def tpc_abort(self, transaction):
"""Abort current transaction."""
txn_context = self._txn_container.pop(transaction)
if txn_context is None:
return
ttid = txn_context['ttid']
p = Packets.AbortTransaction(ttid)
getConnForNode = self.cp.getConnForNode
# cancel transaction one all those nodes
nodes = txn_context['involved_nodes']
nodes |= txn_context['checked_nodes']
for node in nodes:
conn = getConnForNode(node)
if conn is None:
continue
try:
conn.notify(p)
except:
logging.exception(
'Exception in tpc_abort while notifying'
'storage node %r of abortion, ignoring.', conn)
conn = self.master_conn
if conn is not None:
conn.notify(p)
# 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).
self.dispatcher.forget_queue(txn_context['queue'], flush_queue=False)
def notifyTransactionAborted(self, ttid, uuids):
uuid_set = self.getStorageReadySet()
uuid_set.intersection_update(uuids)
if uuid_set:
p = Packets.AbortTransaction(ttid, ())
getByUUID = self.nm.getByUUID
for uuid in uuid_set:
getByUUID(uuid).send(p)
def tpc_abort(self, transaction):
"""Abort current transaction."""
txn_context = self._txn_container.pop(transaction)
if txn_context is None:
return
# We want that the involved nodes 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
# condition. The consequence would be that storage nodes lock oids
# forever.
p = Packets.AbortTransaction(txn_context.ttid, ())
for conn in txn_context.conn_dict.itervalues():
if conn is not None:
try:
conn.send(p)
except ConnectionClosed:
pass
# Because we want to be sure that the involved nodes are notified,
# we still have to send the full list to the master. Most of the
# time, the storage nodes get 2 AbortTransaction packets, and the
# second one is rarely useful. Another option would be that the
# storage nodes keep a list of aborted transactions, but the
# difficult part would be to avoid a memory leak.
try:
notify = self.master_conn.send
except AttributeError:
pass
else:
try:
notify(
Packets.AbortTransaction(txn_context.ttid,
list(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).
self.dispatcher.forget_queue(txn_context.queue, flush_queue=False)
def abortTransaction(self, conn, tid, uuid_list):
# Consider a failure when the connection between the storage and the
# client breaks while the answer to the first write is sent back.
# In other words, the client can not know the exact set of nodes that
# know this transaction, and it sends us all nodes it considered for
# writing.
# We must also add those that are waiting for this transaction to be
# finished (returned by tm.abort), because they may have join the
# cluster after that the client started to abort.
app = self.app
involved = app.tm.abort(tid, conn.getUUID())
involved.update(uuid_list)
involved.intersection_update(app.getStorageReadySet())
if involved:
p = Packets.AbortTransaction(tid, ())
getByUUID = app.nm.getByUUID
for involved in involved:
getByUUID(involved).send(p)
