liangyepianzhou commented on a change in pull request #12219:
URL: https://github.com/apache/pulsar/pull/12219#discussion_r728010473



##########
File path: 
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/PersistentTopic.java
##########
@@ -2981,12 +2981,16 @@ public void publishTxnMessage(TxnID txnID, ByteBuf 
headersAndPayload, PublishCon
                                     // Message has been successfully persisted
                                     
messageDeduplication.recordMessagePersisted(publishContext,
                                             (PositionImpl) position);
-                                    publishContext.completed(null, 
((PositionImpl) position).getLedgerId(),
-                                            ((PositionImpl) 
position).getEntryId());
+                                    publishContext.completed(null, 
position.getLedgerId(),
+                                            position.getEntryId());
 
                                     decrementPendingWriteOpsAndCheck();
                                 })
                                 .exceptionally(throwable -> {
+                                    throwable = throwable.getCause();
+                                    if (!(throwable instanceof 
ManagedLedgerException)){
+                                        throwable = new 
ManagedLedgerException(throwable);
+                                    }

Review comment:
       The methoda of ddFailed() needs to accept ManagedLedgerException as a 
parameter, and transaction will return exceptions that are not 
ManagedLedgerException in two places. So unified packaging here

##########
File path: 
pulsar-broker/src/main/java/org/apache/pulsar/broker/transaction/buffer/exceptions/TransactionBufferStatusException.java
##########
@@ -0,0 +1,34 @@
+/**
+ * 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.broker.transaction.buffer.exceptions;
+
+
+import 
org.apache.pulsar.broker.transaction.buffer.impl.TopicTransactionBufferState;
+
+public class TransactionBufferStatusException extends 
TransactionBufferException{

Review comment:
       TransactionBufferException has ten similar implementation classes. If 
you and @congbobo184 agree with this, I can mention another PR to do this later.

##########
File path: 
pulsar-broker/src/main/java/org/apache/pulsar/broker/transaction/buffer/impl/TopicTransactionBuffer.java
##########
@@ -398,13 +451,14 @@ public void 
syncMaxReadPositionForNormalPublish(PositionImpl position) {
         synchronized (TopicTransactionBuffer.this) {
             if (ongoingTxns.isEmpty()) {
                 maxReadPosition = position;
+                changeMaxReadPositionAndAddAbortTimes.incrementAndGet();
             }
         }
     }
 
     @Override
     public PositionImpl getMaxReadPosition() {
-        if (checkIfReady()) {
+        if (checkIfReady() || checkIfUnused()) {

Review comment:
       If it is unused, it will return lastConfirmed

##########
File path: 
pulsar-broker/src/main/java/org/apache/pulsar/broker/transaction/buffer/impl/TopicTransactionBufferState.java
##########
@@ -32,7 +32,8 @@
         None,
         Initializing,
         Ready,
-        Close
+        Close,
+        Unused

Review comment:
       Thx, I have adopted your suggestion. 

##########
File path: 
pulsar-broker/src/main/java/org/apache/pulsar/broker/transaction/buffer/impl/TopicTransactionBufferState.java
##########
@@ -32,7 +32,8 @@
         None,
         Initializing,
         Ready,
-        Close
+        Close,
+        Unused

Review comment:
       Which will be submitted together in this update

##########
File path: 
pulsar-broker/src/main/java/org/apache/pulsar/broker/transaction/buffer/impl/TopicTransactionBuffer.java
##########
@@ -163,6 +174,34 @@ public void recoverExceptionally(Exception e) {
     @Override
     public CompletableFuture<Position> appendBufferToTxn(TxnID txnId, long 
sequenceId, ByteBuf buffer) {
         CompletableFuture<Position> completableFuture = new 
CompletableFuture<>();
+        if (checkIfReady()){
+            addTxnEntry(completableFuture, txnId, buffer);
+        } else {
+            if (checkIfUnused() && changeToInitializingStateFromUnused()){
+                //`PulsarDecoder` will release this buffer  in `finally` and 
`takeSnapshot` is asynchronous
+                buffer.retain();
+                takeSnapshot().thenAccept(ignore -> {
+                    changeToReadyState();

Review comment:
       In order to ensure the orderliness of the messages and no ambiguity, we 
hope that the first transaction will directly fail, and then the client will 
resend the requests.

##########
File path: 
pulsar-broker/src/main/java/org/apache/pulsar/broker/transaction/buffer/impl/TopicTransactionBuffer.java
##########
@@ -163,6 +174,34 @@ public void recoverExceptionally(Exception e) {
     @Override
     public CompletableFuture<Position> appendBufferToTxn(TxnID txnId, long 
sequenceId, ByteBuf buffer) {
         CompletableFuture<Position> completableFuture = new 
CompletableFuture<>();
+        if (checkIfReady()){
+            addTxnEntry(completableFuture, txnId, buffer);
+        } else {
+            if (checkIfUnused() && changeToInitializingStateFromUnused()){
+                //`PulsarDecoder` will release this buffer  in `finally` and 
`takeSnapshot` is asynchronous
+                buffer.retain();
+                takeSnapshot().thenAccept(ignore -> {
+                    changeToReadyState();
+                    buffer.release();
+                    timer.newTimeout(TopicTransactionBuffer.this,
+                            takeSnapshotIntervalTime, TimeUnit.MILLISECONDS);
+                    log.info("Topic {} take snapshot successfully when uses 
TransactionBuffer at the first time",
+                            this.topic.getName());
+                }).exceptionally(exception -> {
+                    changeToUnUsedState();
+                    buffer.release();
+                    log.error("Topic {} fail to takeSnapshot before adding the 
first message with transaction",
+                            this.topic.getName(), exception);
+                    return null;
+                });
+            }
+        completableFuture.completeExceptionally(new 
TransactionBufferStatusException(this.topic.getName(),

Review comment:
       If the state of TransactionBuffer is not Ready, we hope so

##########
File path: 
pulsar-broker/src/main/java/org/apache/pulsar/broker/transaction/buffer/impl/TopicTransactionBufferState.java
##########
@@ -32,7 +32,8 @@
         None,
         Initializing,
         Ready,
-        Close
+        Close,
+        Unused

Review comment:
       Which will be submitted together in this update

##########
File path: 
pulsar-broker/src/main/java/org/apache/pulsar/broker/transaction/buffer/impl/TopicTransactionBufferState.java
##########
@@ -32,7 +32,8 @@
         None,
         Initializing,
         Ready,
-        Close
+        Close,
+        Unused

Review comment:
       Thx, I have adopted your suggestion which will be submitted together in 
this update.  




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