RussellSpitzer commented on a change in pull request #2585: URL: https://github.com/apache/iceberg/pull/2585#discussion_r631515637
########## File path: core/src/main/java/org/apache/iceberg/actions/BinPackStrategy.java ########## @@ -0,0 +1,197 @@ +/* + * 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.actions; + +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.stream.Collectors; +import java.util.stream.StreamSupport; +import org.apache.iceberg.FileScanTask; +import org.apache.iceberg.TableProperties; +import org.apache.iceberg.actions.RewriteDataFiles.Strategy; +import org.apache.iceberg.relocated.com.google.common.collect.FluentIterable; +import org.apache.iceberg.relocated.com.google.common.collect.ImmutableSet; +import org.apache.iceberg.util.BinPacking; +import org.apache.iceberg.util.BinPacking.ListPacker; +import org.apache.iceberg.util.PropertyUtil; + +/** + * A rewrite strategy for datafiles which determines which files to rewrite + * based on their size. If files are either smaller than the min-file-size-bytes threshold or + * larger than the max-file-size-bytes threshold, they are considered targets for being rewritten. + * <p> + * Once filtered files are grouped based on a {@link BinPacking} into groups defined + * by max group size. Groups will be considered for rewriting if they contain more files + * than min-input-files and would produce more files than min-output-files. + */ +abstract class BinPackStrategy implements RewriteStrategy { + + /** + * Minimum number of files that need to be in a file group to be considered + * for rewriting. This is considered in conjunction with min-num-output-files, both + * conditions must pass to consider a group of files to be rewritten. + */ + public static final String MIN_INPUT_FILES = "min-input-files"; + public static final int MIN_INPUT_FILES_DEFAULT = 1; + + /** + * Minimum number of files we want to be created by file group when being + * rewritten. This is considered in conjunction with min-num-input-files, both + * conditions must pass to consider a group of files to be rewritten. + */ + public static final String MIN_OUTPUT_FILES = "min-output-files"; + public static final int MIN_OUTPUT_FILES_DEFAULT = 1; + + /** + * Adjusts files which will be considered for rewriting. Files smaller than + * min-file-size-bytes will be considered for rewriting. This functions independently + * of max-file-size-bytes. + * <p> + * Defaults to 75% of the target file size + */ + public static final String MIN_FILE_SIZE_BYTES = "min-file-size-bytes"; + public static final double MIN_FILE_SIZE_DEFAULT_RATIO = 0.75d; + + /** + * Adjusts files which will be considered for rewriting. Files larger than + * max-file-size-bytes will be considered for rewriting. This functions independently + * of min-file-size-bytes. + * <p> + * Defaults to 180% of the target file size + */ + public static final String MAX_FILE_SIZE_BYTES = "max-file-size-bytes"; + public static final double MAX_FILE_SIZE_DEFAULT_RATIO = 1.80d; + + private int minInputFiles; + private int minOutputFiles; + private long minFileSize; + private long maxFileSize; + private long targetFileSize; + private long maxGroupSize; + + @Override + public String name() { + return Strategy.BINPACK.name(); + } + + @Override + public Set<String> validOptions() { + return ImmutableSet.of( + MIN_INPUT_FILES, + MIN_OUTPUT_FILES, + MIN_FILE_SIZE_BYTES, + MAX_FILE_SIZE_BYTES + ); + } + + @Override + public RewriteStrategy options(Map<String, String> options) { + targetFileSize = PropertyUtil.propertyAsLong(options, + RewriteDataFiles.TARGET_FILE_SIZE_BYTES, + PropertyUtil.propertyAsLong( + table().properties(), + TableProperties.WRITE_TARGET_FILE_SIZE_BYTES, + TableProperties.WRITE_TARGET_FILE_SIZE_BYTES_DEFAULT)); + + minFileSize = PropertyUtil.propertyAsLong(options, + MIN_FILE_SIZE_BYTES, + (long) (targetFileSize * MIN_FILE_SIZE_DEFAULT_RATIO)); + + maxFileSize = PropertyUtil.propertyAsLong(options, + MAX_FILE_SIZE_BYTES, + (long) (targetFileSize * MAX_FILE_SIZE_DEFAULT_RATIO)); + + maxGroupSize = PropertyUtil.propertyAsLong(options, + RewriteDataFiles.MAX_FILE_GROUP_SIZE_BYTES, + RewriteDataFiles.MAX_FILE_GROUP_SIZE_BYTES_DEFAULT); + + minOutputFiles = PropertyUtil.propertyAsInt(options, + MIN_OUTPUT_FILES, + MIN_OUTPUT_FILES_DEFAULT); + + minInputFiles = PropertyUtil.propertyAsInt(options, + MIN_INPUT_FILES, + MIN_INPUT_FILES_DEFAULT); + + validateOptions(); + return this; + } + + @Override + public Iterable<FileScanTask> selectFilesToRewrite(Iterable<FileScanTask> dataFiles) { + return FluentIterable.from(dataFiles) + .filter(scanTask -> scanTask.length() < minFileSize || scanTask.length() > maxFileSize); Review comment: Currently they are synonymous, BaseFileScanTask just calls file.length. I'm not super worried about this just yet. I think this won't be an issue in the future issue since you can't determine how many records are deleted and the new scan task size without actually reading the file so I don't think that info will be there? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
