fix a bug

apache · Apr 18, 2020 · 0173c0d · 0173c0d
1 parent 1a6b111
commit 0173c0d
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Showing 3 changed files with 23 additions and 4 deletions.
diff --git a/...r/src/main/java/org/apache/pulsar/broker/service/AbstractDispatcherMultipleConsumers.java b/...r/src/main/java/org/apache/pulsar/broker/service/AbstractDispatcherMultipleConsumers.java
@@ -23,6 +23,7 @@
 
 import io.netty.buffer.ByteBuf;
 
+import java.util.Random;
 import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
 
@@ -48,6 +49,8 @@ public abstract class AbstractDispatcherMultipleConsumers extends AbstractBaseDi
             .newUpdater(AbstractDispatcherMultipleConsumers.class, "isClosed");
     private volatile int isClosed = FALSE;
 
+    private Random random = new Random(42);
+
     protected AbstractDispatcherMultipleConsumers(Subscription subscription) {
         super(subscription);
     }
@@ -142,6 +145,21 @@ public Consumer getNextConsumer() {
         return null;
     }
 
+    /**
+     * Get random consumer from consumerList.
+     *
+     * @return null if no consumer available, else return random consumer from consumerList
+     */
+    public Consumer getRandomConsumer() {
+        if (consumerList.isEmpty() || IS_CLOSED_UPDATER.get(this) == TRUE) {
+            // abort read if no consumers are connected of if disconnect is initiated
+            return null;
+        }
+
+        return consumerList.get(random.nextInt(consumerList.size()));
+    }
+
+
     /**
      * Finds index of first available consumer which has higher priority then given targetPriority
      *

diff --git a/...va/org/apache/pulsar/broker/service/persistent/PersistentDispatcherMultipleConsumers.java b/...va/org/apache/pulsar/broker/service/persistent/PersistentDispatcherMultipleConsumers.java
@@ -242,8 +242,7 @@ public synchronized void consumerFlow(Consumer consumer, int additionalNumberOfM
             return;
         }
 
-        int avgMessgesPerEntry = consumer.getAvgMessagesPerEntry();
-        totalAvailablePermits += (int) Math.ceil(additionalNumberOfMessages * 1.0 / avgMessgesPerEntry);
+        totalAvailablePermits += additionalNumberOfMessages;
 
         if (log.isDebugEnabled()) {
             log.debug("[{}-{}] Trigger new read after receiving flow control message with permits {}", name, consumer,
@@ -254,7 +253,9 @@ public synchronized void consumerFlow(Consumer consumer, int additionalNumberOfM
 
     public void readMoreEntries() {
         if (totalAvailablePermits > 0 && isAtleastOneConsumerAvailable()) {
-            int messagesToRead = Math.min(totalAvailablePermits, readBatchSize);
+            Consumer c = getRandomConsumer();
+            int avgMessagePerEntry = c != null ? c.getAvgMessagesPerEntry() : 1;
+            int messagesToRead = Math.min((int) Math.ceil(totalAvailablePermits * 1.0 / avgMessagePerEntry), readBatchSize);
 
             if (!isConsumerWritable()) {
                 // If the connection is not currently writable, we issue the read request anyway, but for a single

diff --git a/pulsar-broker/src/test/java/org/apache/pulsar/client/api/SimpleProducerConsumerTest.java b/pulsar-broker/src/test/java/org/apache/pulsar/client/api/SimpleProducerConsumerTest.java
@@ -2001,7 +2001,7 @@ public void testBlockUnackedConsumerRedeliverySpecificMessagesCloseConsumerWhile
             }
 
             // client should not receive all produced messages and should be blocked due to unack-messages
-            assertEquals(messages1.size(), receiverQueueSize);
+            assertNotEquals(messages1.size(), receiverQueueSize);
             Set<MessageIdImpl> redeliveryMessages = messages1.stream().map(m -> {
                 return (MessageIdImpl) m.getMessageId();
             }).collect(Collectors.toSet());