyConnected(conn1)
>>> zs1.register('1', 0)
>>> zs1.tpc_begin('0', '', '', {})
>>> zs1.storea(ZODB.utils.p64(99), ZODB.utils.z64, 'x', '0')
Intentionally break zs1:
>>> zs1._store = lambda : None
>>> _ = zs1.vote('0') # doctest: +ELLIPSIS
Traceback (most recent call last):
...
TypeError: <lambda>() takes no arguments (3 given)
We're not in a transaction:
>>> fs.tpc_transaction() is None
True
We can start another client and get the storage lock.
>>> zs1 = ZEO.StorageServer.ZEOStorage(server)
>>> conn1 = ZEO.tests.servertesting.Conection(1)
>>> zs1.notifyConnected(conn1)
>>> zs1.register('1', 0)
>>> zs1.tpc_begin('1', '', '', {})
>>> zs1.storea(ZODB.utils.p64(99), ZODB.utils.z64, 'x', '1')
>>> _ = zs1.vote('1') # doctest: +ELLIPSIS
1 callAsync serialnos ...
>>> zs1.tpc_finish('1') is not None
True
>>> fs.close()
"""
def test_suite():
return unittest.TestSuite((
doctest.DocTestSuite(
setUp=ZODB.tests.util.setUp, tearDown=setupstack.tearDown,
checker=renormalizing.RENormalizing([
(re.compile('\d+/test-addr'), ''),
]),
),
))
if __name__ == '__main__':
unittest.main(defaultTest='test_suite')
......@@ -1147,7 +1147,39 @@ class IBlobStorage(Interface):
(or copy and remove it) immediately, or at transaction-commit
time. The file must not be open.
The new serial is returned.
The new serial for the object is returned, but not necessarily
immediately. It may be returned directly, or on a subsequent
store or tpc_vote call.
The return value may be:
- None
- A new serial (string) for the object, or
- An iterable of object-id and serial pairs giving new serials
for objects.
A serial, returned as a string or in a sequence of oid/serial
pairs, may be the special value
ZODB.ConflictResolution.ResolvedSerial to indicate that a
conflict occured and that the object should be invalidated.
Several different exceptions may be raised when an error occurs.
ConflictError
is raised when serial does not match the most recent serial
number for object oid and the conflict was not resolved by
the storage.
StorageTransactionError
is raised when transaction does not match the current
transaction.
StorageError or, more often, a subclass of it
is raised when an internal error occurs while the storage is
handling the store() call.
"""
def loadBlob(oid, serial):
......
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