def testQueueingReqFromFutureView(delayedPerf, looper, nodeSet, up, client1):
"""
Test if every node queues 3 Phase requests(PRE-PREPARE, PREPARE and COMMIT)
that come from a view which is greater than the current view
"""
f = getMaxFailures(nodeCount)
# Delay processing of instance change on a node
nodeA = nodeSet.Alpha
nodeA.nodeIbStasher.delay(icDelay(60))
nonPrimReps = getNonPrimaryReplicas(nodeSet, 0)
# Delay processing of PRE-PREPARE from all non primary replicas of master
# so master's throughput falls and view changes
ppDelayer = ppDelay(5, 0)
for r in nonPrimReps:
r.node.nodeIbStasher.delay(ppDelayer)
sendReqsToNodesAndVerifySuffReplies(looper, client1, 4, timeout=5 * nodeCount)
# Every node except Node A should have a view change
for node in nodeSet:
if node.name != nodeA.name:
looper.run(eventually(
partial(checkViewChangeInitiatedForNode, node, 0),
retryWait=1,
timeout=20))
# Node A's view should not have changed yet
with pytest.raises(AssertionError):
looper.run(eventually(partial(
checkViewChangeInitiatedForNode, nodeA, 0),
retryWait=1,
timeout=20))
# NodeA should not have any pending 3 phase request for a later view
for r in nodeA.replicas: # type: TestReplica
assert len(r.threePhaseMsgsForLaterView) == 0
# Reset delays on incoming messages from all nodes
for node in nodeSet:
node.nodeIbStasher.nodelay(ppDelayer)
# Send one more request
sendRandomRequest(client1)
def checkPending3PhaseReqs():
# Get all replicas that have their primary status decided
reps = [rep for rep in nodeA.replicas if rep.isPrimary is not None]
# Atleast one replica should have its primary status decided
assert len(reps) > 0
for r in reps: # type: TestReplica
logging.debug("primary status for replica {} is {}"
.format(r, r.primaryNames))
assert len(r.threePhaseMsgsForLaterView) > 0
# NodeA should now have pending 3 phase request for a later view
looper.run(eventually(checkPending3PhaseReqs, retryWait=1, timeout=30))
def viewChangeDone(nodeSet, looper, up, client1):
"""
Test that a view change is done when the performance of master goes down
"""
# Delay processing of PRE-PREPARE from all non primary replicas of master
# so master's performance falls and view changes
nonPrimReps = getNonPrimaryReplicas(nodeSet, 0)
for r in nonPrimReps:
r.node.nodeIbStasher.delay(ppDelay(10, 0))
sendReqsToNodesAndVerifySuffReplies(looper, client1, 4)
looper.run(eventually(partial(checkViewNoForNodes, nodeSet, 1),
retryWait=1, timeout=20))
def testElectionsAfterViewChange(delayedPerf, looper: Looper, nodeSet: TestNodeSet, up, client1):
"""
Test that a primary election does happen after a view change
"""
# Delay processing of PRE-PREPARE from all non primary replicas of master so master's throughput falls
# and view changes
nonPrimReps = getNonPrimaryReplicas(nodeSet, 0)
for r in nonPrimReps:
r.node.nodeIbStasher.delay(ppDelay(10, 0))
sendReqsToNodesAndVerifySuffReplies(looper, client1, 4)
# Ensure view change happened for both node and its primary elector
for node in nodeSet:
looper.run(eventually(partial(checkViewChangeInitiatedForNode, node, 0), retryWait=1, timeout=20))
# Ensure elections are done again and pool is setup again with appropriate protocol instances and each
# protocol instance is setup properly too
checkProtocolInstanceSetup(looper, nodeSet, retryWait=1, timeout=30)
def testViewNotChanged(looper: Looper, nodeSet: TestNodeSet, up, client1):
"""
Test that a view change is not done when the performance of master does
not go down
"""
"""
Send multiple requests to the client and delay some requests by all
backup instances to ensure master instance
is always faster than backup instances and there is no view change
"""
# Delay PRE-PREPARE for all backup protocol instances so master performs
# better
for i in range(1, F + 1):
nonPrimReps = getNonPrimaryReplicas(nodeSet, i)
# type: Iterable[TestReplica]
for r in nonPrimReps:
r.node.nodeIbStasher.delay(ppDelay(10, i))
sendReqsToNodesAndVerifySuffReplies(looper, client1, 5)
checkViewNoForNodes(nodeSet, 0)
def delaysPrePrepareProcessing(node, delay: float=30, instId: int=None):
node.nodeIbStasher.delay(ppDelay(delay=delay, instId=instId))