[fix][broker]Transactional messages can never be sent successfully if concurrently taking transaction buffer snapshot #24945

poorbarcode · 2025-11-04T14:48:48Z

Motivation

Issue 1: concurrently initialising transaction buffer snapshot

Before #21406, the snapshot would be taken when the persistent topic is initialising, so no concurrency. After #21406, the transaction buffer snapshot is triggered by publishing messages, so concurrency occurs. #21406 forgot to handle this case, which caused the following errors

2025-11-04T22:44:14,413 - WARN  - [pulsar-io-28-3:PersistentTopic] - [persistent://public/txn/tp-8064cb9f-1f8f-44f1-8bf2-872cc3870973] Failed to persist msg in store: org.apache.pulsar.broker.service.BrokerServiceException$ServiceUnitNotReadyException: Transaction Buffer take first snapshot failed, the current state is: Ready
2025-11-04T22:44:14,413 - INFO  - [pulsar-io-28-3:PersistentTopic] - [persistent://public/txn/tp-8064cb9f-1f8f-44f1-8bf2-872cc3870973] Un-fencing topic...
2025-11-04T22:44:14,414 - INFO  - [pulsar-client-io-96-3:ClientCnx] - [localhost/127.0.0.1:57291] Broker notification of closed producer: 0, assignedBrokerUrl: null, assignedBrokerUrlTls: null
2025-11-04T22:44:14,412 - WARN  - [pulsar-client-io-262-3:ClientCnx] - [id: 0xe9ef6b71, L:/127.0.0.1:57301 - R:localhost/127.0.0.1:57291] Received send error from server: PersistenceError : org.apache.bookkeeper.mledger.ManagedLedgerException: org.apache.pulsar.broker.service.BrokerServiceException$ServiceUnitNotReadyException: Transaction Buffer take first snapshot failed, the current state is: Ready
2025-11-04T22:44:14,412 - WARN  - [pulsar-client-io-262-3:ClientCnx] - [id: 0xe9ef6b71, L:/127.0.0.1:57301 - R:localhost/127.0.0.1:57291] Producer with id 0 not found while handling send error
2025-11-04T22:44:14,413 - INFO  - [pulsar-client-io-96-3:ProducerImpl] - [persistent://public/txn/tp-8064cb9f-1f8f-44f1-8bf2-872cc3870973] [test-0-1] Created producer on cnx [id: 0x2f0343b6, L:/127.0.0.1:57296 - R:localhost/127.0.0.1:57291]
2025-11-04T22:44:14,413 - INFO  - [pulsar-client-io-96-3:ProducerImpl] - [persistent://public/txn/tp-8064cb9f-1f8f-44f1-8bf2-872cc3870973] [test-0-1] Re-Sending 1 messages to server
2025-11-04T22:44:14,413 - INFO  - [broker-topic-workers-OrderedExecutor-8-0:ServerCnx] - [/127.0.0.1:57298] Created new producer: Producer{topic=PersistentTopic{topic=persistent://public/txn/tp-8064cb9f-1f8f-44f1-8bf2-872cc3870973}, client=[id: 0x960ce44f, L:/127.0.0.1:57291 - R:/127.0.0.1:57298] [SR:127.0.0.1, state:Connected], producerName=test-0-3, producerId=0}, role: null
2025-11-04T22:44:14,413 - INFO  - [pulsar-io-28-3:Producer] - Disconnecting producer: Producer{topic=PersistentTopic{topic=persistent://public/txn/tp-8064cb9f-1f8f-44f1-8bf2-872cc3870973}, client=[id: 0x960ce44f, L:/127.0.0.1:57291 - R:/127.0.0.1:57298] [SR:127.0.0.1, state:Connected], producerName=test-0-3, producerId=0}, assignedBrokerLookupData: Optional.empty
2025-11-04T22:44:14,413 - INFO  - [pulsar-io-28-3:Producer] - Disconnecting producer: Producer{topic=PersistentTopic{topic=persistent://public/txn/tp-8064cb9f-1f8f-44f1-8bf2-872cc3870973}, client=[id: 0x039d7a90, L:/127.0.0.1:57291 - R:/127.0.0.1:57296] [SR:127.0.0.1, state:Connected], producerName=test-0-1, producerId=0}, assignedBrokerLookupData: Optional.empty
2025-11-04T22:44:14,413 - WARN  - [pulsar-io-28-3:PersistentTopic] - [persistent://public/txn/tp-8064cb9f-1f8f-44f1-8bf2-872cc3870973] Failed to persist msg in store: org.apache.pulsar.broker.service.BrokerServiceException$ServiceUnitNotReadyException: Transaction Buffer take first snapshot failed, the current state is: Ready
2025-11-04T22:44:14,413 - INFO  - [pulsar-io-28-3:PersistentTopic] - [persistent://public/txn/tp-8064cb9f-1f8f-44f1-8bf2-872cc3870973] Un-fencing topic...
2025-11-04T22:44:14,414 - INFO  - [pulsar-client-io-96-3:ClientCnx] - [localhost/127.0.0.1:57291] Broker notification of closed producer: 0, assignedBrokerUrl: null, assignedBrokerUrlTls: null
2025-11-04T22:44:14,414 - INFO  - [pulsar-client-io-163-3:ProducerImpl] - [persistent://public/txn/tp-8064cb9f-1f8f-44f1-8bf2-872cc3870973] [test-0-3] Created producer on cnx [id: 0xfbd3c65b, L:/127.0.0.1:57298 - R:localhost/127.0.0.1:57291]
2025-11-04T22:44:14,414 - INFO  - [pulsar-client-io-96-3:ConnectionHandler] - [persistent://public/txn/tp-8064cb9f-1f8f-44f1-8bf2-872cc3870973] [test-0-1] Closed connection [id: 0x2f0343b6, L:/127.0.0.1:57296 - R:localhost/127.0.0.1:57291] -- Will try again in 0.1 s, hostUrl: null
2025-11-04T22:44:14,414 - WARN  - [pulsar-client-io-96-3:ClientCnx] - [id: 0x2f0343b6, L:/127.0.0.1:57296 - R:localhost/127.0.0.1:57291] Received send error from server: PersistenceError : org.apache.bookkeeper.mledger.ManagedLedgerException: org.apache.pulsar.broker.service.BrokerServiceException$ServiceUnitNotReadyException: Transaction Buffer take first snapshot failed, the current state is: Ready
2025-11-04T22:44:14,414 - WARN  - [pulsar-client-io-96-3:ClientCnx] - [id: 0x2f0343b6, L:/127.0.0.1:57296 - R:localhost/127.0.0.1:57291] Producer with id 0 not found while handling send error
2025-11-04T22:44:14,414 - INFO  - [pulsar-client-io-163-3:ClientCnx] - [localhost/127.0.0.1:57291] Broker notification of closed producer: 0, assignedBrokerUrl: null, assignedBrokerUrlTls: null

Issue 2: publishing messages before the transaction buffer is recovered.

Before #21406: a wrong variable was used when reconstructing the class, the correct variable should be snapshotAbortedTxnProcessor, but it used publishFuture. See follows:

This issue makes transaction buffer recovery and taking a transaction snapshot execute concurrently.

performance issue 3: the second write request can only be executed after the first response client

There is a variable named publishFuture, the following publishing can only be executed after the previous one is done.

https://github.com/apache/pulsar/pull/21406/files#diff-ecd728301a585f256e8a649b5e65b28c166194477355b3a1eefc198d014c25d3R255-R288

public CompletableFuture<Position> appendBufferToTxn(TxnID txnId, long sequenceId, ByteBuf buffer) {
    CompletableFuture<Position> future = this.publishFuture.thenCompose(ignore -> {
        internalAppendBufferToTxn(txnId, buffer);
    });
    this.publishFuture = future;
    return future;
}

Modifications

Fix the two issues
Improve performance issue that was described in Motivation-3

Documentation

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doc-complete

Matching PR in forked repository

PR in forked repository: x

…currently executed transaction buffer snaoshot

lhotari · 2025-11-04T15:45:43Z

Checkstyle errors:

Error:  src/main/java/org/apache/pulsar/broker/transaction/buffer/impl/TopicTransactionBuffer.java:[291] (sizes) LineLength: Line is longer than 120 characters (found 126).
Error:  src/test/java/org/apache/pulsar/broker/transaction/TransactionConsumeTest.java:[35,8] (imports) UnusedImports: Unused import: java.util.WeakHashMap.

Please run mvn initialize checkstyle:check to quickly run checkstyle locally.

...r/src/main/java/org/apache/pulsar/broker/transaction/buffer/impl/TopicTransactionBuffer.java

lhotari · 2025-11-04T17:52:33Z

test failures

  Error:  Tests run: 13, Failures: 1, Errors: 0, Skipped: 10, Time elapsed: 41.26 s <<< FAILURE! -- in org.apache.pulsar.broker.transaction.TransactionProduceTest
  Error:  org.apache.pulsar.broker.transaction.TransactionProduceTest.produceAndAbortTest -- Time elapsed: 1.323 s <<< FAILURE!
  java.lang.AssertionError: Tnx commit failed!
  	at org.testng.Assert.fail(Assert.java:110)
  	at org.apache.pulsar.broker.transaction.TransactionProduceTest.lambda$checkMessageId$0(TransactionProduceTest.java:242)
  	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
  	at org.apache.pulsar.broker.transaction.TransactionProduceTest.checkMessageId(TransactionProduceTest.java:223)
  	at org.apache.pulsar.broker.transaction.TransactionProduceTest.produceTest(TransactionProduceTest.java:140)
  	at org.apache.pulsar.broker.transaction.TransactionProduceTest.produceAndAbortTest(TransactionProduceTest.java:103)
  	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
  	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
  	at org.testng.internal.invokers.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:139)
  	at org.testng.internal.invokers.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:47)
  	at org.testng.internal.invokers.InvokeMethodRunnable.call(InvokeMethodRunnable.java:76)
  	at org.testng.internal.invokers.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
  	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
  	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
  	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
  	at java.base/java.lang.Thread.run(Thread.java:1583)

  Error:  Tests run: 22, Failures: 1, Errors: 0, Skipped: 16, Time elapsed: 62.50 s <<< FAILURE! -- in org.apache.pulsar.broker.transaction.buffer.TopicTransactionBufferTest
  Error:  org.apache.pulsar.broker.transaction.buffer.TopicTransactionBufferTest.testMessagePublishInOrder -- Time elapsed: 0.221 s <<< FAILURE!
  java.lang.AssertionError: expected [0] but found [28]
  	at org.testng.Assert.fail(Assert.java:110)
  	at org.testng.Assert.failNotEquals(Assert.java:1577)
  	at org.testng.Assert.assertEqualsImpl(Assert.java:149)
  	at org.testng.Assert.assertEquals(Assert.java:131)
  	at org.testng.Assert.assertEquals(Assert.java:1418)
  	at org.testng.Assert.assertEquals(Assert.java:1438)
  	at org.apache.pulsar.broker.transaction.buffer.TopicTransactionBufferTest.testMessagePublishInOrder(TopicTransactionBufferTest.java:538)
  	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
  	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
  	at org.testng.internal.invokers.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:139)
  	at org.testng.internal.invokers.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:47)
  	at org.testng.internal.invokers.InvokeMethodRunnable.call(InvokeMethodRunnable.java:76)
  	at org.testng.internal.invokers.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
  	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
  	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
  	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
  	at java.base/java.lang.Thread.run(Thread.java:1583)

  Error:  Tests run: 110, Failures: 1, Errors: 0, Skipped: 106, Time elapsed: 628.6 s <<< FAILURE! -- in org.apache.pulsar.client.impl.TransactionEndToEndTest
  Error:  org.apache.pulsar.client.impl.TransactionEndToEndTest.produceCommitTest[true](3) -- Time elapsed: 300.0 s <<< FAILURE!
  org.testng.internal.thread.ThreadTimeoutException: Method org.apache.pulsar.client.impl.TransactionEndToEndTest.produceCommitTest() didn't finish within the time-out 300000
  	at java.base/jdk.internal.misc.Unsafe.park(Native Method)
  	at java.base/java.util.concurrent.locks.LockSupport.park(LockSupport.java:221)
  	at java.base/java.util.concurrent.CompletableFuture$Signaller.block(CompletableFuture.java:1864)
  	at java.base/java.util.concurrent.ForkJoinPool.unmanagedBlock(ForkJoinPool.java:3780)
  	at java.base/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3725)
  	at java.base/java.util.concurrent.CompletableFuture.waitingGet(CompletableFuture.java:1898)
  	at java.base/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2072)
  	at org.apache.pulsar.client.impl.TransactionEndToEndTest.produceCommitTest(TransactionEndToEndTest.java:349)
  	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
  	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
  	at org.testng.internal.invokers.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:139)
  	at org.testng.internal.invokers.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:47)
  	at org.testng.internal.invokers.InvokeMethodRunnable.call(InvokeMethodRunnable.java:76)
  	at org.testng.internal.invokers.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
  	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
  	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
  	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
  	at java.base/java.lang.Thread.run(Thread.java:1583)

...r/src/main/java/org/apache/pulsar/broker/transaction/buffer/impl/TopicTransactionBuffer.java

codecov-commenter · 2025-11-07T02:38:39Z

Codecov Report

❌ Patch coverage is 68.86792% with 33 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.38%. Comparing base (676ba07) to head (29e8d32).
⚠️ Report is 19 commits behind head on master.

Files with missing lines	Patch %	Lines
...ransaction/buffer/impl/TopicTransactionBuffer.java	69.69%	24 Missing and 6 partials ⚠️
...ction/buffer/impl/TopicTransactionBufferState.java	57.14%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #24945       +/-   ##
=============================================
+ Coverage     38.56%   74.38%   +35.82%     
- Complexity    13262    33673    +20411     
=============================================
  Files          1856     1920       +64     
  Lines        145287   150138     +4851     
  Branches      16877    17414      +537     
=============================================
+ Hits          56025   111687    +55662     
+ Misses        81696    29570    -52126     
- Partials       7566     8881     +1315

Flag	Coverage Δ
inttests	`26.34% <40.56%> (+0.16%)`	⬆️
systests	`22.84% <0.00%> (+0.08%)`	⬆️
unittests	`73.93% <68.86%> (+39.19%)`	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...ction/buffer/impl/TopicTransactionBufferState.java	`88.46% <57.14%> (-2.02%)`	⬇️
...ransaction/buffer/impl/TopicTransactionBuffer.java	`83.48% <69.69%> (+46.14%)`	⬆️

... and 1423 files with indirect coverage changes

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...ain/java/org/apache/pulsar/broker/transaction/buffer/impl/PendingAppendingTxnBufferTask.java

...c/test/java/org/apache/pulsar/broker/transaction/buffer/utils/TransactionBufferTestImpl.java

...r/src/main/java/org/apache/pulsar/broker/transaction/buffer/impl/TopicTransactionBuffer.java

BewareMyPower · 2025-11-10T04:13:12Z

testRefCountWhenAppendBufferToTxn failed, but it should not be a regression, just because the previous exception message is different.

...r/src/main/java/org/apache/pulsar/broker/transaction/buffer/impl/TopicTransactionBuffer.java

… concurrently taking transaction buffer snapshot (#24945) (cherry picked from commit f29ca21)

… concurrently taking transaction buffer snapshot (apache#24945) (cherry picked from commit f29ca21) (cherry picked from commit 85e8b5d)

[fix][broker]Trsaction messages can never be sent successfully if con…

632e225

…currently executed transaction buffer snaoshot

poorbarcode added this to the 4.2.0 milestone Nov 4, 2025

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poorbarcode added type/bug The PR fixed a bug or issue reported a bug ready-to-test release/4.1.2 release/4.0.8 labels Nov 4, 2025

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lhotari changed the title ~~[fix][broker]Trsaction messages can never be sent successfully if concurrently taking transaction buffer snapshot~~ [fix][broker]Transactional messages can never be sent successfully if concurrently taking transaction buffer snapshot Nov 4, 2025

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[fix][broker]Transactional messages can never be sent successfully if…

0a2772c

… concurrently taking transaction buffer snapshot (#24945) (cherry picked from commit f29ca21)

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[fix][broker]Transactional messages can never be sent successfully if…

85e8b5d

… concurrently taking transaction buffer snapshot (#24945) (cherry picked from commit f29ca21)

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[fix][broker]Transactional messages can never be sent successfully if concurrently taking transaction buffer snapshot #24945

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[fix][broker]Transactional messages can never be sent successfully if concurrently taking transaction buffer snapshot #24945

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Motivation

Issue 1: concurrently initialising transaction buffer snapshot

Issue 2: publishing messages before the transaction buffer is recovered.

performance issue 3: the second write request can only be executed after the first response client

Modifications

Documentation

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