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Fix messages in TopicPolicies will never be cleaned up #11928

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merged 4 commits into from
Sep 20, 2021
Merged

Fix messages in TopicPolicies will never be cleaned up #11928

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f14a1fa
Fix messages in TopicPolicies will never be cleaned up
315157973 Sep 5, 2021
17f8b7c
Code format
315157973 Sep 6, 2021
50e0039
Add compatibility adaptation
315157973 Sep 6, 2021
dac4bac
Close writer
315157973 Sep 6, 2021
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42 changes: 26 additions & 16 deletions .../src/main/java/org/apache/pulsar/broker/service/SystemTopicBasedTopicPoliciesService.java
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,7 @@
import org.apache.pulsar.broker.systopic.NamespaceEventsSystemTopicFactory;
import org.apache.pulsar.broker.systopic.SystemTopicClient;
import org.apache.pulsar.client.api.Message;
import org.apache.pulsar.client.api.MessageId;
import org.apache.pulsar.client.api.PulsarClientException;
import org.apache.pulsar.common.events.ActionType;
import org.apache.pulsar.common.events.EventType;
Expand Down Expand Up @@ -95,19 +96,11 @@ private CompletableFuture<Void> sendTopicPolicyEvent(TopicName topicName, Action
if (ex != null) {
result.completeExceptionally(ex);
} else {
writer.writeAsync(
PulsarEvent.builder()
.actionType(actionType)
.eventType(EventType.TOPIC_POLICY)
.topicPoliciesEvent(
TopicPoliciesEvent.builder()
.domain(topicName.getDomain().toString())
.tenant(topicName.getTenant())
.namespace(topicName.getNamespaceObject().getLocalName())
.topic(TopicName.get(topicName.getPartitionedTopicName()).getLocalName())
.policies(policies)
.build())
.build()).whenComplete(((messageId, e) -> {
PulsarEvent event = getPulsarEvent(topicName, actionType, policies);
CompletableFuture<MessageId> actionFuture =
ActionType.DELETE.equals(actionType)
? writer.deleteAsync(event) : writer.writeAsync(event);
actionFuture.whenComplete(((messageId, e) -> {
if (e != null) {
result.completeExceptionally(e);
} else {
Expand All @@ -133,6 +126,21 @@ private CompletableFuture<Void> sendTopicPolicyEvent(TopicName topicName, Action
return result;
}

private PulsarEvent getPulsarEvent(TopicName topicName, ActionType actionType, TopicPolicies policies) {
return PulsarEvent.builder()
.actionType(actionType)
.eventType(EventType.TOPIC_POLICY)
.topicPoliciesEvent(
TopicPoliciesEvent.builder()
.domain(topicName.getDomain().toString())
.tenant(topicName.getTenant())
.namespace(topicName.getNamespaceObject().getLocalName())
.topic(TopicName.get(topicName.getPartitionedTopicName()).getLocalName())
.policies(policies)
.build())
.build();
}

private void notifyListener(Message<PulsarEvent> msg) {
if (!EventType.TOPIC_POLICY.equals(msg.getValue().getEventType())) {
return;
Expand Down Expand Up @@ -316,6 +324,11 @@ private void readMorePolicies(SystemTopicClient.Reader<PulsarEvent> reader) {
}

private void refreshTopicPoliciesCache(Message<PulsarEvent> msg) {
// delete policies
if (msg.getValue() == null) {
policiesCache.remove(TopicName.get(TopicName.get(msg.getKey()).getPartitionedTopicName()));
return;
}
if (EventType.TOPIC_POLICY.equals(msg.getValue().getEventType())) {
TopicPoliciesEvent event = msg.getValue().getTopicPoliciesEvent();
TopicName topicName =
Expand All @@ -330,9 +343,6 @@ private void refreshTopicPoliciesCache(Message<PulsarEvent> msg) {
case UPDATE:
policiesCache.put(topicName, event.getPolicies());
break;
case DELETE:
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what about old data present in existing clusters ?

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Good catch, maybe we could call the delete method to publish a message with a null value in branch DELETE?

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Indeed, for the compatibility, this code cannot be deleted now, I will add a comment here.
But Topic's existing old data seems to need to provide additional tools to delete it.

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When recovering the topic policies, the reader will read messages from the earliest position, it could read the DELETE type Pulsar event, does it handle the DELETE event messages at this time?

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I added a compatibility adaptation

policiesCache.remove(topicName);
break;
case NONE:
break;
default:
Expand Down
19 changes: 19 additions & 0 deletions pulsar-broker/src/main/java/org/apache/pulsar/broker/systopic/SystemTopicClient.java
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Expand Up @@ -105,6 +105,25 @@ interface Writer<T> {
*/
CompletableFuture<MessageId> writeAsync(T t);

/**
* Delete event in the system topic.
* @param t pulsar event
* @return message id
* @throws PulsarClientException exception while write event cause
*/
default MessageId delete(T t) throws PulsarClientException {
throw new UnsupportedOperationException("Unsupported operation");
}

/**
* Async delete event in the system topic.
* @param t pulsar event
* @return message id future
*/
default CompletableFuture<MessageId> deleteAsync(T t) {
throw new UnsupportedOperationException("Unsupported operation");
}

/**
* Close the system topic writer.
*/
Expand Down
19 changes: 19 additions & 0 deletions ...roker/src/main/java/org/apache/pulsar/broker/systopic/TopicPoliciesSystemTopicClient.java
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,7 @@
import org.apache.pulsar.client.api.PulsarClient;
import org.apache.pulsar.client.api.PulsarClientException;
import org.apache.pulsar.client.api.Schema;
import org.apache.pulsar.common.events.ActionType;
import org.apache.pulsar.common.events.PulsarEvent;
import org.apache.pulsar.common.naming.TopicName;
import org.slf4j.Logger;
Expand Down Expand Up @@ -88,6 +89,18 @@ public CompletableFuture<MessageId> writeAsync(PulsarEvent event) {
return producer.newMessage().key(getEventKey(event)).value(event).sendAsync();
}

@Override
public MessageId delete(PulsarEvent event) throws PulsarClientException {
validateActionType(event);
return producer.newMessage().key(getEventKey(event)).value(null).send();
}

@Override
public CompletableFuture<MessageId> deleteAsync(PulsarEvent event) {
validateActionType(event);
return producer.newMessage().key(getEventKey(event)).value(null).sendAsync();
}

private String getEventKey(PulsarEvent event) {
return TopicName.get(event.getTopicPoliciesEvent().getDomain(),
event.getTopicPoliciesEvent().getTenant(),
Expand Down Expand Up @@ -115,6 +128,12 @@ public SystemTopicClient<PulsarEvent> getSystemTopicClient() {
}
}

private static void validateActionType(PulsarEvent event) {
if (event == null || !ActionType.DELETE.equals(event.getActionType())) {
throw new UnsupportedOperationException("The only supported ActionType is DELETE");
}
}

private static class TopicPolicyReader implements Reader<PulsarEvent> {

private final org.apache.pulsar.client.api.Reader<PulsarEvent> reader;
Expand Down
79 changes: 79 additions & 0 deletions pulsar-broker/src/test/java/org/apache/pulsar/broker/admin/TopicPoliciesTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,7 @@
import java.util.Optional;
import java.util.Set;
import java.util.UUID;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;
import lombok.Cleanup;
import lombok.extern.slf4j.Slf4j;
Expand All @@ -61,6 +62,7 @@
import org.apache.pulsar.client.api.SubscriptionMode;
import org.apache.pulsar.client.api.SubscriptionType;
import org.apache.pulsar.common.api.proto.CommandSubscribe;
import org.apache.pulsar.common.events.EventsTopicNames;
import org.apache.pulsar.common.naming.TopicName;
import org.apache.pulsar.common.policies.data.BacklogQuota;
import org.apache.pulsar.common.policies.data.ClusterData;
Expand Down Expand Up @@ -2519,6 +2521,83 @@ public void testPolicyIsDeleteTogetherManually() throws Exception {
.isNull());
}

@Test
public void testPoliciesCanBeDeletedWithTopic() throws Exception {
final String topic = testTopic + UUID.randomUUID();
final String topic2 = testTopic + UUID.randomUUID();
pulsarClient.newProducer().topic(topic).create().close();
pulsarClient.newProducer().topic(topic2).create().close();

Awaitility.await().untilAsserted(() -> {
Assertions.assertThat(pulsar.getTopicPoliciesService().getTopicPolicies(TopicName.get(topic))).isNull();
Assertions.assertThat(pulsar.getTopicPoliciesService().getTopicPolicies(TopicName.get(topic2))).isNull();
});
// Init Topic Policies. Send 4 messages in a row, there should be only 2 messages left after compression
admin.topics().setMaxConsumersPerSubscription(topic, 1);
admin.topics().setMaxConsumersPerSubscription(topic2, 2);
admin.topics().setMaxConsumersPerSubscription(topic, 3);
admin.topics().setMaxConsumersPerSubscription(topic2, 4);
Awaitility.await().untilAsserted(() -> {
Assertions.assertThat(pulsar.getTopicPoliciesService().getTopicPolicies(TopicName.get(topic))).isNotNull();
Assertions.assertThat(pulsar.getTopicPoliciesService().getTopicPolicies(TopicName.get(topic2))).isNotNull();
});
String topicPoliciesTopic = "persistent://" + myNamespace + "/" + EventsTopicNames.NAMESPACE_EVENTS_LOCAL_NAME;
PersistentTopic persistentTopic =
(PersistentTopic) pulsar.getBrokerService().getTopicIfExists(topicPoliciesTopic).get().get();
// Trigger compaction and make sure it is finished.
persistentTopic.triggerCompaction();
Field field = PersistentTopic.class.getDeclaredField("currentCompaction");
field.setAccessible(true);
CompletableFuture<Long> future = (CompletableFuture<Long>)field.get(persistentTopic);
Awaitility.await().untilAsserted(() -> assertTrue(future.isDone()));

Consumer consumer = pulsarClient.newConsumer()
.subscriptionInitialPosition(SubscriptionInitialPosition.Earliest)
.readCompacted(true)
.topic(topicPoliciesTopic).subscriptionName("sub").subscribe();
int count = 0;
while (true) {
Message message = consumer.receive(1, TimeUnit.SECONDS);
if (message != null) {
count++;
consumer.acknowledge(message);
} else {
break;
}
}
consumer.close();
assertEquals(count, 2);

// Delete topic, there should be only 1 message left after compression
admin.topics().delete(topic, true);

Awaitility.await().untilAsserted(() ->
assertNull(pulsar.getTopicPoliciesService().getTopicPolicies(TopicName.get(topic))));
persistentTopic.triggerCompaction();
field = PersistentTopic.class.getDeclaredField("currentCompaction");
field.setAccessible(true);
CompletableFuture<Long> future2 = (CompletableFuture<Long>)field.get(persistentTopic);
Awaitility.await().untilAsserted(() -> assertTrue(future2.isDone()));

consumer = pulsarClient.newConsumer()
.subscriptionInitialPosition(SubscriptionInitialPosition.Earliest)
.readCompacted(true)
.topic(topicPoliciesTopic).subscriptionName("sub").subscribe();
count = 0;
while (true) {
Message message = consumer.receive(1, TimeUnit.SECONDS);
if (message != null) {
count++;
consumer.acknowledge(message);
} else {
break;
}
}
consumer.close();
assertEquals(count, 1);

}

@Test
public void testPolicyIsDeleteTogetherAutomatically() throws Exception {
final String topic = testTopic + UUID.randomUUID();
Expand Down