[PIP 79][client] Add lazy-loading feature to PartitionedProducer

pulsar-broker/src/test/java/org/apache/pulsar/client/api/ClientErrorsTest.java

@@ -33,6 +33,7 @@
 
 import lombok.Cleanup;
 import org.apache.pulsar.client.impl.ConsumerBase;
+import org.apache.pulsar.client.impl.PartitionedProducerImpl;
 import org.apache.pulsar.client.impl.ProducerBase;
 import org.apache.pulsar.common.api.proto.CommandLookupTopicResponse.LookupType;
 import org.apache.pulsar.common.api.proto.ServerError;
@@ -462,8 +463,100 @@ private void subscribeFailDoesNotFailOtherConsumer(String topic1, String topic2)
         mockBrokerService.resetHandleSubscribe();
     }
 
-    // if a producer fails to connect while creating partitioned producer, it should close all successful connections of
-    // other producers and fail
+    // failed to connect to partition at initialization step if a producer which connects to broker as lazy-loading mode
+    @Test
+    public void testPartitionedProducerFailOnInitialization() throws Throwable {
+        @Cleanup
+        PulsarClient client = PulsarClient.builder().serviceUrl(mockBrokerService.getHttpAddress()).build();
+        final AtomicInteger producerCounter = new AtomicInteger(0);
+
+        mockBrokerService.setHandleProducer((ctx, producer) -> {
+            if (producerCounter.incrementAndGet() == 1) {
+                ctx.writeAndFlush(Commands.newError(producer.getRequestId(), ServerError.AuthorizationError, "msg"));
+                return;
+            }
+            ctx.writeAndFlush(Commands.newProducerSuccess(producer.getRequestId(), "default-producer", SchemaVersion.Empty));
+        });
+
+        try {
+            client.newProducer()
+                    .enableLazyStartPartitionedProducers(true)
+                    .accessMode(ProducerAccessMode.Shared)
+                    .topic("persistent://prop/use/ns/multi-part-t1").create();
+            fail("Should have failed with an authorization error");
+        } catch (Exception e) {
+            assertTrue(e instanceof PulsarClientException.AuthorizationException);
+        }
+        assertEquals(producerCounter.get(), 1);
+
+        mockBrokerService.resetHandleProducer();
+        mockBrokerService.resetHandleCloseProducer();
+        client.close();
+    }
+
+    // failed to connect to partition at sending step if a producer which connects to broker as lazy-loading mode
+    @Test
+    public void testPartitionedProducerFailOnSending() throws Throwable {
+        @Cleanup
+        PulsarClient client = PulsarClient.builder().serviceUrl(mockBrokerService.getHttpAddress()).build();
+        final AtomicInteger producerCounter = new AtomicInteger(0);
+        final AtomicInteger closeCounter = new AtomicInteger(0);
+        final String topicName = "persistent://prop/use/ns/multi-part-t1";
+
+        mockBrokerService.setHandleProducer((ctx, producer) -> {
+            if (producerCounter.incrementAndGet() == 2) {
+                ctx.writeAndFlush(Commands.newError(producer.getRequestId(), ServerError.AuthorizationError, "msg"));
+                return;
+            }
+            ctx.writeAndFlush(Commands.newProducerSuccess(producer.getRequestId(), "default-producer", SchemaVersion.Empty));
+        });
+
+        mockBrokerService.setHandleSend((ctx, send, headersAndPayload) ->
+            ctx.writeAndFlush(Commands.newSendReceipt(send.getProducerId(), send.getSequenceId(), send.getHighestSequenceId(), 0L, 0L))
+        );
+
+        mockBrokerService.setHandleCloseProducer((ctx, closeProducer) -> {
+            ctx.writeAndFlush(Commands.newSuccess(closeProducer.getRequestId()));
+            closeCounter.incrementAndGet();
+        });
+
+        final PartitionedProducerImpl<byte[]> producer = (PartitionedProducerImpl<byte[]>) client.newProducer()
+                .enableLazyStartPartitionedProducers(true)
+                .accessMode(ProducerAccessMode.Shared)
+                .topic(topicName)
+                .enableBatching(false)
+                .messageRoutingMode(MessageRoutingMode.RoundRobinPartition)
+                .create();
+
+        try {
+            producer.send("msg".getBytes());
+            fail("Should have failed with an not connected exception");
+        } catch (Exception e) {
+            assertTrue(e instanceof PulsarClientException.NotConnectedException);
+            assertEquals(producer.getProducers().size(), 1);
+        }
+
+        try {
+            // recreate failed producer
+            for (int i = 0; i < client.getPartitionsForTopic(topicName).get().size(); i++) {
+                producer.send("msg".getBytes());
+            }
+            assertEquals(producer.getProducers().size(), client.getPartitionsForTopic(topicName).get().size());
+            assertEquals(producerCounter.get(), 5);
+        } catch (Exception e) {
+            fail();
+        }
+
+        // should not call close
+        assertEquals(closeCounter.get(), 0);
+
+        mockBrokerService.resetHandleProducer();
+        mockBrokerService.resetHandleCloseProducer();
+        client.close();
+    }
+
+    // if a producer which doesn't connect as lazy-loading mode fails to connect while creating partitioned producer,
+    // it should close all successful connections of other producers and fail
     @Test
     public void testOneProducerFailShouldCloseAllProducersInPartitionedProducer() throws Exception {
         @Cleanup

pulsar-broker/src/test/java/org/apache/pulsar/client/impl/PartialPartitionedProducerTest.java

@@ -0,0 +1,255 @@
+/**
+ * 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.pulsar.client.impl;
+
+import static org.testng.Assert.assertEquals;
+import static org.testng.Assert.assertTrue;
+
+import lombok.Cleanup;
+import lombok.extern.slf4j.Slf4j;
+import java.lang.reflect.Field;
+import java.util.concurrent.TimeUnit;
+import java.util.function.Supplier;
+import org.apache.pulsar.broker.BrokerTestUtil;
+import org.apache.pulsar.client.api.MessageRoutingMode;
+import org.apache.pulsar.client.api.ProducerAccessMode;
+import org.apache.pulsar.client.api.ProducerConsumerBase;
+import org.apache.pulsar.client.api.TopicMetadata;
+import org.apache.pulsar.client.impl.customroute.PartialRoundRobinMessageRouterImpl;
+import org.awaitility.Awaitility;
+import org.testng.annotations.AfterClass;
+import org.testng.annotations.BeforeClass;
+import org.testng.annotations.Test;
+
+@Slf4j
+@Test(groups = "broker-impl")
+public class PartialPartitionedProducerTest extends ProducerConsumerBase {
+    @Override
+    @BeforeClass
+    public void setup() throws Exception {
+        super.internalSetup();
+        super.producerBaseSetup();
+    }
+
+    @Override
+    @AfterClass(alwaysRun = true)
+    public void cleanup() throws Exception {
+        super.internalCleanup();
+    }
+
+    @Test
+    public void testPtWithSinglePartition() throws Throwable {
+        final String topic = BrokerTestUtil.newUniqueName("pt-with-single-routing");
+        admin.topics().createPartitionedTopic(topic, 10);
+
+        @Cleanup
+        final PartitionedProducerImpl<byte[]> producerImpl = (PartitionedProducerImpl<byte[]>) pulsarClient.newProducer()
+                .topic(topic)
+                .enableLazyStartPartitionedProducers(true)
+                .enableBatching(false)
+                .messageRoutingMode(MessageRoutingMode.SinglePartition)
+                .create();
+
+        for (int i = 0; i < 10; i++) {
+            producerImpl.newMessage().value("msg".getBytes()).send();
+        }
+        assertEquals(producerImpl.getProducers().size(), 1);
+    }
+
+    @Test
+    public void testPtWithPartialPartition() throws Throwable {
+        final String topic = BrokerTestUtil.newUniqueName("pt-with-partial-routing");
+        admin.topics().createPartitionedTopic(topic, 10);
+
+        @Cleanup
+        final PartitionedProducerImpl<byte[]> producerImpl = (PartitionedProducerImpl<byte[]>) pulsarClient.newProducer()
+                .topic(topic)
+                .enableLazyStartPartitionedProducers(true)
+                .enableBatching(false)
+                .messageRoutingMode(MessageRoutingMode.CustomPartition)
+                .messageRouter(new PartialRoundRobinMessageRouterImpl(3))
+                .create();
+
+        for (int i = 0; i < 10; i++) {
+            producerImpl.newMessage().value("msg".getBytes()).send();
+        }
+        assertEquals(producerImpl.getProducers().size(), 3);
+    }
+
+    // AddPartitionTest
+    @Test
+    public void testPtLazyLoading() throws Throwable {
+        final String topic = BrokerTestUtil.newUniqueName("pt-lazily");
+        admin.topics().createPartitionedTopic(topic, 10);
+
+        @Cleanup
+        final PartitionedProducerImpl<byte[]> producerImpl = (PartitionedProducerImpl<byte[]>) pulsarClient.newProducer()
+                .topic(topic)
+                .enableLazyStartPartitionedProducers(true)
+                .enableBatching(false)
+                .messageRoutingMode(MessageRoutingMode.RoundRobinPartition)
+                .create();
+
+        final Supplier<Boolean> send = () -> {
+            for (int i = 0; i < 10; i++) {
+                try {
+                    producerImpl.newMessage().value("msg".getBytes()).send();
+                } catch (Throwable e) {
+                    return false;
+                }
+            }
+            return true;
+        };
+
+        // create first producer at initialization step
+        assertEquals(producerImpl.getProducers().size(), 1);
+
+        assertTrue(send.get());
+        assertEquals(producerImpl.getProducers().size(), 10);
+    }
+
+    @Test
+    public void testPtLoadingNotSharedMode() throws Throwable {
+        final String topic = BrokerTestUtil.newUniqueName("pt-not-shared-mode");
+        admin.topics().createPartitionedTopic(topic, 10);
+
+        @Cleanup
+        final PartitionedProducerImpl<byte[]> producerImplExclusive = (PartitionedProducerImpl<byte[]>) pulsarClient.newProducer()
+                .topic(topic)
+                .enableLazyStartPartitionedProducers(true)
+                .enableBatching(false)
+                .accessMode(ProducerAccessMode.Exclusive)
+                .messageRoutingMode(MessageRoutingMode.RoundRobinPartition)
+                .create();
+
+        // create first producer at initialization step
+        assertEquals(producerImplExclusive.getProducers().size(), 10);
+
+        producerImplExclusive.close();
+
+        @Cleanup
+        final PartitionedProducerImpl<byte[]> producerImplWaitForExclusive = (PartitionedProducerImpl<byte[]>) pulsarClient.newProducer()
+                .topic(topic)
+                .enableLazyStartPartitionedProducers(true)
+                .enableBatching(false)
+                .accessMode(ProducerAccessMode.WaitForExclusive)
+                .messageRoutingMode(MessageRoutingMode.RoundRobinPartition)
+                .create();
+
+        assertEquals(producerImplWaitForExclusive.getProducers().size(), 10);
+    }
+
+    // AddPartitionAndLimitTest
+    @Test
+    public void testPtUpdateWithPartialPartition() throws Throwable {
+        final String topic = BrokerTestUtil.newUniqueName("pt-update-with-partial-routing");
+        admin.topics().createPartitionedTopic(topic, 2);
+
+        final Field field = PartitionedProducerImpl.class.getDeclaredField("topicMetadata");
+        field.setAccessible(true);
+        @Cleanup
+        final PartitionedProducerImpl<byte[]> producerImpl = (PartitionedProducerImpl<byte[]>) pulsarClient.newProducer()
+                .topic(topic)
+                .enableLazyStartPartitionedProducers(true)
+                .enableBatching(false)
+                .messageRoutingMode(MessageRoutingMode.CustomPartition)
+                .messageRouter(new PartialRoundRobinMessageRouterImpl(3))
+                .accessMode(ProducerAccessMode.Shared)
+                .autoUpdatePartitions(true)
+                .autoUpdatePartitionsInterval(1, TimeUnit.SECONDS)
+                .create();
+
+        final Supplier<Boolean> send = ()-> {
+            for (int i = 0; i < 10; i++) {
+                try {
+                    producerImpl.newMessage().value("msg".getBytes()).send();
+                } catch (Throwable e) {
+                    return false;
+                }
+            }
+            return true;
+        };
+
+        // create first producer at initialization step
+        assertEquals(producerImpl.getProducers().size(), 1);
+
+        assertTrue(send.get());
+        assertEquals(producerImpl.getProducers().size(), 2);
+
+        admin.topics().updatePartitionedTopic(topic, 3);
+        Awaitility.await().untilAsserted(() ->
+                assertEquals(((TopicMetadata) field.get(producerImpl)).numPartitions(), 3));
+        assertEquals(producerImpl.getProducers().size(), 2);
+
+        assertTrue(send.get());
+        assertEquals(producerImpl.getProducers().size(), 3);
+
+        admin.topics().updatePartitionedTopic(topic, 4);
+        Awaitility.await().untilAsserted(() ->
+                assertEquals(((TopicMetadata) field.get(producerImpl)).numPartitions(), 4));
+        assertTrue(send.get());
+        assertEquals(producerImpl.getProducers().size(), 3);
+    }
+
+    @Test
+    public void testPtUpdateNotSharedMode() throws Throwable {
+        final String topic = BrokerTestUtil.newUniqueName("pt-update-not-shared");
+        admin.topics().createPartitionedTopic(topic, 2);
+
+        final Field field = PartitionedProducerImpl.class.getDeclaredField("topicMetadata");
+        field.setAccessible(true);
+        @Cleanup
+        final PartitionedProducerImpl<byte[]> producerImplExclusive = (PartitionedProducerImpl<byte[]>) pulsarClient.newProducer()
+                .topic(topic)
+                .enableLazyStartPartitionedProducers(true)
+                .enableBatching(false)
+                .messageRoutingMode(MessageRoutingMode.RoundRobinPartition)
+                .accessMode(ProducerAccessMode.Exclusive)
+                .autoUpdatePartitions(true)
+                .autoUpdatePartitionsInterval(1, TimeUnit.SECONDS)
+                .create();
+
+        assertEquals(producerImplExclusive.getProducers().size(), 2);
+
+        admin.topics().updatePartitionedTopic(topic, 3);
+        Awaitility.await().untilAsserted(() ->
+                assertEquals(((TopicMetadata) field.get(producerImplExclusive)).numPartitions(), 3));
+        assertEquals(producerImplExclusive.getProducers().size(), 3);
+
+        producerImplExclusive.close();
+
+        @Cleanup
+        final PartitionedProducerImpl<byte[]> producerImplWaitForExclusive = (PartitionedProducerImpl<byte[]>) pulsarClient.newProducer()
+                .topic(topic)
+                .enableLazyStartPartitionedProducers(true)
+                .enableBatching(false)
+                .messageRoutingMode(MessageRoutingMode.RoundRobinPartition)
+                .accessMode(ProducerAccessMode.WaitForExclusive)
+                .autoUpdatePartitions(true)
+                .autoUpdatePartitionsInterval(1, TimeUnit.SECONDS)
+                .create();
+
+        assertEquals(producerImplWaitForExclusive.getProducers().size(), 3);
+
+        admin.topics().updatePartitionedTopic(topic, 4);
+        Awaitility.await().untilAsserted(() ->
+                assertEquals(((TopicMetadata) field.get(producerImplWaitForExclusive)).numPartitions(), 4));
+        assertEquals(producerImplWaitForExclusive.getProducers().size(), 4);
+    }
+}

pulsar-client-api/src/main/java/org/apache/pulsar/client/api/ProducerBuilder.java

@@ -576,4 +576,23 @@ public interface ProducerBuilder<T> extends Cloneable {
      * @since 2.5.0
      */
     ProducerBuilder<T> enableMultiSchema(boolean multiSchema);
+
+    /**
+     * This config affects Shared mode producers of partitioned topics only. It controls whether
+     * producers register and connect immediately to the owner broker of each partition
+     * or start lazily on demand. The internal producer of one partition is always
+     * started eagerly, chosen by the routing policy, but the internal producers of
+     * any additional partitions are started on demand, upon receiving their first
+     * message.
+     * Using this mode can reduce the strain on brokers for topics with large numbers of
+     * partitions and when the SinglePartition or some custom partial partition routing policy
+     * like PartialRoundRobinMessageRouterImpl is used without keyed messages.
+     * Because producer connection can be on demand, this can produce extra send latency
+     * for the first messages of a given partition.
+     *
+     * @param lazyStartPartitionedProducers
+     *            true/false as to whether to start partition producers lazily
+     * @return the producer builder instance
+     */
+    ProducerBuilder<T> enableLazyStartPartitionedProducers(boolean lazyStartPartitionedProducers);
 }