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[hotfix][kafka] Extract TransactionalIdsGenerator class from FlinkKaf…
…kaProducer011 This is pure refactor without any functional changes.
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.../java/org/apache/flink/streaming/connectors/kafka/internal/TransactionalIdsGenerator.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.flink.streaming.connectors.kafka.internal; | ||
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| import java.util.HashSet; | ||
| import java.util.Set; | ||
| import java.util.stream.Collectors; | ||
| import java.util.stream.LongStream; | ||
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| import static org.apache.flink.util.Preconditions.checkNotNull; | ||
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| /** | ||
| * Class responsible for generating transactional ids to use when communicating with Kafka. | ||
| */ | ||
| public class TransactionalIdsGenerator { | ||
| private final String prefix; | ||
| private final int subtaskIndex; | ||
| private final int poolSize; | ||
| private final int safeScaleDownFactor; | ||
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| public TransactionalIdsGenerator( | ||
| String prefix, | ||
| int subtaskIndex, | ||
| int poolSize, | ||
| int safeScaleDownFactor) { | ||
| this.prefix = checkNotNull(prefix); | ||
| this.subtaskIndex = subtaskIndex; | ||
| this.poolSize = poolSize; | ||
| this.safeScaleDownFactor = safeScaleDownFactor; | ||
| } | ||
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| /** | ||
| * Range of available transactional ids to use is: | ||
| * [nextFreeTransactionalId, nextFreeTransactionalId + parallelism * kafkaProducersPoolSize) | ||
| * loop below picks in a deterministic way a subrange of those available transactional ids based on index of | ||
| * this subtask. | ||
| */ | ||
| public Set<String> generateIdsToUse(long nextFreeTransactionalId) { | ||
| Set<String> transactionalIds = new HashSet<>(); | ||
| for (int i = 0; i < poolSize; i++) { | ||
| long transactionalId = nextFreeTransactionalId + subtaskIndex * poolSize + i; | ||
| transactionalIds.add(generateTransactionalId(transactionalId)); | ||
| } | ||
| return transactionalIds; | ||
| } | ||
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| /** | ||
| * If we have to abort previous transactional id in case of restart after a failure BEFORE first checkpoint | ||
| * completed, we don't know what was the parallelism used in previous attempt. In that case we must guess the ids | ||
| * range to abort based on current configured pool size, current parallelism and safeScaleDownFactor. | ||
| */ | ||
| public Set<String> generateIdsToAbort() { | ||
| long abortTransactionalIdStart = subtaskIndex; | ||
| long abortTransactionalIdEnd = abortTransactionalIdStart + 1; | ||
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| abortTransactionalIdStart *= poolSize * safeScaleDownFactor; | ||
| abortTransactionalIdEnd *= poolSize * safeScaleDownFactor; | ||
| return LongStream.range(abortTransactionalIdStart, abortTransactionalIdEnd) | ||
| .mapToObj(this::generateTransactionalId) | ||
| .collect(Collectors.toSet()); | ||
| } | ||
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| private String generateTransactionalId(long transactionalId) { | ||
| return String.format(prefix + "-%d", transactionalId); | ||
| } | ||
| } |