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[log] Arrow Compression support estimate compression ratio in client
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106
fluss-common/src/main/java/com/alibaba/fluss/compression/ArrowCompressionRatioEstimator.java
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| /* | ||
| * Copyright (c) 2024 Alibaba Group Holding Ltd. | ||
| * | ||
| * Licensed 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 com.alibaba.fluss.compression; | ||
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| import com.alibaba.fluss.annotation.Internal; | ||
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| import javax.annotation.concurrent.ThreadSafe; | ||
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| import java.util.Map; | ||
| import java.util.concurrent.ConcurrentHashMap; | ||
| import java.util.concurrent.locks.Lock; | ||
| import java.util.concurrent.locks.ReentrantLock; | ||
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| import static com.alibaba.fluss.utils.concurrent.LockUtils.inLock; | ||
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| /** | ||
| * This class help estimate the compression ratio for each table and each arrow compression type | ||
| * combination. | ||
| */ | ||
| @Internal | ||
| @ThreadSafe | ||
| public class ArrowCompressionRatioEstimator { | ||
| /** | ||
| * The constant speed to increase compression ratio when a batch compresses better than | ||
| * expected. | ||
| */ | ||
| public static final float COMPRESSION_RATIO_IMPROVING_STEP = 0.005f; | ||
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| /** | ||
| * The minimum speed to decrease compression ratio when a batch compresses worse than expected. | ||
| */ | ||
| public static final float COMPRESSION_RATIO_DETERIORATE_STEP = 0.05f; | ||
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| private final Map<Long, Map<String, Float>> compressionRatio; | ||
| private final Map<Long, Lock> tableLocks; | ||
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| public ArrowCompressionRatioEstimator() { | ||
| compressionRatio = new ConcurrentHashMap<>(); | ||
| tableLocks = new ConcurrentHashMap<>(); | ||
| } | ||
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| /** | ||
| * Update the compression ratio estimation for a table and related compression info with the | ||
| * observed compression ratio. | ||
| */ | ||
| public void updateEstimation( | ||
| long tableId, ArrowCompressionInfo compressionInfo, float observedRatio) { | ||
| Lock lock = tableLocks.computeIfAbsent(tableId, k -> new ReentrantLock()); | ||
| inLock( | ||
| lock, | ||
| () -> { | ||
| Map<String, Float> compressionRatioMap = | ||
| compressionRatio.computeIfAbsent( | ||
| tableId, k -> new ConcurrentHashMap<>()); | ||
| String compressionKey = compressionInfo.toString(); | ||
| float currentEstimation = | ||
| compressionRatioMap.getOrDefault(compressionKey, 1.0f); | ||
| if (observedRatio > currentEstimation) { | ||
| compressionRatioMap.put( | ||
| compressionKey, | ||
| Math.max( | ||
| currentEstimation + COMPRESSION_RATIO_DETERIORATE_STEP, | ||
| observedRatio)); | ||
| } else if (observedRatio < currentEstimation) { | ||
| compressionRatioMap.put( | ||
| compressionKey, | ||
| Math.max( | ||
| currentEstimation - COMPRESSION_RATIO_IMPROVING_STEP, | ||
| observedRatio)); | ||
| } | ||
| }); | ||
| } | ||
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| /** Get the compression ratio estimation for a table and related compression info. */ | ||
| public float estimation(long tableId, ArrowCompressionInfo compressionInfo) { | ||
| Lock lock = tableLocks.computeIfAbsent(tableId, k -> new ReentrantLock()); | ||
| return inLock( | ||
| lock, | ||
| () -> { | ||
| Map<String, Float> compressionRatioMap = | ||
| compressionRatio.computeIfAbsent( | ||
| tableId, k -> new ConcurrentHashMap<>()); | ||
| String compressionKey = compressionInfo.toString(); | ||
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| if (!compressionRatioMap.containsKey(compressionKey)) { | ||
| compressionRatioMap.put(compressionKey, 1.0f); | ||
| } | ||
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| return compressionRatioMap.get(compressionKey); | ||
| }); | ||
| } | ||
| } |
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