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Posted to notifications@geode.apache.org by GitBox <gi...@apache.org> on 2022/01/13 22:44:25 UTC

[GitHub] [geode] jinmeiliao opened a new pull request #7267: GEODE-9908: when make durable client queue primary, send marker messa…

jinmeiliao opened a new pull request #7267:
URL: https://github.com/apache/geode/pull/7267


   …ge directly instead of enqueue the marker
   


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[GitHub] [geode] pivotal-eshu commented on a change in pull request #7267: GEODE-9908: when make durable client queue primary, send marker messa…

Posted by GitBox <gi...@apache.org>.
pivotal-eshu commented on a change in pull request #7267:
URL: https://github.com/apache/geode/pull/7267#discussion_r785032390



##########
File path: geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/SlowDispatcherDUnitTest.java
##########
@@ -0,0 +1,160 @@
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
+ * agreements. See the NOTICE file distributed with this work for additional information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions and limitations under
+ * the License.
+ *
+ */
+package org.apache.geode.internal.cache.tier.sockets;
+
+import static org.apache.geode.distributed.ConfigurationProperties.DURABLE_CLIENT_ID;
+import static org.apache.geode.distributed.ConfigurationProperties.SECURITY_CLIENT_AUTH_INIT;
+import static org.apache.geode.test.awaitility.GeodeAwaitility.await;
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.stream.IntStream;
+
+import org.apache.logging.log4j.Logger;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+
+import org.apache.geode.cache.EntryEvent;
+import org.apache.geode.cache.InterestResultPolicy;
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.RegionEvent;
+import org.apache.geode.cache.RegionShortcut;
+import org.apache.geode.cache.client.ClientCache;
+import org.apache.geode.cache.client.ClientRegionShortcut;
+import org.apache.geode.cache.client.internal.Endpoint;
+import org.apache.geode.cache.client.internal.PoolImpl;
+import org.apache.geode.cache.util.CacheListenerAdapter;
+import org.apache.geode.logging.internal.log4j.api.LogService;
+import org.apache.geode.security.UpdatableUserAuthInitialize;
+import org.apache.geode.test.dunit.AsyncInvocation;
+import org.apache.geode.test.dunit.rules.ClientVM;
+import org.apache.geode.test.dunit.rules.ClusterStartupRule;
+import org.apache.geode.test.dunit.rules.MemberVM;
+import org.apache.geode.test.dunit.rules.SerializableFunction;
+import org.apache.geode.test.junit.rules.ClientCacheRule;
+import org.apache.geode.test.junit.rules.ServerStarterRule;
+
+public class SlowDispatcherDUnitTest {
+  public static final String PARTITION_REGION = "partitionRegion";
+  private MemberVM locator;
+  private MemberVM server1;
+  private MemberVM server2;
+
+  @Rule
+  public ClusterStartupRule cluster = new ClusterStartupRule();
+
+  @Rule
+  public ClientCacheRule clientCacheRule = new ClientCacheRule();
+
+  @Before
+  public void setup() {
+    locator = cluster.startLocatorVM(0);
+    int locatorPort = locator.getPort();
+    SerializableFunction<ServerStarterRule> serverStartRule =
+        s -> s.withRegion(RegionShortcut.PARTITION, PARTITION_REGION)
+            .withSystemProperty("slowStartTimeForTesting", "10000")
+            .withConnectionToLocator(locatorPort);
+    server1 = cluster.startServerVM(1, serverStartRule);
+    server2 = cluster.startServerVM(2, serverStartRule);
+
+    MemberVM.invokeInEveryMember(() -> {
+      CacheClientProxy.isSlowStartForTesting = true;
+    }, server1, server2);
+  }
+
+  private static KeyValueCacheListener myListener;
+
+  @Test
+  public void registeredInterest_durableClient_kill_primarySever_receives_marker()
+      throws Exception {
+    int locatorPort = locator.getPort();
+    int server1Port = server1.getPort();
+    int server2Port = server2.getPort();
+    ClientVM clientVM = cluster.startClientVM(3,
+        c -> c.withProperty(DURABLE_CLIENT_ID, "123456")
+            .withCacheSetup(
+                a -> a.setPoolSubscriptionRedundancy(2).setPoolSubscriptionEnabled(true)
+                    .setPoolMinConnections(2))
+            .withServerConnection(server1Port, server2Port));
+
+    clientVM.invoke(() -> {
+      myListener = new KeyValueCacheListener();
+      ClientCache clientCache = ClusterStartupRule.getClientCache();
+      Region<Object, Object> clientRegion =
+          clientCache.createClientRegionFactory(ClientRegionShortcut.CACHING_PROXY)
+              .addCacheListener(myListener)
+              .create(PARTITION_REGION);
+      clientRegion.registerInterestForAllKeys(InterestResultPolicy.KEYS, true);
+      clientCache.readyForEvents();
+    });
+
+    // create another client to do puts
+    ClientVM putClient = cluster.startClientVM(4,
+        c -> c.withProperty(SECURITY_CLIENT_AUTH_INIT, UpdatableUserAuthInitialize.class.getName())
+            .withPoolSubscription(false)
+            .withLocatorConnection(locatorPort));
+    AsyncInvocation putAsync = putClient.invokeAsync(() -> {
+      UpdatableUserAuthInitialize.setUser("putter");
+      Region<Object, Object> proxyRegion =
+          ClusterStartupRule.clientCacheRule.createProxyRegion(PARTITION_REGION);
+      IntStream.range(0, 50).forEach(i -> proxyRegion.put("key", i));
+    });
+
+    Boolean server1IsPrimary = clientVM.invoke(() -> {
+      ClientCache clientCache = ClusterStartupRule.getClientCache();
+      Endpoint endpoint =
+          ((PoolImpl) clientCache.getDefaultPool()).getPrimaryConnection().getEndpoint();
+      return endpoint.toString().contains("server-1");
+    });
+
+    MemberVM primary;
+    if (server1IsPrimary) {
+      primary = server1;
+    } else {
+      primary = server2;
+    }
+
+    primary.stop();
+    putAsync.await();
+
+    // make sure the client still gets all the events
+    clientVM.invoke(() -> {
+      Region clientRegion = ClusterStartupRule.getClientCache().getRegion(PARTITION_REGION);
+      await().untilAsserted(() -> assertThat(myListener.updateEventCount).isEqualTo(49));
+      assertThat(myListener.markerEventCount).isEqualTo(1);
+      assertThat(clientRegion.getEntry("key").getValue()).isEqualTo(49);
+    });
+
+  }
+
+  public static class KeyValueCacheListener extends CacheListenerAdapter<Object, Object> {
+    private static Logger logger = LogService.getLogger();
+    public int updateEventCount;
+    public int markerEventCount;
+
+    @Override
+    public void afterUpdate(EntryEvent event) {
+      logger.info("Jinmei: got event {}", event.getOperation().toString());

Review comment:
       Debug logging info should be removed.

##########
File path: geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/SlowDispatcherDUnitTest.java
##########
@@ -0,0 +1,160 @@
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
+ * agreements. See the NOTICE file distributed with this work for additional information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions and limitations under
+ * the License.
+ *
+ */
+package org.apache.geode.internal.cache.tier.sockets;
+
+import static org.apache.geode.distributed.ConfigurationProperties.DURABLE_CLIENT_ID;
+import static org.apache.geode.distributed.ConfigurationProperties.SECURITY_CLIENT_AUTH_INIT;
+import static org.apache.geode.test.awaitility.GeodeAwaitility.await;
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.stream.IntStream;
+
+import org.apache.logging.log4j.Logger;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+
+import org.apache.geode.cache.EntryEvent;
+import org.apache.geode.cache.InterestResultPolicy;
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.RegionEvent;
+import org.apache.geode.cache.RegionShortcut;
+import org.apache.geode.cache.client.ClientCache;
+import org.apache.geode.cache.client.ClientRegionShortcut;
+import org.apache.geode.cache.client.internal.Endpoint;
+import org.apache.geode.cache.client.internal.PoolImpl;
+import org.apache.geode.cache.util.CacheListenerAdapter;
+import org.apache.geode.logging.internal.log4j.api.LogService;
+import org.apache.geode.security.UpdatableUserAuthInitialize;
+import org.apache.geode.test.dunit.AsyncInvocation;
+import org.apache.geode.test.dunit.rules.ClientVM;
+import org.apache.geode.test.dunit.rules.ClusterStartupRule;
+import org.apache.geode.test.dunit.rules.MemberVM;
+import org.apache.geode.test.dunit.rules.SerializableFunction;
+import org.apache.geode.test.junit.rules.ClientCacheRule;
+import org.apache.geode.test.junit.rules.ServerStarterRule;
+
+public class SlowDispatcherDUnitTest {
+  public static final String PARTITION_REGION = "partitionRegion";
+  private MemberVM locator;
+  private MemberVM server1;
+  private MemberVM server2;
+
+  @Rule
+  public ClusterStartupRule cluster = new ClusterStartupRule();
+
+  @Rule
+  public ClientCacheRule clientCacheRule = new ClientCacheRule();
+
+  @Before
+  public void setup() {
+    locator = cluster.startLocatorVM(0);
+    int locatorPort = locator.getPort();
+    SerializableFunction<ServerStarterRule> serverStartRule =
+        s -> s.withRegion(RegionShortcut.PARTITION, PARTITION_REGION)
+            .withSystemProperty("slowStartTimeForTesting", "10000")
+            .withConnectionToLocator(locatorPort);
+    server1 = cluster.startServerVM(1, serverStartRule);
+    server2 = cluster.startServerVM(2, serverStartRule);
+
+    MemberVM.invokeInEveryMember(() -> {
+      CacheClientProxy.isSlowStartForTesting = true;
+    }, server1, server2);
+  }
+
+  private static KeyValueCacheListener myListener;
+
+  @Test
+  public void registeredInterest_durableClient_kill_primarySever_receives_marker()
+      throws Exception {
+    int locatorPort = locator.getPort();
+    int server1Port = server1.getPort();
+    int server2Port = server2.getPort();
+    ClientVM clientVM = cluster.startClientVM(3,
+        c -> c.withProperty(DURABLE_CLIENT_ID, "123456")
+            .withCacheSetup(
+                a -> a.setPoolSubscriptionRedundancy(2).setPoolSubscriptionEnabled(true)
+                    .setPoolMinConnections(2))
+            .withServerConnection(server1Port, server2Port));
+
+    clientVM.invoke(() -> {
+      myListener = new KeyValueCacheListener();
+      ClientCache clientCache = ClusterStartupRule.getClientCache();
+      Region<Object, Object> clientRegion =
+          clientCache.createClientRegionFactory(ClientRegionShortcut.CACHING_PROXY)
+              .addCacheListener(myListener)
+              .create(PARTITION_REGION);
+      clientRegion.registerInterestForAllKeys(InterestResultPolicy.KEYS, true);
+      clientCache.readyForEvents();
+    });
+
+    // create another client to do puts
+    ClientVM putClient = cluster.startClientVM(4,
+        c -> c.withProperty(SECURITY_CLIENT_AUTH_INIT, UpdatableUserAuthInitialize.class.getName())
+            .withPoolSubscription(false)
+            .withLocatorConnection(locatorPort));
+    AsyncInvocation putAsync = putClient.invokeAsync(() -> {
+      UpdatableUserAuthInitialize.setUser("putter");
+      Region<Object, Object> proxyRegion =
+          ClusterStartupRule.clientCacheRule.createProxyRegion(PARTITION_REGION);
+      IntStream.range(0, 50).forEach(i -> proxyRegion.put("key", i));
+    });
+
+    Boolean server1IsPrimary = clientVM.invoke(() -> {
+      ClientCache clientCache = ClusterStartupRule.getClientCache();
+      Endpoint endpoint =
+          ((PoolImpl) clientCache.getDefaultPool()).getPrimaryConnection().getEndpoint();
+      return endpoint.toString().contains("server-1");
+    });
+
+    MemberVM primary;
+    if (server1IsPrimary) {
+      primary = server1;
+    } else {
+      primary = server2;
+    }
+
+    primary.stop();
+    putAsync.await();
+
+    // make sure the client still gets all the events
+    clientVM.invoke(() -> {
+      Region clientRegion = ClusterStartupRule.getClientCache().getRegion(PARTITION_REGION);
+      await().untilAsserted(() -> assertThat(myListener.updateEventCount).isEqualTo(49));
+      assertThat(myListener.markerEventCount).isEqualTo(1);
+      assertThat(clientRegion.getEntry("key").getValue()).isEqualTo(49);
+    });
+
+  }
+
+  public static class KeyValueCacheListener extends CacheListenerAdapter<Object, Object> {
+    private static Logger logger = LogService.getLogger();
+    public int updateEventCount;
+    public int markerEventCount;
+
+    @Override
+    public void afterUpdate(EntryEvent event) {
+      logger.info("Jinmei: got event {}", event.getOperation().toString());
+      updateEventCount++;
+    }
+
+    public void afterRegionLive(RegionEvent event) {
+      markerEventCount++;
+      logger.info("Jinmei: got event {}", event.getOperation().toString());

Review comment:
       Debug logging info should be removed.
   

##########
File path: geode-core/src/main/java/org/apache/geode/internal/cache/tier/sockets/CacheClientProxy.java
##########
@@ -1673,13 +1673,16 @@ MessageDispatcher createMessageDispatcher(String name) {
     return messageDispatcherFactory.create(this, name, statisticsClock);
   }
 
-  protected void startOrResumeMessageDispatcher(boolean processedMarker) {
+  protected void startOrResumeMessageDispatcher(boolean sendMarkerDirectly) {
     // Only start or resume the dispatcher if it is Primary
     if (isPrimary) {
       // Add the marker to the queue
-      if (!processedMarker) {
-        EventID eventId = new EventID(_cache.getDistributedSystem());
-        _messageDispatcher.enqueueMarker(new ClientMarkerMessageImpl(eventId));
+      EventID eventId = new EventID(_cache.getDistributedSystem());
+      ClientMarkerMessageImpl clientMarkerMessage = new ClientMarkerMessageImpl(eventId);
+      if (sendMarkerDirectly) {
+        sendMessageDirectly(clientMarkerMessage);

Review comment:
       Will this cause unforeseen consequences if Dispatcher is not yet started/resumed but send message first? The method later starts dispatcher thread.
   
   




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[GitHub] [geode] jinmeiliao commented on a change in pull request #7267: GEODE-9908: when make durable client queue primary, send marker messa…

Posted by GitBox <gi...@apache.org>.
jinmeiliao commented on a change in pull request #7267:
URL: https://github.com/apache/geode/pull/7267#discussion_r785058213



##########
File path: geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/SlowDispatcherDUnitTest.java
##########
@@ -0,0 +1,160 @@
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
+ * agreements. See the NOTICE file distributed with this work for additional information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions and limitations under
+ * the License.
+ *
+ */
+package org.apache.geode.internal.cache.tier.sockets;
+
+import static org.apache.geode.distributed.ConfigurationProperties.DURABLE_CLIENT_ID;
+import static org.apache.geode.distributed.ConfigurationProperties.SECURITY_CLIENT_AUTH_INIT;
+import static org.apache.geode.test.awaitility.GeodeAwaitility.await;
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.stream.IntStream;
+
+import org.apache.logging.log4j.Logger;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+
+import org.apache.geode.cache.EntryEvent;
+import org.apache.geode.cache.InterestResultPolicy;
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.RegionEvent;
+import org.apache.geode.cache.RegionShortcut;
+import org.apache.geode.cache.client.ClientCache;
+import org.apache.geode.cache.client.ClientRegionShortcut;
+import org.apache.geode.cache.client.internal.Endpoint;
+import org.apache.geode.cache.client.internal.PoolImpl;
+import org.apache.geode.cache.util.CacheListenerAdapter;
+import org.apache.geode.logging.internal.log4j.api.LogService;
+import org.apache.geode.security.UpdatableUserAuthInitialize;
+import org.apache.geode.test.dunit.AsyncInvocation;
+import org.apache.geode.test.dunit.rules.ClientVM;
+import org.apache.geode.test.dunit.rules.ClusterStartupRule;
+import org.apache.geode.test.dunit.rules.MemberVM;
+import org.apache.geode.test.dunit.rules.SerializableFunction;
+import org.apache.geode.test.junit.rules.ClientCacheRule;
+import org.apache.geode.test.junit.rules.ServerStarterRule;
+
+public class SlowDispatcherDUnitTest {
+  public static final String PARTITION_REGION = "partitionRegion";
+  private MemberVM locator;
+  private MemberVM server1;
+  private MemberVM server2;
+
+  @Rule
+  public ClusterStartupRule cluster = new ClusterStartupRule();
+
+  @Rule
+  public ClientCacheRule clientCacheRule = new ClientCacheRule();
+
+  @Before
+  public void setup() {
+    locator = cluster.startLocatorVM(0);
+    int locatorPort = locator.getPort();
+    SerializableFunction<ServerStarterRule> serverStartRule =
+        s -> s.withRegion(RegionShortcut.PARTITION, PARTITION_REGION)
+            .withSystemProperty("slowStartTimeForTesting", "10000")
+            .withConnectionToLocator(locatorPort);
+    server1 = cluster.startServerVM(1, serverStartRule);
+    server2 = cluster.startServerVM(2, serverStartRule);
+
+    MemberVM.invokeInEveryMember(() -> {
+      CacheClientProxy.isSlowStartForTesting = true;
+    }, server1, server2);
+  }
+
+  private static KeyValueCacheListener myListener;
+
+  @Test
+  public void registeredInterest_durableClient_kill_primarySever_receives_marker()
+      throws Exception {
+    int locatorPort = locator.getPort();
+    int server1Port = server1.getPort();
+    int server2Port = server2.getPort();
+    ClientVM clientVM = cluster.startClientVM(3,
+        c -> c.withProperty(DURABLE_CLIENT_ID, "123456")
+            .withCacheSetup(
+                a -> a.setPoolSubscriptionRedundancy(2).setPoolSubscriptionEnabled(true)
+                    .setPoolMinConnections(2))
+            .withServerConnection(server1Port, server2Port));
+
+    clientVM.invoke(() -> {
+      myListener = new KeyValueCacheListener();
+      ClientCache clientCache = ClusterStartupRule.getClientCache();
+      Region<Object, Object> clientRegion =
+          clientCache.createClientRegionFactory(ClientRegionShortcut.CACHING_PROXY)
+              .addCacheListener(myListener)
+              .create(PARTITION_REGION);
+      clientRegion.registerInterestForAllKeys(InterestResultPolicy.KEYS, true);
+      clientCache.readyForEvents();
+    });
+
+    // create another client to do puts
+    ClientVM putClient = cluster.startClientVM(4,
+        c -> c.withProperty(SECURITY_CLIENT_AUTH_INIT, UpdatableUserAuthInitialize.class.getName())
+            .withPoolSubscription(false)
+            .withLocatorConnection(locatorPort));
+    AsyncInvocation putAsync = putClient.invokeAsync(() -> {
+      UpdatableUserAuthInitialize.setUser("putter");
+      Region<Object, Object> proxyRegion =
+          ClusterStartupRule.clientCacheRule.createProxyRegion(PARTITION_REGION);
+      IntStream.range(0, 50).forEach(i -> proxyRegion.put("key", i));
+    });
+
+    Boolean server1IsPrimary = clientVM.invoke(() -> {
+      ClientCache clientCache = ClusterStartupRule.getClientCache();
+      Endpoint endpoint =
+          ((PoolImpl) clientCache.getDefaultPool()).getPrimaryConnection().getEndpoint();
+      return endpoint.toString().contains("server-1");
+    });
+
+    MemberVM primary;
+    if (server1IsPrimary) {
+      primary = server1;
+    } else {
+      primary = server2;
+    }
+
+    primary.stop();
+    putAsync.await();
+
+    // make sure the client still gets all the events
+    clientVM.invoke(() -> {
+      Region clientRegion = ClusterStartupRule.getClientCache().getRegion(PARTITION_REGION);
+      await().untilAsserted(() -> assertThat(myListener.updateEventCount).isEqualTo(49));
+      assertThat(myListener.markerEventCount).isEqualTo(1);
+      assertThat(clientRegion.getEntry("key").getValue()).isEqualTo(49);
+    });
+
+  }
+
+  public static class KeyValueCacheListener extends CacheListenerAdapter<Object, Object> {
+    private static Logger logger = LogService.getLogger();
+    public int updateEventCount;
+    public int markerEventCount;
+
+    @Override
+    public void afterUpdate(EntryEvent event) {
+      logger.info("Jinmei: got event {}", event.getOperation().toString());

Review comment:
       done




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[GitHub] [geode] jinmeiliao merged pull request #7267: GEODE-9908: when make durable client queue primary, send marker messa…

Posted by GitBox <gi...@apache.org>.
jinmeiliao merged pull request #7267:
URL: https://github.com/apache/geode/pull/7267


   


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[GitHub] [geode] jinmeiliao commented on a change in pull request #7267: GEODE-9908: when make durable client queue primary, send marker messa…

Posted by GitBox <gi...@apache.org>.
jinmeiliao commented on a change in pull request #7267:
URL: https://github.com/apache/geode/pull/7267#discussion_r785043634



##########
File path: geode-core/src/main/java/org/apache/geode/internal/cache/tier/sockets/CacheClientProxy.java
##########
@@ -1673,13 +1673,16 @@ MessageDispatcher createMessageDispatcher(String name) {
     return messageDispatcherFactory.create(this, name, statisticsClock);
   }
 
-  protected void startOrResumeMessageDispatcher(boolean processedMarker) {
+  protected void startOrResumeMessageDispatcher(boolean sendMarkerDirectly) {
     // Only start or resume the dispatcher if it is Primary
     if (isPrimary) {
       // Add the marker to the queue
-      if (!processedMarker) {
-        EventID eventId = new EventID(_cache.getDistributedSystem());
-        _messageDispatcher.enqueueMarker(new ClientMarkerMessageImpl(eventId));
+      EventID eventId = new EventID(_cache.getDistributedSystem());
+      ClientMarkerMessageImpl clientMarkerMessage = new ClientMarkerMessageImpl(eventId);
+      if (sendMarkerDirectly) {
+        sendMessageDirectly(clientMarkerMessage);

Review comment:
       I can't see any bad consequence. It's just a marker message that is supposed to go to the client anyway.




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