public void testChangeIdealStateWithPendingMsg() {
String clusterName = "CLUSTER_" + _className + "_pending";
System.out.println("START " + clusterName + " at " + new Date(System.currentTimeMillis()));
HelixDataAccessor accessor =
new ZKHelixDataAccessor(clusterName, new ZkBaseDataAccessor<ZNRecord>(_gZkClient));
HelixManager manager = new DummyClusterManager(clusterName, accessor);
ClusterEvent event = new ClusterEvent("testEvent");
event.addAttribute("helixmanager", manager);
final String resourceName = "testResource_pending";
String[] resourceGroups = new String[] {
resourceName
};
// ideal state: node0 is MASTER, node1 is SLAVE
// replica=2 means 1 master and 1 slave
setupIdealState(clusterName, new int[] {
0, 1
}, resourceGroups, 1, 2);
setupLiveInstances(clusterName, new int[] {
0, 1
});
setupStateModel(clusterName);
// cluster data cache refresh pipeline
Pipeline dataRefresh = new Pipeline();
dataRefresh.addStage(new ReadClusterDataStage());
// rebalance pipeline
Pipeline rebalancePipeline = new Pipeline();
rebalancePipeline.addStage(new ResourceComputationStage());
rebalancePipeline.addStage(new CurrentStateComputationStage());
rebalancePipeline.addStage(new BestPossibleStateCalcStage());
rebalancePipeline.addStage(new MessageGenerationPhase());
rebalancePipeline.addStage(new MessageSelectionStage());
rebalancePipeline.addStage(new MessageThrottleStage());
rebalancePipeline.addStage(new TaskAssignmentStage());
// round1: set node0 currentState to OFFLINE and node1 currentState to SLAVE
setCurrentState(clusterName, "localhost_0", resourceName, resourceName + "_0", "session_0",
"OFFLINE");
setCurrentState(clusterName, "localhost_1", resourceName, resourceName + "_0", "session_1",
"SLAVE");
runPipeline(event, dataRefresh);
runPipeline(event, rebalancePipeline);
MessageSelectionStageOutput msgSelOutput =
event.getAttribute(AttributeName.MESSAGES_SELECTED.toString());
List<Message> messages =
msgSelOutput.getMessages(resourceName, new Partition(resourceName + "_0"));
Assert.assertEquals(messages.size(), 1, "Should output 1 message: OFFLINE-SLAVE for node0");
Message message = messages.get(0);
Assert.assertEquals(message.getFromState(), "OFFLINE");
Assert.assertEquals(message.getToState(), "SLAVE");
Assert.assertEquals(message.getTgtName(), "localhost_0");
// round2: drop resource, but keep the
// message, make sure controller should not send O->DROPPEDN until O->S is done
HelixAdmin admin = new ZKHelixAdmin(_gZkClient);
admin.dropResource(clusterName, resourceName);
runPipeline(event, dataRefresh);
runPipeline(event, rebalancePipeline);
msgSelOutput = event.getAttribute(AttributeName.MESSAGES_SELECTED.toString());
messages = msgSelOutput.getMessages(resourceName, new Partition(resourceName + "_0"));
Assert.assertEquals(messages.size(), 1,
"Should output only 1 message: OFFLINE->DROPPED for localhost_1");
message = messages.get(0);
Assert.assertEquals(message.getFromState(), "SLAVE");
Assert.assertEquals(message.getToState(), "OFFLINE");
Assert.assertEquals(message.getTgtName(), "localhost_1");
// round3: remove O->S for localhost_0, controller should now send O->DROPPED to
// localhost_0
Builder keyBuilder = accessor.keyBuilder();
List<String> msgIds = accessor.getChildNames(keyBuilder.messages("localhost_0"));
accessor.removeProperty(keyBuilder.message("localhost_0", msgIds.get(0)));
runPipeline(event, dataRefresh);
runPipeline(event, rebalancePipeline);
msgSelOutput = event.getAttribute(AttributeName.MESSAGES_SELECTED.toString());
messages = msgSelOutput.getMessages(resourceName, new Partition(resourceName + "_0"));
Assert.assertEquals(messages.size(), 1,