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[Transaction] Support consume transaction messages. (apache#7781)
Master Issue: apache#2664 Fix https://github.com/streamnative/pulsar/issues/1304 ### Motivation Currently, the consumer can't receive transaction messages. ### Modifications Support process the commit marker in the topic partition and fetch transaction messages from TransactionBuffer.
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140 changes: 140 additions & 0 deletions
140
...r-broker/src/main/java/org/apache/pulsar/broker/service/persistent/TransactionReader.java
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| @@ -0,0 +1,140 @@ | ||
| /** | ||
| * 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.service.persistent; | ||
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|
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| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.concurrent.CompletableFuture; | ||
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| import lombok.extern.slf4j.Slf4j; | ||
| import org.apache.bookkeeper.mledger.AsyncCallbacks; | ||
| import org.apache.bookkeeper.mledger.Entry; | ||
| import org.apache.bookkeeper.mledger.ManagedLedgerException; | ||
| import org.apache.pulsar.broker.service.AbstractBaseDispatcher; | ||
| import org.apache.pulsar.broker.transaction.buffer.TransactionBuffer; | ||
| import org.apache.pulsar.broker.transaction.buffer.TransactionBufferReader; | ||
| import org.apache.pulsar.client.api.transaction.TxnID; | ||
|
|
||
| /** | ||
| * Used to read transaction messages for dispatcher. | ||
| */ | ||
| @Slf4j | ||
| public class TransactionReader { | ||
|
|
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| private final AbstractBaseDispatcher dispatcher; | ||
| private volatile TransactionBuffer transactionBuffer; | ||
| private volatile long startSequenceId = 0; | ||
| private volatile CompletableFuture<TransactionBufferReader> transactionBufferReader; | ||
|
|
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| public TransactionReader(AbstractBaseDispatcher abstractBaseDispatcher) { | ||
| this.dispatcher = abstractBaseDispatcher; | ||
| } | ||
|
|
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| /** | ||
| * Get ${@link TransactionBuffer} lazily and read transaction messages. | ||
| * | ||
| * @param readMessageNum messages num to read | ||
| * @param ctx context object | ||
| * @param readEntriesCallback ReadEntriesCallback | ||
| */ | ||
| public void read(int readMessageNum, Object ctx, AsyncCallbacks.ReadEntriesCallback readEntriesCallback) { | ||
| if (transactionBuffer == null) { | ||
| dispatcher.getSubscription().getTopic() | ||
| .getTransactionBuffer(false).whenComplete((tb, throwable) -> { | ||
| if (throwable != null) { | ||
| log.error("Get transactionBuffer failed.", throwable); | ||
| readEntriesCallback.readEntriesFailed( | ||
| ManagedLedgerException.getManagedLedgerException(throwable), ctx); | ||
| return; | ||
| } | ||
| transactionBuffer = tb; | ||
| internalRead(readMessageNum, ctx, readEntriesCallback); | ||
| }); | ||
| } else { | ||
| internalRead(readMessageNum, ctx, readEntriesCallback); | ||
| } | ||
| } | ||
|
|
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| /** | ||
| * Read specify number transaction messages by ${@link TransactionBufferReader}. | ||
| * | ||
| * @param readMessageNum messages num to read | ||
| * @param ctx context object | ||
| * @param readEntriesCallback ReadEntriesCallback | ||
| */ | ||
| private void internalRead(int readMessageNum, Object ctx, AsyncCallbacks.ReadEntriesCallback readEntriesCallback) { | ||
| final TxnID txnID = getValidTxn(); | ||
| if (txnID == null) { | ||
| log.error("No valid txn to read."); | ||
| readEntriesCallback.readEntriesFailed( | ||
| ManagedLedgerException.getManagedLedgerException(new Exception("No valid txn to read.")), ctx); | ||
| return; | ||
| } | ||
| if (transactionBufferReader == null) { | ||
| transactionBufferReader = transactionBuffer.openTransactionBufferReader(txnID, startSequenceId); | ||
| } | ||
| transactionBufferReader.thenAccept(reader -> { | ||
| reader.readNext(readMessageNum).whenComplete((transactionEntries, throwable) -> { | ||
| if (throwable != null) { | ||
| log.error("Read transaction messages failed.", throwable); | ||
| readEntriesCallback.readEntriesFailed( | ||
| ManagedLedgerException.getManagedLedgerException(throwable), ctx); | ||
| return; | ||
| } | ||
| if (transactionEntries == null || transactionEntries.size() < readMessageNum) { | ||
| startSequenceId = 0; | ||
| dispatcher.getPendingTxnQueue().remove(txnID); | ||
| transactionBufferReader = null; | ||
| reader.close(); | ||
| } | ||
| List<Entry> entryList = new ArrayList<>(transactionEntries.size()); | ||
| for (int i = 0; i < transactionEntries.size(); i++) { | ||
| if (i == (transactionEntries.size() -1)) { | ||
| startSequenceId = transactionEntries.get(i).sequenceId(); | ||
| } | ||
| entryList.add(transactionEntries.get(i).getEntry()); | ||
| } | ||
| readEntriesCallback.readEntriesComplete(entryList, ctx); | ||
| }); | ||
| }).exceptionally(throwable -> { | ||
| log.error("Open transactionBufferReader failed.", throwable); | ||
| readEntriesCallback.readEntriesFailed( | ||
| ManagedLedgerException.getManagedLedgerException(throwable), ctx); | ||
| return null; | ||
| }); | ||
| } | ||
|
|
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| private TxnID getValidTxn() { | ||
| TxnID txnID; | ||
| do { | ||
| txnID = dispatcher.getPendingTxnQueue().peek(); | ||
| if (txnID == null) { | ||
| if (log.isDebugEnabled()) { | ||
| log.debug("Peek null txnID from dispatcher pendingTxnQueue."); | ||
| } | ||
| dispatcher.getPendingTxnQueue().poll(); | ||
| if (dispatcher.getPendingTxnQueue().size() <= 0) { | ||
| break; | ||
| } | ||
| } | ||
| } while (txnID == null); | ||
| return txnID; | ||
| } | ||
|
|
||
| } |
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