rdblue commented on code in PR #4518: URL: https://github.com/apache/iceberg/pull/4518#discussion_r862260651
########## core/src/main/java/org/apache/iceberg/io/CachingFileIO.java: ########## @@ -0,0 +1,355 @@ +/* + * 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.iceberg.io; + +import com.github.benmanes.caffeine.cache.Cache; +import com.github.benmanes.caffeine.cache.Caffeine; +import com.github.benmanes.caffeine.cache.Weigher; +import com.github.benmanes.caffeine.cache.stats.CacheStats; +import java.io.FileNotFoundException; +import java.io.IOException; +import java.nio.ByteBuffer; +import java.time.Duration; +import java.util.List; +import java.util.Map; +import org.apache.iceberg.CatalogProperties; +import org.apache.iceberg.exceptions.NotFoundException; +import org.apache.iceberg.exceptions.RuntimeIOException; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.apache.iceberg.relocated.com.google.common.collect.Lists; +import org.apache.iceberg.util.PropertyUtil; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * Implementation of FileIO that adds metadata content caching features. + * <p> + * CachingFileIO intend to speedup scan planning by caching most of the table metadata files in memory and reduce + * remote reads. It is not meant to be dynamically loaded. Instead, set + * {@link CatalogProperties#IO_CACHE_ENABLED} to true and use + * {@link org.apache.iceberg.CatalogUtil#loadFileIO(String, Map, Object)} to wrap another FileIO with this + * CachingFileIO. + */ +public class CachingFileIO implements FileIO { + private static final Logger LOG = LoggerFactory.getLogger(CachingFileIO.class); + private static final int BUFFER_CHUNK_SIZE = 4 * 1024 * 1024; // 4MB + private static ContentCache sharedCache; + + private static ContentCache createCache(Map<String, String> properties) { + long durationMs = PropertyUtil.propertyAsLong(properties, + CatalogProperties.IO_CACHE_EXPIRATION_INTERVAL_MS, + CatalogProperties.IO_CACHE_EXPIRATION_INTERVAL_MS_DEFAULT); + long totalBytes = PropertyUtil.propertyAsLong(properties, + CatalogProperties.IO_CACHE_MAX_TOTAL_BYTES, + CatalogProperties.IO_CACHE_MAX_TOTAL_BYTES_DEFAULT); + long contentLength = PropertyUtil.propertyAsLong(properties, + CatalogProperties.IO_CACHE_MAX_CONTENT_LENGTH, + CatalogProperties.IO_CACHE_MAX_CONTENT_LENGTH_DEFAULT); + + if (durationMs >= 0 && totalBytes > 0) { + return new ContentCache(durationMs, totalBytes, contentLength); + } else { + return null; + } + } + + public static synchronized ContentCache getOrCreate(Map<String, String> properties) { + if (sharedCache == null) { + sharedCache = createCache(properties); + } + return sharedCache; + } + + public static boolean ioCacheEnabled(Map<String, String> properties) { + boolean enabled = PropertyUtil.propertyAsBoolean(properties, + CatalogProperties.IO_CACHE_ENABLED, + CatalogProperties.IO_CACHE_ENABLED_DEFAULT); + long durationMs = PropertyUtil.propertyAsLong(properties, + CatalogProperties.IO_CACHE_EXPIRATION_INTERVAL_MS, + CatalogProperties.IO_CACHE_EXPIRATION_INTERVAL_MS_DEFAULT); + long totalBytes = PropertyUtil.propertyAsLong(properties, + CatalogProperties.IO_CACHE_MAX_TOTAL_BYTES, + CatalogProperties.IO_CACHE_MAX_TOTAL_BYTES_DEFAULT); + + return enabled && durationMs >= 0 && totalBytes > 0; + } + + private ContentCache fileContentCache; + private Map<String, String> properties; + private FileIO wrappedIO; + + /** + * CachingFileIO is not meant to be dynamically loaded. + */ + private CachingFileIO() { + } + + public CachingFileIO(FileIO io) { + assignIO(io); + } + + public void assignIO(FileIO io) { + this.wrappedIO = io; + } + + /** + * Initialize File IO from catalog properties. + * <p> + * It assumes that the inner FileIO is already initialized and therefore does not reinitialize it. + * If this is a reinitialization, it is the caller responsibility to call {@link #close()} and + * {@link #assignIO(FileIO)} prior to reinitialization to close the previously assigned FileIO and reassign a new one. + * Otherwise, previously assigned FileIO will be kept in use. + * <p> + * Reinitialization will discard previous content cache unless shared cache is being used + * ({@link CatalogProperties#IO_CACHE_SHARED} stays true). + * @param newProperties catalog properties + */ + @Override + public void initialize(Map<String, String> newProperties) { + this.properties = newProperties; + initCache(); + } + + private void initCache() { + boolean isSharedCache = PropertyUtil.propertyAsBoolean(properties, + CatalogProperties.IO_CACHE_SHARED, + CatalogProperties.IO_CACHE_SHARED_DEFAULT); + if (isSharedCache) { + this.fileContentCache = getOrCreate(properties); + LOG.info("CachingFileIO created with shared cache. {} ", this.fileContentCache); + } else { + this.fileContentCache = createCache(properties); + LOG.info("CachingFileIO created. {} ", this.fileContentCache); + } + } + + @Override + public void close() { + if (wrappedIO != null) { + wrappedIO.close(); + wrappedIO = null; + } + } + + @Override + public InputFile newInputFile(String path) { + InputFile inFile = wrappedIO.newInputFile(path); + if (fileContentCache != null && path.contains("/metadata/")) { + // TODO: Currently we just believe that this is a metadata file if it has "metadata" dir on its path. But metadata + // location can be set differently for different tables. A table might have different metadata path by + // setting custom "write.metadata.path" TableProperties. + // We might need to extend FileIO interface. Add method 'newMetadataInputFile' and let caller use it to + // differentiate metadata files vs other files. + return new CachingInputFile(fileContentCache, inFile); + } + return inFile; + } + + @Override + public OutputFile newOutputFile(String path) { + return wrappedIO.newOutputFile(path); + } + + @Override + public void deleteFile(String path) { + wrappedIO.deleteFile(path); + if (fileContentCache != null) { + fileContentCache.cache.invalidate(path); + } + } + + public ContentCache getCache() { + return fileContentCache; + } + + public long cacheEstimatedSize() { Review Comment: This should be `estimatedCacheSize`, right? This isn't caching the size. -- This is an automated message from the Apache Git Service. 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