RussellSpitzer commented on a change in pull request #2591: URL: https://github.com/apache/iceberg/pull/2591#discussion_r635328459
########## File path: spark/src/main/java/org/apache/iceberg/spark/actions/BaseRewriteDataFilesSparkAction.java ########## @@ -0,0 +1,505 @@ +/* + * 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.spark.actions; + +import java.io.IOException; +import java.math.RoundingMode; +import java.util.Collections; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.UUID; +import java.util.concurrent.ConcurrentHashMap; +import java.util.concurrent.ConcurrentLinkedQueue; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.concurrent.atomic.AtomicInteger; +import java.util.stream.Collectors; +import java.util.stream.Stream; +import org.apache.iceberg.DataFile; +import org.apache.iceberg.FileScanTask; +import org.apache.iceberg.StructLike; +import org.apache.iceberg.Table; +import org.apache.iceberg.actions.RewriteDataFiles; +import org.apache.iceberg.actions.RewriteStrategy; +import org.apache.iceberg.expressions.Expression; +import org.apache.iceberg.expressions.Expressions; +import org.apache.iceberg.io.CloseableIterable; +import org.apache.iceberg.relocated.com.google.common.annotations.VisibleForTesting; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList; +import org.apache.iceberg.relocated.com.google.common.collect.ImmutableSet; +import org.apache.iceberg.relocated.com.google.common.collect.Maps; +import org.apache.iceberg.relocated.com.google.common.collect.Sets; +import org.apache.iceberg.relocated.com.google.common.collect.Streams; +import org.apache.iceberg.relocated.com.google.common.math.IntMath; +import org.apache.iceberg.relocated.com.google.common.util.concurrent.ThreadFactoryBuilder; +import org.apache.iceberg.util.Pair; +import org.apache.iceberg.util.PropertyUtil; +import org.apache.iceberg.util.Tasks; +import org.apache.spark.sql.SparkSession; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +abstract class BaseRewriteDataFilesSparkAction + extends BaseSnapshotUpdateSparkAction<RewriteDataFiles, RewriteDataFiles.Result> implements RewriteDataFiles { + + private static final Logger LOG = LoggerFactory.getLogger(BaseRewriteDataFilesSparkAction.class); + private static final Set<String> VALID_OPTIONS = ImmutableSet.of( + MAX_CONCURRENT_FILE_GROUP_REWRITES, + MAX_FILE_GROUP_SIZE_BYTES, + PARTIAL_PROGRESS_ENABLED, + PARTIAL_PROGRESS_MAX_COMMITS, + TARGET_FILE_SIZE_BYTES + ); + + private final Table table; + + private Expression filter = Expressions.alwaysTrue(); + private int maxConcurrentFileGroupRewrites; + private int maxCommits; + private boolean partialProgressEnabled; + private RewriteStrategy strategy; + + protected BaseRewriteDataFilesSparkAction(SparkSession spark, Table table) { + super(spark); + this.table = table; + this.strategy = defaultStrategy(); + } + + protected Table table() { + return table; + } + + /** + * The framework specific strategy to use when no strategy is chosen via an explicit API + */ + protected abstract RewriteStrategy defaultStrategy(); + + /** + * Perform a commit operation on the table adding and removing files as + * required for this set of file groups + * @param completedGroupIDs fileSets to commit + */ + protected abstract void commitFileGroups(Set<String> completedGroupIDs); + + /** + * Clean up a specified file set by removing any files created for that operation, should + * not throw any exceptions + * @param groupID fileSet to clean + */ + protected abstract void abortFileGroup(String groupID); + + @Override + public RewriteDataFiles filter(Expression expression) { + filter = Expressions.and(filter, expression); + return this; + } + + @Override + public Result execute() { + validateOptions(); + strategy = strategy.options(options()); + + Map<StructLike, List<List<FileScanTask>>> fileGroupsByPartition = planFileGroups(); + RewriteExecutionContext ctx = new RewriteExecutionContext(fileGroupsByPartition); + Stream<FileGroupForRewrite> groupStream = toGroupStream(ctx, fileGroupsByPartition); + + if (ctx.totalGroupCount() == 0) { + LOG.info("Nothing found to rewrite in {}", table.name()); + return new Result(Collections.emptyMap()); + } + + if (partialProgressEnabled) { + return doExecuteWithPartialProgress(ctx, groupStream); + } else { + return doExecute(ctx, groupStream); + } + } + + private Map<StructLike, List<List<FileScanTask>>> planFileGroups() { + CloseableIterable<FileScanTask> fileScanTasks = table.newScan() + .filter(filter) + .ignoreResiduals() + .planFiles(); + + try { + Map<StructLike, List<FileScanTask>> filesByPartition = Streams.stream(fileScanTasks) + .collect(Collectors.groupingBy(task -> task.file().partition())); + + Map<StructLike, List<List<FileScanTask>>> fileGroupsByPartition = Maps.newHashMap(); + + filesByPartition.forEach((partition, tasks) -> { + List<List<FileScanTask>> fileGroups = toFileGroups(tasks); + if (fileGroups.size() > 0) { + fileGroupsByPartition.put(partition, fileGroups); + } + }); + + return fileGroupsByPartition; + } finally { + try { + fileScanTasks.close(); + } catch (IOException io) { + LOG.error("Cannot properly close file iterable while planning for rewrite", io); + } + } + } + + private List<List<FileScanTask>> toFileGroups(List<FileScanTask> tasks) { + Iterable<FileScanTask> filtered = strategy.selectFilesToRewrite(tasks); + Iterable<List<FileScanTask>> groupedTasks = strategy.planFileGroups(filtered); + return ImmutableList.copyOf(groupedTasks); + } + + @VisibleForTesting + void rewriteFiles(RewriteExecutionContext ctx, FileGroupForRewrite fileGroupForRewrite, + ConcurrentLinkedQueue<String> completedRewrite, + ConcurrentHashMap<String, Pair<FileGroupInfo, FileGroupRewriteResult>> results) { + + String groupID = fileGroupForRewrite.groupID(); + int filesInGroup = fileGroupForRewrite.numFiles(); + + String desc = jobDesc(fileGroupForRewrite, ctx); + + Set<DataFile> addedFiles = + withJobGroupInfo(newJobGroupInfo("REWRITE-DATA-FILES", desc), + () -> strategy.rewriteFiles(groupID, fileGroupForRewrite.files())); + + completedRewrite.offer(groupID); + FileGroupRewriteResult fileGroupResult = new FileGroupRewriteResult(addedFiles.size(), filesInGroup); + + results.put(groupID, Pair.of(fileGroupForRewrite.info(), fileGroupResult)); + } + + private void commitOrClean(Set<String> completedGroupIDs) { + try { + commitFileGroups(completedGroupIDs); + } catch (Exception e) { + LOG.error("Cannot commit groups {}, attempting to clean up written files", completedGroupIDs, e); + Tasks.foreach(completedGroupIDs) + .suppressFailureWhenFinished() + .run(this::abortFileGroup); + throw e; + } + } + + private Result doExecute(RewriteExecutionContext ctx, Stream<FileGroupForRewrite> groupStream) { + + ExecutorService rewriteService = Executors.newFixedThreadPool(maxConcurrentFileGroupRewrites, + new ThreadFactoryBuilder().setNameFormat("Rewrite-Service-%d").build()); + + ConcurrentLinkedQueue<String> completedRewrite = new ConcurrentLinkedQueue<>(); + ConcurrentHashMap<String, Pair<FileGroupInfo, FileGroupRewriteResult>> results = new ConcurrentHashMap<>(); + + Tasks.Builder<FileGroupForRewrite> rewriteTaskBuilder = Tasks.foreach(groupStream.iterator()) + .executeWith(rewriteService) + .stopOnFailure() + .noRetry() + .onFailure((fileGroupForRewrite, exception) -> { + LOG.error("Failure during rewrite process for group {}", fileGroupForRewrite.info, exception); + }); + + try { + rewriteTaskBuilder + .run(fileGroupForRewrite -> rewriteFiles(ctx, fileGroupForRewrite, completedRewrite, results)); + } catch (Exception e) { + // At least one rewrite group failed, clean up all completed rewrites + LOG.error("Cannot complete rewrite, partial progress is not enabled and one of the file set groups failed to " + + "be rewritten. Cleaning up {} groups which finished being written.", completedRewrite.size(), e); + Tasks.foreach(completedRewrite) + .suppressFailureWhenFinished() + .run(this::abortFileGroup); + throw e; + } + + commitOrClean(ImmutableSet.copyOf(completedRewrite)); + + return new Result(results.values().stream().collect(Collectors.toMap(Pair::first, Pair::second))); + } + + private Result doExecuteWithPartialProgress(RewriteExecutionContext ctx, Stream<FileGroupForRewrite> groupStream) { + + ExecutorService rewriteService = Executors.newFixedThreadPool(maxConcurrentFileGroupRewrites, + new ThreadFactoryBuilder().setNameFormat("Rewrite-Service-%d").build()); + + ExecutorService committerService = Executors.newSingleThreadExecutor( + new ThreadFactoryBuilder().setNameFormat("Committer-Service").build()); + + int groupsPerCommit = IntMath.divide(ctx.totalGroupCount(), maxCommits, RoundingMode.CEILING); + + AtomicBoolean stillRewriting = new AtomicBoolean(true); + ConcurrentHashMap<String, Pair<FileGroupInfo, FileGroupRewriteResult>> results = new ConcurrentHashMap<>(); + ConcurrentLinkedQueue<String> completedRewriteIds = new ConcurrentLinkedQueue<>(); + + // Partial progress commit service + committerService.execute(() -> { + while (stillRewriting.get() || completedRewriteIds.size() > 0) { + Thread.yield(); + // Either we have a full commit group, or we have completed writing and need to commit what is left over + if (completedRewriteIds.size() >= groupsPerCommit || + (!stillRewriting.get() && completedRewriteIds.size() > 0)) { + + Set<String> batch = Sets.newHashSetWithExpectedSize(groupsPerCommit); + for (int i = 0; i < groupsPerCommit && !completedRewriteIds.isEmpty(); i++) { + batch.add(completedRewriteIds.poll()); + } + + try { + commitOrClean(batch); + } catch (Exception e) { + batch.forEach(results::remove); + LOG.error("Failure during rewrite commit process, partial progress enabled. Ignoring", e); + } + } + } + }); + + // Start rewrite tasks + Tasks.foreach(groupStream.iterator()) + .suppressFailureWhenFinished() + .executeWith(rewriteService) + .noRetry() + .onFailure((fileGroupForRewrite, exception) -> { + LOG.error("Failure during rewrite process for group {}", fileGroupForRewrite.info, exception); + abortFileGroup(fileGroupForRewrite.groupID()); }) + .run(infoListPair -> rewriteFiles(ctx, infoListPair, completedRewriteIds, results)); + + stillRewriting.set(false); + committerService.shutdown(); + + try { + committerService.awaitTermination(10, TimeUnit.MINUTES); + } catch (InterruptedException e) { + throw new RuntimeException("Cannot complete commit for rewrite, commit service interrupted", e); + } + + return new Result(results.values().stream().collect(Collectors.toMap(Pair::first, Pair::second))); + } + + private Stream<FileGroupForRewrite> toGroupStream(RewriteExecutionContext ctx, + Map<StructLike, List<List<FileScanTask>>> fileGroupsByPartition) { + + // Todo Add intelligence to the order in which we do rewrites instead of just using partition order + return fileGroupsByPartition.entrySet().stream() + .flatMap( + e -> e.getValue().stream().map(tasks -> { + int myJobIndex = ctx.currentGlobalIndex(); Review comment: switched to those - current so the "new FileGroup" fits on one line -- This is an automated message from the Apache Git Service. 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