pvary commented on code in PR #11513: URL: https://github.com/apache/iceberg/pull/11513#discussion_r1841867737
########## core/src/main/java/org/apache/iceberg/actions/RewriteFileGroupPlanner.java: ########## @@ -0,0 +1,175 @@ +/* + * 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.io.IOException; +import java.util.List; +import java.util.Map; +import java.util.concurrent.atomic.AtomicInteger; +import java.util.stream.Stream; +import org.apache.iceberg.DataFile; +import org.apache.iceberg.FileScanTask; +import org.apache.iceberg.RewriteJobOrder; +import org.apache.iceberg.StructLike; +import org.apache.iceberg.Table; +import org.apache.iceberg.data.GenericRecord; +import org.apache.iceberg.expressions.Expression; +import org.apache.iceberg.io.CloseableIterable; +import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList; +import org.apache.iceberg.relocated.com.google.common.collect.Lists; +import org.apache.iceberg.relocated.com.google.common.collect.Maps; +import org.apache.iceberg.types.Types; +import org.apache.iceberg.util.StructLikeMap; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * Checks the files in the table, and using the {@link FileRewriter} plans the groups for + * compaction. + */ +public class RewriteFileGroupPlanner { + private static final Logger LOG = LoggerFactory.getLogger(RewriteFileGroupPlanner.class); + + private final FileRewriter<FileScanTask, DataFile> rewriter; + private final RewriteJobOrder rewriteJobOrder; + + public RewriteFileGroupPlanner( + FileRewriter<FileScanTask, DataFile> rewriter, RewriteJobOrder rewriteJobOrder) { + this.rewriter = rewriter; + this.rewriteJobOrder = rewriteJobOrder; + } + + public RewritePlanResult plan(Table table, Expression filter, long startingSnapshotId) { + StructLikeMap<List<List<FileScanTask>>> plan = + planFileGroups(table, filter, startingSnapshotId); + RewriteExecutionContext ctx = new RewriteExecutionContext(); + Stream<RewriteFileGroup> groups = + plan.entrySet().stream() + .filter(e -> !e.getValue().isEmpty()) + .flatMap( + e -> { + StructLike partition = e.getKey(); + List<List<FileScanTask>> scanGroups = e.getValue(); + return scanGroups.stream().map(tasks -> newRewriteGroup(ctx, partition, tasks)); + }) + .sorted(RewriteFileGroup.comparator(rewriteJobOrder)); + Map<StructLike, Integer> groupsInPartition = plan.transformValues(List::size); + int totalGroupCount = groupsInPartition.values().stream().reduce(Integer::sum).orElse(0); + return new RewritePlanResult(groups, totalGroupCount, groupsInPartition); + } + + private StructLikeMap<List<List<FileScanTask>>> planFileGroups( + Table table, Expression filter, long startingSnapshotId) { + CloseableIterable<FileScanTask> fileScanTasks = + table + .newScan() + .useSnapshot(startingSnapshotId) + .filter(filter) + .ignoreResiduals() + .planFiles(); + + try { + Types.StructType partitionType = table.spec().partitionType(); + StructLikeMap<List<FileScanTask>> filesByPartition = + groupByPartition(table, partitionType, fileScanTasks); + return filesByPartition.transformValues( + tasks -> ImmutableList.copyOf(rewriter.planFileGroups(tasks))); + } finally { + try { + fileScanTasks.close(); + } catch (IOException io) { + LOG.error("Cannot properly close file iterable while planning for rewrite", io); + } + } + } + + private StructLikeMap<List<FileScanTask>> groupByPartition( + Table table, Types.StructType partitionType, Iterable<FileScanTask> tasks) { + StructLikeMap<List<FileScanTask>> filesByPartition = StructLikeMap.create(partitionType); + StructLike emptyStruct = GenericRecord.create(partitionType); + + for (FileScanTask task : tasks) { + // If a task uses an incompatible partition spec the data inside could contain values + // which belong to multiple partitions in the current spec. Treating all such files as + // un-partitioned and grouping them together helps to minimize new files made. + StructLike taskPartition = + task.file().specId() == table.spec().specId() ? task.file().partition() : emptyStruct; Review Comment: Do we want to make `EmptyStructLike`, and `EmptyStructLike.get` public? Currently it is package private. -- 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. To unsubscribe, e-mail: issues-unsubscr...@iceberg.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@iceberg.apache.org For additional commands, e-mail: issues-h...@iceberg.apache.org
