Examples with HelixDataAccessor org.apache.helix.HelixDataAccessor used on opensource projects

Example 61 with HelixDataAccessor

use of org.apache.helix.HelixDataAccessor in project helix by apache.

the class ParticipantHealthReportCollectorImpl method transmitHealthReports.

@Override
public synchronized void transmitHealthReports() {
    synchronized (_healthReportProviderList) {
        for (HealthReportProvider provider : _healthReportProviderList) {
            try {
                Map<String, String> report = provider.getRecentHealthReport();
                Map<String, Map<String, String>> partitionReport = provider.getRecentPartitionHealthReport();
                ZNRecord record = new ZNRecord(provider.getReportName());
                if (report != null) {
                    record.setSimpleFields(report);
                }
                if (partitionReport != null) {
                    record.setMapFields(partitionReport);
                }
                record.setSimpleField(HealthStat.TIMESTAMP_NAME, "" + System.currentTimeMillis());
                HelixDataAccessor accessor = _helixManager.getHelixDataAccessor();
                Builder keyBuilder = accessor.keyBuilder();
                if (!accessor.setProperty(keyBuilder.healthReport(_instanceName, record.getId()), new HealthStat(record))) {
                    LOG.error("Failed to persist health report to zk!");
                }
                provider.resetStats();
            } catch (Exception e) {
                LOG.error("fail to transmit health report", e);
            }
        }
    }
}

Example 62 with HelixDataAccessor

use of org.apache.helix.HelixDataAccessor in project helix by apache.

the class DistributedLeaderElection method onControllerChange.

/**
 * may be accessed by multiple threads: zk-client thread and
 * ZkHelixManager.disconnect()->reset() TODO: Refactor accessing
 * HelixMangerMain class statically
 */
@Override
public synchronized void onControllerChange(NotificationContext changeContext) {
    HelixManager manager = changeContext.getManager();
    if (manager == null) {
        LOG.error("missing attributes in changeContext. requires HelixManager");
        return;
    }
    InstanceType type = manager.getInstanceType();
    if (type != InstanceType.CONTROLLER && type != InstanceType.CONTROLLER_PARTICIPANT) {
        LOG.error("fail to become controller because incorrect instanceType (was " + type.toString() + ", requires CONTROLLER | CONTROLLER_PARTICIPANT)");
        return;
    }
    ControllerManagerHelper controllerHelper = new ControllerManagerHelper(_manager, _controllerTimerTasks);
    try {
        if (changeContext.getType().equals(NotificationContext.Type.INIT) || changeContext.getType().equals(NotificationContext.Type.CALLBACK)) {
            LOG.info(_manager.getInstanceName() + " is trying to acquire leadership for cluster: " + _manager.getClusterName());
            HelixDataAccessor accessor = manager.getHelixDataAccessor();
            Builder keyBuilder = accessor.keyBuilder();
            while (accessor.getProperty(keyBuilder.controllerLeader()) == null) {
                boolean success = tryUpdateController(manager);
                if (success) {
                    LOG.info(_manager.getInstanceName() + " acquired leadership for cluster: " + _manager.getClusterName());
                    updateHistory(manager);
                    _manager.getHelixDataAccessor().getBaseDataAccessor().reset();
                    controllerHelper.addListenersToController(_controller);
                    controllerHelper.startControllerTimerTasks();
                }
            }
        } else if (changeContext.getType().equals(NotificationContext.Type.FINALIZE)) {
            LOG.info(_manager.getInstanceName() + " relinquish leadership for cluster: " + _manager.getClusterName());
            controllerHelper.stopControllerTimerTasks();
            controllerHelper.removeListenersFromController(_controller);
            /**
             * clear write-through cache
             */
            _manager.getHelixDataAccessor().getBaseDataAccessor().reset();
        }
    } catch (Exception e) {
        LOG.error("Exception when trying to become leader", e);
    }
}

Example 63 with HelixDataAccessor

use of org.apache.helix.HelixDataAccessor in project helix by apache.

the class DistributedLeaderElection method tryUpdateController.

private boolean tryUpdateController(HelixManager manager) {
    HelixDataAccessor accessor = manager.getHelixDataAccessor();
    Builder keyBuilder = accessor.keyBuilder();
    LiveInstance leader = new LiveInstance(manager.getInstanceName());
    try {
        leader.setLiveInstance(ManagementFactory.getRuntimeMXBean().getName());
        leader.setSessionId(manager.getSessionId());
        leader.setHelixVersion(manager.getVersion());
        boolean success = accessor.createControllerLeader(leader);
        if (success) {
            return true;
        } else {
            LOG.info("Unable to become leader probably because some other controller becames the leader");
        }
    } catch (Exception e) {
        LOG.error("Exception when trying to updating leader record in cluster:" + manager.getClusterName() + ". Need to check again whether leader node has been created or not", e);
    }
    leader = accessor.getProperty(keyBuilder.controllerLeader());
    if (leader != null) {
        String leaderSessionId = leader.getSessionId();
        LOG.info("Leader exists for cluster: " + manager.getClusterName() + ", currentLeader: " + leader.getInstanceName() + ", leaderSessionId: " + leaderSessionId);
        if (leaderSessionId != null && leaderSessionId.equals(manager.getSessionId())) {
            return true;
        }
    }
    return false;
}

Example 64 with HelixDataAccessor

use of org.apache.helix.HelixDataAccessor in project helix by apache.

the class TestDisableCustomCodeRunner method test.

@Test
public void test() throws Exception {
    String className = TestHelper.getTestClassName();
    String methodName = TestHelper.getTestMethodName();
    String clusterName = className + "_" + methodName;
    System.out.println("START " + clusterName + " at " + new Date(System.currentTimeMillis()));
    // participant port
    TestHelper.setupCluster(// participant port
    clusterName, // participant port
    ZK_ADDR, // participant port
    12918, // participant name prefix
    "localhost", // resource name prefix
    "TestDB", // resources
    1, // partitions per resource
    PARTITION_NUM, // number of nodes
    N, // replicas
    2, "MasterSlave", // do rebalance
    true);
    ClusterControllerManager controller = new ClusterControllerManager(ZK_ADDR, clusterName, "controller");
    controller.syncStart();
    // start participants
    Map<String, MockParticipantManager> participants = new HashMap<String, MockParticipantManager>();
    Map<String, HelixCustomCodeRunner> customCodeRunners = new HashMap<String, HelixCustomCodeRunner>();
    Map<String, DummyCallback> callbacks = new HashMap<String, DummyCallback>();
    for (int i = 0; i < N; i++) {
        String instanceName = "localhost_" + (12918 + i);
        participants.put(instanceName, new MockParticipantManager(ZK_ADDR, clusterName, instanceName));
        customCodeRunners.put(instanceName, new HelixCustomCodeRunner(participants.get(instanceName), ZK_ADDR));
        callbacks.put(instanceName, new DummyCallback());
        customCodeRunners.get(instanceName).invoke(callbacks.get(instanceName)).on(ChangeType.LIVE_INSTANCE).usingLeaderStandbyModel("TestParticLeader").start();
        participants.get(instanceName).syncStart();
    }
    boolean result = ClusterStateVerifier.verifyByZkCallback(new ClusterStateVerifier.BestPossAndExtViewZkVerifier(ZK_ADDR, clusterName));
    Assert.assertTrue(result);
    // Make sure callback is registered
    BaseDataAccessor<ZNRecord> baseAccessor = new ZkBaseDataAccessor<ZNRecord>(_gZkClient);
    final HelixDataAccessor accessor = new ZKHelixDataAccessor(clusterName, baseAccessor);
    PropertyKey.Builder keyBuilder = accessor.keyBuilder();
    final String customCodeRunnerResource = customCodeRunners.get("localhost_12918").getResourceName();
    ExternalView extView = accessor.getProperty(keyBuilder.externalView(customCodeRunnerResource));
    Map<String, String> instanceStates = extView.getStateMap(customCodeRunnerResource + "_0");
    String leader = null;
    for (String instance : instanceStates.keySet()) {
        String state = instanceStates.get(instance);
        if ("LEADER".equals(state)) {
            leader = instance;
            break;
        }
    }
    Assert.assertNotNull(leader);
    for (String instance : callbacks.keySet()) {
        DummyCallback callback = callbacks.get(instance);
        if (instance.equals(leader)) {
            Assert.assertTrue(callback.isInitTypeInvoked());
        } else {
            Assert.assertFalse(callback.isInitTypeInvoked());
        }
        callback.reset();
    }
    // Disable custom-code runner resource
    HelixAdmin admin = new ZKHelixAdmin(_gZkClient);
    admin.enableResource(clusterName, customCodeRunnerResource, false);
    // Verify that states of custom-code runner are all OFFLINE
    result = TestHelper.verify(new TestHelper.Verifier() {

        @Override
        public boolean verify() throws Exception {
            PropertyKey.Builder keyBuilder = accessor.keyBuilder();
            ExternalView extView = accessor.getProperty(keyBuilder.externalView(customCodeRunnerResource));
            if (extView == null) {
                return false;
            }
            Set<String> partitionSet = extView.getPartitionSet();
            if (partitionSet == null || partitionSet.size() != PARTITION_NUM) {
                return false;
            }
            for (String partition : partitionSet) {
                Map<String, String> instanceStates = extView.getStateMap(partition);
                for (String state : instanceStates.values()) {
                    if (!"OFFLINE".equals(state)) {
                        return false;
                    }
                }
            }
            return true;
        }
    }, 10 * 1000);
    Assert.assertTrue(result);
    // Change live-instance should not invoke any custom-code runner
    LiveInstance fakeInstance = new LiveInstance("fakeInstance");
    fakeInstance.setSessionId("fakeSessionId");
    fakeInstance.setHelixVersion("0.6");
    accessor.setProperty(keyBuilder.liveInstance("fakeInstance"), fakeInstance);
    Thread.sleep(1000);
    for (Map.Entry<String, DummyCallback> e : callbacks.entrySet()) {
        String instance = e.getKey();
        DummyCallback callback = e.getValue();
        Assert.assertFalse(callback.isInitTypeInvoked());
        Assert.assertFalse(callback.isCallbackTypeInvoked());
        // Ensure that we were told that a leader stopped being the leader
        if (instance.equals(leader)) {
            Assert.assertTrue(callback.isFinalizeTypeInvoked());
        }
    }
    // Remove fake instance
    accessor.removeProperty(keyBuilder.liveInstance("fakeInstance"));
    // Re-enable custom-code runner
    admin.enableResource(clusterName, customCodeRunnerResource, true);
    result = ClusterStateVerifier.verifyByZkCallback(new ClusterStateVerifier.BestPossAndExtViewZkVerifier(ZK_ADDR, clusterName));
    Assert.assertTrue(result);
    // Verify that custom-invoke is invoked again
    extView = accessor.getProperty(keyBuilder.externalView(customCodeRunnerResource));
    instanceStates = extView.getStateMap(customCodeRunnerResource + "_0");
    leader = null;
    for (String instance : instanceStates.keySet()) {
        String state = instanceStates.get(instance);
        if ("LEADER".equals(state)) {
            leader = instance;
            break;
        }
    }
    Assert.assertNotNull(leader);
    for (String instance : callbacks.keySet()) {
        DummyCallback callback = callbacks.get(instance);
        if (instance.equals(leader)) {
            Assert.assertTrue(callback.isInitTypeInvoked());
        } else {
            Assert.assertFalse(callback.isInitTypeInvoked());
        }
        callback.reset();
    }
    // Add a fake instance should invoke custom-code runner
    accessor.setProperty(keyBuilder.liveInstance("fakeInstance"), fakeInstance);
    Thread.sleep(1000);
    for (String instance : callbacks.keySet()) {
        DummyCallback callback = callbacks.get(instance);
        if (instance.equals(leader)) {
            Assert.assertTrue(callback.isCallbackTypeInvoked());
        } else {
            Assert.assertFalse(callback.isCallbackTypeInvoked());
        }
    }
    // Clean up
    controller.syncStop();
    for (MockParticipantManager participant : participants.values()) {
        participant.syncStop();
    }
    System.out.println("END " + clusterName + " at " + new Date(System.currentTimeMillis()));
}

Example 65 with HelixDataAccessor

use of org.apache.helix.HelixDataAccessor in project helix by apache.

the class TestDisableResource method testDisableResourceInCustomMode.

@Test
public void testDisableResourceInCustomMode() throws Exception {
    String className = TestHelper.getTestClassName();
    String methodName = TestHelper.getTestMethodName();
    String clusterName = className + "_" + methodName;
    System.out.println("START " + clusterName + " at " + new Date(System.currentTimeMillis()));
    // participant port
    TestHelper.setupCluster(// participant port
    clusterName, // participant port
    ZK_ADDR, // participant port
    12918, // participant name prefix
    "localhost", // resource name prefix
    "TestDB", // resources
    1, // partitions per resource
    PARTITION_NUM, // number of nodes
    N, // replicas
    2, "MasterSlave", RebalanceMode.CUSTOMIZED, // do rebalance
    true);
    // set up custom ideal-state
    BaseDataAccessor<ZNRecord> baseAccessor = new ZkBaseDataAccessor<ZNRecord>(_gZkClient);
    HelixDataAccessor accessor = new ZKHelixDataAccessor(clusterName, baseAccessor);
    PropertyKey.Builder keyBuilder = accessor.keyBuilder();
    IdealState idealState = accessor.getProperty(keyBuilder.idealStates("TestDB0"));
    idealState.setPartitionState("TestDB0_0", "localhost_12918", "SLAVE");
    idealState.setPartitionState("TestDB0_0", "localhost_12919", "SLAVE");
    accessor.setProperty(keyBuilder.idealStates("TestDB0"), idealState);
    ClusterControllerManager controller = new ClusterControllerManager(ZK_ADDR, clusterName, "controller");
    controller.syncStart();
    // start participants
    MockParticipantManager[] participants = new MockParticipantManager[N];
    for (int i = 0; i < N; i++) {
        String instanceName = "localhost_" + (12918 + i);
        participants[i] = new MockParticipantManager(ZK_ADDR, clusterName, instanceName);
        participants[i].syncStart();
    }
    boolean result = ClusterStateVerifier.verifyByZkCallback(new ClusterStateVerifier.BestPossAndExtViewZkVerifier(ZK_ADDR, clusterName));
    Assert.assertTrue(result);
    // Disable TestDB0
    enableResource(clusterName, false);
    checkExternalView(clusterName);
    // Re-enable TestDB0
    enableResource(clusterName, true);
    result = ClusterStateVerifier.verifyByPolling(new ClusterStateVerifier.BestPossAndExtViewZkVerifier(ZK_ADDR, clusterName));
    Assert.assertTrue(result);
    // Clean up
    controller.syncStop();
    for (int i = 0; i < N; i++) {
        participants[i].syncStop();
    }
    System.out.println("END " + clusterName + " at " + new Date(System.currentTimeMillis()));
}