[fix][broker] Fix potential to add duplicated consumer #15051

poorbarcode · 2022-04-06T16:49:34Z

Motivation

It's because of this issue #13787.
Then diving into the codes, I find that if the client tries to subscribe multiple times over a short period of time, it is possible to have more than one consumer at the same dispatcher. just like below:

for ( long requestId = 1; i < 5; i++ ){
  ByteBuf request1 = Commands.newSubscribe(topic, subscription, consumerId, requestId , getSubType(),
          priorityLevel, consumerName, isDurable, startMessageIdData, metadata, readCompacted,
          conf.isReplicateSubscriptionState(),
          InitialPosition.valueOf(subscriptionInitialPosition.getValue()),
          startMessageRollbackDuration, si, createTopicIfDoesNotExist, conf.getKeySharedPolicy(),
          // Use the current epoch to subscribe.
          conf.getSubscriptionProperties(), CONSUMER_EPOCH.get(this));
  cnx.sendRequestWithId(request1, requestId).thenRun(() -> {});
}

The root cause is below snippet:

pulsar/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/ServerCnx.java

Lines 994 to 1021 in c2c05c4

    
           if (existingConsumerFuture != null) { 
        
               if (existingConsumerFuture.isDone() && !existingConsumerFuture.isCompletedExceptionally()) { 
        
                   Consumer consumer = existingConsumerFuture.getNow(null); 
        
                   log.info("[{}] Consumer with the same id is already created:" 
        
                            + " consumerId={}, consumer={}", 
        
                            remoteAddress, consumerId, consumer); 
        
                   commandSender.sendSuccessResponse(requestId); 
        
                   return null; 
        
               } else { 
        
                   // There was an early request to create a consumer with same consumerId. This can happen 
        
                   // when 
        
                   // client timeout is lower the broker timeouts. We need to wait until the previous 
        
                   // consumer 
        
                   // creation request either complete or fails. 
        
                   log.warn("[{}][{}][{}] Consumer with id is already present on the connection," 
        
                            + " consumerId={}", remoteAddress, topicName, subscriptionName, consumerId); 
        
                   ServerError error = null; 
        
                   if (!existingConsumerFuture.isDone()) { 
        
                       error = ServerError.ServiceNotReady; 
        
                   } else { 
        
                       error = getErrorCode(existingConsumerFuture); 
        
                       consumers.remove(consumerId, existingConsumerFuture); 
        
                   } 
        
                   commandSender.sendErrorResponse(requestId, error, 
        
                           "Consumer is already present on the connection"); 
        
                   return null; 
        
               } 
        
           }

If the consumer1 comes and is not done, then the same consumer2(it's the same with consumer1) comes, it may remove the prior consumer1(line 1015), but consumer1 add to subscription success in the end, Then the same cusumer3 comes, and it succeed, and will cause the same consumer to add duplicated.

The right way to remove consumer (line 1015) is when the existingConsumerFuture is completedExceptionally.

Even though the Java client couldn't occur the above behavior, other clients may not. So it's better to handle subscribe correctly on the broker side.

Modifications

Modify the process execution sequence to improve stability

Verifying this change

Make sure that the change passes the CI checks.

Documentation

no-need-doc
doc-not-needed

pulsar-broker/src/main/java/org/apache/pulsar/broker/service/ServerCnx.java

RobertIndie

Seems that this PR only enhances the exception handling. Could you provide more information on how this PR fixed the duplicated consumer issue?

pulsar-broker/src/main/java/org/apache/pulsar/broker/service/ServerCnx.java

RobertIndie

Thanks for your explanation. LGTM

poorbarcode · 2022-04-08T02:43:35Z

Seems that this PR only enhances the exception handling. Could you provide more information on how this PR fixed the duplicated consumer issue?

The key point for the problem was "possibly delete a running CompletableFuture", the logic of the original code was not rigorous enough. this PR solved it.

lhotari

Good catch.

Please improve the error message.

pulsar-broker/src/main/java/org/apache/pulsar/broker/service/ServerCnx.java

lhotari · 2022-04-08T04:30:47Z

Seems that this PR only enhances the exception handling. Could you provide more information on how this PR fixed the duplicated consumer issue?

The key point for the problem was "possibly delete a running CompletableFuture", the logic of the original code was not rigorous enough. this PR solved it.

I was wondering about the same thing whether this is just a refactoring. This does fix a race condition in providing the error message. It's possible the the CompletableFuture completes after it has been checked in the first place.

                    if (existingConsumerFuture.isDone() && !existingConsumerFuture.isCompletedExceptionally()) {

In that case, the old code might have provided a wrong error code and removed the future.

                        if (!existingConsumerFuture.isDone()) {
                            error = ServerError.ServiceNotReady;
                        } else {
                            error = getErrorCode(existingConsumerFuture);
                            consumers.remove(consumerId, existingConsumerFuture);
                        }

@poorbarcode I don't think that this PR prevents duplicated consumers. Could you explain how it achieves that?

poorbarcode · 2022-04-08T04:42:20Z

Seems that this PR only enhances the exception handling. Could you provide more information on how this PR fixed the duplicated consumer issue?

The key point for the problem was "possibly delete a running CompletableFuture", the logic of the original code was not rigorous enough. this PR solved it.

I was wondering about the same thing whether this is just a refactoring. This does fix a race condition in providing the error message. It's possible the the CompletableFuture completes after it has been checked. In that case, the old code might have provided a wrong error code.

@poorbarcode I don't think that this PR prevents duplicated consumers. Could you explain how it achieves that?

@lhotari @RobertIndie

This PR fixed that : When things go wrong with consumer operations, duplicated consumers registry.

You can reproduce the problem like this (The code is in the attachment):

Override ConsumerImpl.java by acttachment file. These change will Execute command-Subscribe more times in a short time
Overide ServerCnx.java by acttachment file. These change controls the execution order of multiple threads, increasing the probability of problems to 100%
Add SubscribeProcessController.java with attachment file. It is multi thread execution-order-controller

ConsumerImpl.java.txt
ServerCnx.java.txt
SubscribeProcessController.java.txt

lhotari · 2022-04-08T05:42:46Z

@poorbarcode I don't think that this PR prevents duplicated consumers. Could you explain how it achieves that?

@lhotari @RobertIndie

This PR fixed that : When things go wrong with consumer operations, duplicated consumers registry.

You can reproduce the problem like this (The code is in the attachment):

I'm sorry I didn't explain clearly what I meant. Please explain how this PR prevents adding duplicate consumers. I don't see a chance in behavior for that particular detail. I do acknowledge that this PR makes sense to fix a race where the consumer gets removed when it shouldn't. (I explained that in my previous comment). However, I don't see how this prevents adding of duplicate consumers which appears in #14970.

poorbarcode · 2022-04-08T06:03:08Z

@poorbarcode I don't think that this PR prevents duplicated consumers. Could you explain how it achieves that?

@lhotari @RobertIndie
This PR fixed that : When things go wrong with consumer operations, duplicated consumers registry.
You can reproduce the problem like this (The code is in the attachment):

I'm sorry I didn't explain clearly what I meant. Please explain how this PR prevents adding duplicate consumers. I don't see a chance in behavior for that particular detail. I do acknowledge that this PR makes sense to fix a race where the consumer gets removed when it shouldn't. (I explained that in my previous comment). However, I don't see how this prevents adding of duplicate consumers which appears in #14970.

It's just a guess at one of the possibilities for "Why #14970 problem happend".

Because there has only one instance in consumerSet, so two consumer instance has same address & consumerId, so there are only two possibilities:

Consumer restart use same SocketAddress.
One consumer instance execute command-subscribe more times in a short time.

After code-review on the second possibility, finds possibility-case and fixed it.

Maybe there are other problems that can reproduce #14970 problem

lhotari · 2022-04-08T06:42:46Z

It's just a guess at one of the possibilities for "Why #14970 problem happend".

Because there has only one instance in consumerSet, so two consumer instance has same address & consumerId, so there are only two possibilities:

Consumer restart use same SocketAddress.

One consumer instance execute command-subscribe more times in a short time.

After code-review on the second possibility, finds possibility-case and fixed it.

Maybe there are other problems that can reproduce #14970 problem

I don't think that this PR fixes that issue. ServerCnx is tied to a single TCP/IP connection and even without the changes in this PR, duplicates on the same connection are prevented.

As mentioned before, this PR is useful since it fixes a race condition and returns ServiceNotReady in the case that the future completes after the check has been made (as explained in #15051 (comment)).

lhotari · 2022-04-08T06:45:29Z

poorbarcode reopened this 1 hour ago

/pulsarbot run-failure-checks

Please be aware of this: apache/pulsar-test-infra#28 (comment)

There shouldn't be a need to close & re-open the PR to rerun failed jobs. Please read the above explanations to understand what some failures are about. They don't need to clear off to be able to merge the PR.

poorbarcode · 2022-04-08T06:46:42Z

/pulsarbot run-failure-checks

Please be aware of this: apache/pulsar-test-infra#28 (comment)

There shouldn't be a need to close & re-open the PR to rerun failed jobs. Please read the above explanations to understand what some failures are about. They don't need to clear off to be able to merge the PR.

Sorry. I click on the wrong button

poorbarcode · 2022-04-08T06:50:14Z

I don't think that this PR fixes that issue. ServerCnx is tied to a single TCP/IP connection and even without the changes in this PR, duplicates on the same connection are prevented.

@lhotari
Maybe you ignored the async-execute-code in ServerCnx.handleSubscribe. if without async-execute, you are right: "all task will run at same eventLoop". So I still think I'm right: "this PR fixed #14970 problem, a part of possible"

congbobo184

good catch! cloud you please add a test for test, prevent it from being changed back later

gaoran10

LGTM. Great work! Please add a unit test to prevent regression.

poorbarcode · 2022-04-29T04:23:25Z

/pulsarbot run-failure-checks

poorbarcode · 2022-05-17T13:20:12Z

/pulsarbot run-failure-checks

poorbarcode · 2022-05-17T13:47:25Z

@codelipenghui Could you take a look ?

poorbarcode · 2022-05-18T01:34:41Z

/pulsarbot run-failure-checks

It's because of this issue #13787. Then diving into the codes, I find that if the client tries to subscribe multiple times over a short period of time, it is possible to have more than one consumer at the same dispatcher. just like below: ``` for ( long requestId = 1; i < 5; i++ ){ ByteBuf request1 = Commands.newSubscribe(topic, subscription, consumerId, requestId , getSubType(), priorityLevel, consumerName, isDurable, startMessageIdData, metadata, readCompacted, conf.isReplicateSubscriptionState(), InitialPosition.valueOf(subscriptionInitialPosition.getValue()), startMessageRollbackDuration, si, createTopicIfDoesNotExist, conf.getKeySharedPolicy(), // Use the current epoch to subscribe. conf.getSubscriptionProperties(), CONSUMER_EPOCH.get(this)); cnx.sendRequestWithId(request1, requestId).thenRun(() -> {}); } ``` The root cause is below snippet: https://github.com/apache/pulsar/blob/c2c05c49aff1ebc7b2b7a1d5bd547c33211e4479/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/ServerCnx.java#L994-L1021 If the consumer1 comes and is not done, then the same consumer2(it's the same with consumer1) comes, it may remove the prior consumer1(line 1015), but consumer1 add to subscription success in the end, Then the same cusumer3 comes, and it succeed, and will cause the same consumer to add duplicated. The right way to remove consumer (line 1015) is when the `existingConsumerFuture` is completedExceptionally. Even though the Java client couldn't occur the above behavior, other clients may not. So it's better to handle `subscribe` correctly on the broker side. Modify the process execution sequence to improve stability (cherry picked from commit 7bf495a)

It's because of this issue apache#13787. Then diving into the codes, I find that if the client tries to subscribe multiple times over a short period of time, it is possible to have more than one consumer at the same dispatcher. just like below: ``` for ( long requestId = 1; i < 5; i++ ){ ByteBuf request1 = Commands.newSubscribe(topic, subscription, consumerId, requestId , getSubType(), priorityLevel, consumerName, isDurable, startMessageIdData, metadata, readCompacted, conf.isReplicateSubscriptionState(), InitialPosition.valueOf(subscriptionInitialPosition.getValue()), startMessageRollbackDuration, si, createTopicIfDoesNotExist, conf.getKeySharedPolicy(), // Use the current epoch to subscribe. conf.getSubscriptionProperties(), CONSUMER_EPOCH.get(this)); cnx.sendRequestWithId(request1, requestId).thenRun(() -> {}); } ``` The root cause is below snippet: https://github.com/apache/pulsar/blob/c2c05c49aff1ebc7b2b7a1d5bd547c33211e4479/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/ServerCnx.java#L994-L1021 If the consumer1 comes and is not done, then the same consumer2(it's the same with consumer1) comes, it may remove the prior consumer1(line 1015), but consumer1 add to subscription success in the end, Then the same cusumer3 comes, and it succeed, and will cause the same consumer to add duplicated. The right way to remove consumer (line 1015) is when the `existingConsumerFuture` is completedExceptionally. Even though the Java client couldn't occur the above behavior, other clients may not. So it's better to handle `subscribe` correctly on the broker side. Modify the process execution sequence to improve stability (cherry picked from commit 7bf495a) (cherry picked from commit 9dead56)

### Motivation It's because of this issue #13787. Then diving into the codes, I find that if the client tries to subscribe multiple times over a short period of time, it is possible to have more than one consumer at the same dispatcher. just like below: ``` for ( long requestId = 1; i < 5; i++ ){ ByteBuf request1 = Commands.newSubscribe(topic, subscription, consumerId, requestId , getSubType(), priorityLevel, consumerName, isDurable, startMessageIdData, metadata, readCompacted, conf.isReplicateSubscriptionState(), InitialPosition.valueOf(subscriptionInitialPosition.getValue()), startMessageRollbackDuration, si, createTopicIfDoesNotExist, conf.getKeySharedPolicy(), // Use the current epoch to subscribe. conf.getSubscriptionProperties(), CONSUMER_EPOCH.get(this)); cnx.sendRequestWithId(request1, requestId).thenRun(() -> {}); } ``` The root cause is below snippet: https://github.com/apache/pulsar/blob/c2c05c49aff1ebc7b2b7a1d5bd547c33211e4479/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/ServerCnx.java#L994-L1021 If the consumer1 comes and is not done, then the same consumer2(it's the same with consumer1) comes, it may remove the prior consumer1(line 1015), but consumer1 add to subscription success in the end, Then the same cusumer3 comes, and it succeed, and will cause the same consumer to add duplicated. The right way to remove consumer (line 1015) is when the `existingConsumerFuture` is completedExceptionally. Even though the Java client couldn't occur the above behavior, other clients may not. So it's better to handle `subscribe` correctly on the broker side. ### Modifications Modify the process execution sequence to improve stability (cherry picked from commit 7bf495a)

BewareMyPower · 2022-07-27T03:45:31Z

@poorbarcode Could you migrate this PR to branch-2.8? It looks like the Mockito version of branch-2.8 doesn't support the creation of static mocks.

org.mockito.exceptions.base.MockitoException: 
The used MockMaker PowerMockMaker does not support the creation of static mocks

Mockito's inline mock maker supports static mocks based on the Instrumentation API.
You can simply enable this mock mode, by placing the 'mockito-inline' artifact where you are currently using 'mockito-core'.
Note that Mockito's inline mock maker is not supported on Android.

	at org.apache.pulsar.broker.service.ServerCnxTest.testNeverDelayConsumerFutureWhenNotFail(ServerCnxTest.java:1921)

poorbarcode · 2022-07-27T04:24:02Z

@poorbarcode Could you migrate this PR to branch-2.8? It looks like the Mockito version of branch-2.8 doesn't support the creation of static mocks.

ok. see #16826

…16826) ### Motivation see #15051 There have conflicts when cherry-picking #15051 PR (branch 2.8 has no `mock static` support), so I created a separate PR to fix branch-2.8 ### Modifications Swap the execution order of duplicate validation and maximum validation

Squash merge branch 'fix_mutiple_consumers' into '2.8.1' Fixes #<xyz> ### Motivation --bug=100319271 修复Consumer重名问题 chery pick apache#15051 TAPD: --bug=100319271

github-actions bot assigned poorbarcode Apr 6, 2022

github-actions bot added the doc-not-needed Your PR changes do not impact docs label Apr 6, 2022

Technoboy- changed the title ~~[fix] [broker] make ServerCnx.handleSubscribe thread safety~~ [fix] [broker] Fix ServerCnx.handleSubscribe add duplicated consumer issue Apr 7, 2022

Technoboy- changed the title ~~[fix] [broker] Fix ServerCnx.handleSubscribe add duplicated consumer issue~~ [fix] [broker] Fix ServerCnx.handleSubscribe potentially add duplicated consumer issue Apr 7, 2022

Technoboy- changed the title ~~[fix] [broker] Fix ServerCnx.handleSubscribe potentially add duplicated consumer issue~~ [fix] [broker] Fix ServerCnx.handleSubscribe add potentially duplicated consumer issue Apr 7, 2022

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poorbarcode changed the title ~~[fix] [broker] Fix ServerCnx.handleSubscribe add potentially duplicated consumer issue~~ [fix] [broker] Fix potential risk: Command-Subscribe add duplicated consumer Apr 7, 2022

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RobertIndie added type/bug The PR fixed a bug or issue reported a bug area/broker labels Apr 7, 2022

Technoboy- changed the title ~~[fix] [broker] Fix potential risk: Command-Subscribe add duplicated consumer~~ [fix][broker] Fix potential to add duplicated consumer Apr 7, 2022

poorbarcode force-pushed the fix/15050 branch from 2d8351a to f31b5e8 Compare April 7, 2022 13:17

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Fix potential to add duplicated consumer

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poorbarcode force-pushed the fix/15050 branch from a449f14 to a0819d6 Compare May 16, 2022 03:05

congbobo184 merged commit 7bf495a into apache:master May 18, 2022

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[branch-2.9] Fix cherry-pick issue with #15051 (#15800)

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Broker registered the same consumers #15050

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[Java Client] Send CloseConsumer on client timeout #16616

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[fix][broker][branch-2.8] Fix potential to add duplicated consumer #16826

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[Bug] [broker] subscription of topic in a permanent fence state and consumerList remain offline consumer #20576

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[fix][broker] Fix potential to add duplicated consumer #15051

[fix][broker] Fix potential to add duplicated consumer #15051

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	if (existingConsumerFuture != null) {
	if (existingConsumerFuture.isDone() && !existingConsumerFuture.isCompletedExceptionally()) {
	Consumer consumer = existingConsumerFuture.getNow(null);
	log.info("[{}] Consumer with the same id is already created:"
	+ " consumerId={}, consumer={}",
	remoteAddress, consumerId, consumer);
	commandSender.sendSuccessResponse(requestId);
	return null;
	} else {
	// There was an early request to create a consumer with same consumerId. This can happen
	// when
	// client timeout is lower the broker timeouts. We need to wait until the previous
	// consumer
	// creation request either complete or fails.
	log.warn("[{}][{}][{}] Consumer with id is already present on the connection,"
	+ " consumerId={}", remoteAddress, topicName, subscriptionName, consumerId);
	ServerError error = null;
	if (!existingConsumerFuture.isDone()) {
	error = ServerError.ServiceNotReady;
	} else {
	error = getErrorCode(existingConsumerFuture);
	consumers.remove(consumerId, existingConsumerFuture);
	}
	commandSender.sendErrorResponse(requestId, error,
	"Consumer is already present on the connection");
	return null;
	}
	}

[fix][broker] Fix potential to add duplicated consumer #15051

[fix][broker] Fix potential to add duplicated consumer #15051

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