[GitHub] [activemq-artemis] clebertsuconic commented on a change in pull request #2743: ARTEMIS-2418 Race conditions between cursor movement and page writing

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clebertsuconic commented on a change in pull request #2743: ARTEMIS-2418 Race conditions between cursor movement and page writing
URL: https://github.com/apache/activemq-artemis/pull/2743#discussion_r303628565
 
 

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 File path: tests/extra-tests/src/test/java/org/apache/activemq/artemis/tests/extras/byteman/RaceOnCursorIteratorTest.java
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+/**
+ * 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
+ * <p/>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p/>
+ * 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.activemq.artemis.tests.extras.byteman;
+
+import java.util.HashMap;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+
+import org.apache.activemq.artemis.api.core.ActiveMQBuffer;
+import org.apache.activemq.artemis.api.core.SimpleString;
+import org.apache.activemq.artemis.api.core.client.ClientSession;
+import org.apache.activemq.artemis.api.core.client.ClientSessionFactory;
+import org.apache.activemq.artemis.api.core.client.ServerLocator;
+import org.apache.activemq.artemis.core.config.Configuration;
+import org.apache.activemq.artemis.core.message.impl.CoreMessage;
+import org.apache.activemq.artemis.core.paging.PagingStore;
+import org.apache.activemq.artemis.core.paging.cursor.PagedReference;
+import org.apache.activemq.artemis.core.server.ActiveMQServer;
+import org.apache.activemq.artemis.core.server.Queue;
+import org.apache.activemq.artemis.core.server.impl.RoutingContextImpl;
+import org.apache.activemq.artemis.core.settings.impl.AddressSettings;
+import org.apache.activemq.artemis.tests.util.ActiveMQTestBase;
+import org.apache.activemq.artemis.utils.RandomUtil;
+import org.jboss.byteman.contrib.bmunit.BMRule;
+import org.jboss.byteman.contrib.bmunit.BMRules;
+import org.jboss.byteman.contrib.bmunit.BMUnitRunner;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(BMUnitRunner.class)
+public class RaceOnCursorIteratorTest extends ActiveMQTestBase {
+
+   private static ServerLocator locator;
+
+   private static ActiveMQServer server;
+
+   private static ClientSessionFactory sf;
+
+   private static ClientSession session;
+
+   private static Queue queue;
+
+   private static final ReentrantReadWriteLock.ReadLock lock = new ReentrantReadWriteLock().readLock();
+
+   private static final int PAGE_MAX = 100 * 1024;
+
+   private static final int PAGE_SIZE = 10 * 1024;
+
+   static final SimpleString ADDRESS = new SimpleString("SimpleAddress");
+
+   static boolean skipLivePageCache = false;
+
+   static boolean skipNullPageCache = false;
+
+   static boolean moveNextPageCalled = false;
+
+   @Override
+   @Before
+   public void setUp() throws Exception {
+      super.setUp();
+      skipLivePageCache = false;
+      skipNullPageCache = false;
+      moveNextPageCalled = false;
+      locator = createInVMNonHALocator();
+
+      clearDataRecreateServerDirs();
+
+      Configuration config = createDefaultConfig(false);
+
+      config.setJournalSyncNonTransactional(false);
+
+      HashMap<String, AddressSettings> map = new HashMap<>();
+      AddressSettings value = new AddressSettings();
+      map.put(ADDRESS.toString(), value);
+      server = createServer(true, config, PAGE_SIZE, PAGE_MAX, map);
+
+      server.start();
+
+      locator = createInVMNonHALocator();
+
+      locator.setBlockOnNonDurableSend(true);
+      locator.setBlockOnDurableSend(true);
+      locator.setBlockOnAcknowledge(false);
+      locator.setConsumerWindowSize(0);
+
+      sf = createSessionFactory(locator);
+
+      session = sf.createSession(false, true, true);
+
+      session.createQueue(ADDRESS, ADDRESS, null, true);
+
+      queue = server.locateQueue(ADDRESS);
+      queue.getPageSubscription().getPagingStore().startPaging();
+   }
+
+   @Override
+   @After
+   public void tearDown() throws Exception {
+      session.close();
+      sf.close();
+      locator.close();
+      server.stop();
+      super.tearDown();
+   }
+
+   public static void raceAddLivePageCache() throws Exception {
+      if (skipLivePageCache) {
+         createMessage(1);
+
+         queue.getPageSubscription().getPagingStore().forceAnotherPage();
+
+         createMessage(2);
+      }
+      moveNextPageCalled = true;
+   }
+
+   public static void raceAddTwoCaches() throws Exception {
+      if (skipNullPageCache && moveNextPageCalled) {
+         createMessage(1);
+
+         queue.getPageSubscription().getPagingStore().forceAnotherPage();
+
+         createMessage(2);
+      }
+   }
+
+   @Test
+   @BMRules(
+      rules = {@BMRule(
+         name = "raceLiveCache",
+         targetClass = "org.apache.activemq.artemis.core.paging.cursor.impl.PageSubscriptionImpl",
+         targetMethod = "moveNextPage",
+         targetLocation = "EXIT",
+         action = "org.apache.activemq.artemis.tests.extras.byteman.RaceOnCursorIteratorTest.raceAddLivePageCache()")})
+   public void testSkipLivePageCache() {
+      skipLivePageCache = true;
+      // Simulate scenario #1 depicted in https://issues.apache.org/jira/browse/ARTEMIS-2418
+      PagedReference ref = queue.getPageSubscription().iterator().next();
+      assertTrue("first msg should not be " + (ref == null ? "null" : ref.getPagedMessage().getMessage().getMessageID()),
+                 ref == null || ref.getPagedMessage().getMessage().getMessageID() == 1);
+   }
+
+   @Test
+   @BMRules(
+      rules = {@BMRule(
 
 Review comment:
   Did you really need the byteman test? These test tend to be fragile. I have been personally avoiding them.
   
   
   Can you explain in english what the test is doing? I coudl read the byteman rule. but I got confused on what is the race.

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