rdblue commented on a change in pull request #1083: URL: https://github.com/apache/iceberg/pull/1083#discussion_r436850092
########## File path: spark/src/main/java/org/apache/iceberg/actions/RewriteDataFilesAction.java ########## @@ -0,0 +1,275 @@ +/* + * 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.Collection; +import java.util.List; +import java.util.Map; +import java.util.stream.Collectors; +import org.apache.iceberg.CombinedScanTask; +import org.apache.iceberg.DataFile; +import org.apache.iceberg.FileScanTask; +import org.apache.iceberg.PartitionSpec; +import org.apache.iceberg.RewriteFiles; +import org.apache.iceberg.Table; +import org.apache.iceberg.TableProperties; +import org.apache.iceberg.encryption.EncryptionManager; +import org.apache.iceberg.expressions.Expression; +import org.apache.iceberg.expressions.Expressions; +import org.apache.iceberg.hadoop.HadoopFileIO; +import org.apache.iceberg.io.CloseableIterable; +import org.apache.iceberg.io.CloseableIterator; +import org.apache.iceberg.io.FileIO; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.apache.iceberg.relocated.com.google.common.collect.Iterables; +import org.apache.iceberg.relocated.com.google.common.collect.ListMultimap; +import org.apache.iceberg.relocated.com.google.common.collect.Lists; +import org.apache.iceberg.relocated.com.google.common.collect.Maps; +import org.apache.iceberg.relocated.com.google.common.collect.Multimaps; +import org.apache.iceberg.relocated.com.google.common.collect.Sets; +import org.apache.iceberg.relocated.com.google.common.collect.Streams; +import org.apache.iceberg.spark.source.RowDataRewriter; +import org.apache.iceberg.util.PropertyUtil; +import org.apache.iceberg.util.StructLikeWrapper; +import org.apache.iceberg.util.TableScanUtil; +import org.apache.iceberg.util.Tasks; +import org.apache.spark.api.java.JavaRDD; +import org.apache.spark.api.java.JavaSparkContext; +import org.apache.spark.broadcast.Broadcast; +import org.apache.spark.sql.SparkSession; +import org.apache.spark.util.SerializableConfiguration; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +public class RewriteDataFilesAction + extends BaseSnapshotUpdateAction<RewriteDataFilesAction, RewriteDataFilesActionResult> { + + private static final Logger LOG = LoggerFactory.getLogger(RewriteDataFilesAction.class); + + private final JavaSparkContext sparkContext; + private final Table table; + private final FileIO fileIO; + private final EncryptionManager encryptionManager; + private final boolean caseSensitive; + private long targetSizeInBytes; + private int splitLookback; + + private PartitionSpec spec = null; + private Expression filter; + + RewriteDataFilesAction(SparkSession spark, Table table) { + this.sparkContext = new JavaSparkContext(spark.sparkContext()); + this.table = table; + this.spec = table.spec(); + this.filter = Expressions.alwaysTrue(); + this.caseSensitive = Boolean.parseBoolean(spark.conf().get("spark.sql.caseSensitive", "false")); + + long splitSize = PropertyUtil.propertyAsLong( + table.properties(), + TableProperties.SPLIT_SIZE, + TableProperties.SPLIT_SIZE_DEFAULT); + long targetFileSize = PropertyUtil.propertyAsLong( + table.properties(), + TableProperties.WRITE_TARGET_FILE_SIZE_BYTES, + TableProperties.WRITE_TARGET_FILE_SIZE_BYTES_DEFAULT); + this.targetSizeInBytes = Math.min(splitSize, targetFileSize); + + this.splitLookback = PropertyUtil.propertyAsInt( + table.properties(), + TableProperties.SPLIT_LOOKBACK, + TableProperties.SPLIT_LOOKBACK_DEFAULT); + + if (table.io() instanceof HadoopFileIO) { + // we need to use Spark's SerializableConfiguration to avoid issues with Kryo serialization + SerializableConfiguration conf = new SerializableConfiguration(((HadoopFileIO) table.io()).conf()); + this.fileIO = new HadoopFileIO(conf::value); + } else { + this.fileIO = table.io(); + } + this.encryptionManager = table.encryption(); + } + + @Override + protected RewriteDataFilesAction self() { + return this; + } + + @Override + protected Table table() { + return table; + } + + /** + * Pass a PartitionSepc id to specify which PartitionSpec should be used in DataFile rewrite + * + * @param specId PartitionSpec id to rewrite + * @return this for method chaining + */ + public RewriteDataFilesAction outputSpecId(int specId) { + Preconditions.checkArgument(table.specs().containsKey(specId), "Invalid spec id %d", specId); + this.spec = table.specs().get(specId); + return this; + } + + /** + * Specify the target rewrite data file size in bytes + * + * @param targetSize size in bytes of rewrite data file + * @return this for method chaining + */ + public RewriteDataFilesAction targetSizeInBytes(long targetSize) { + Preconditions.checkArgument(targetSize > 0L, "Invalid target rewrite data file size in bytes %d", + targetSize); + this.targetSizeInBytes = targetSize; + return this; + } + + /** + * Specify the number of "bins" considered when trying to pack the next file split into a task. + * Increasing this usually makes tasks a bit more even by considering more ways to pack file regions into a single + * task with extra planning cost. + * <p> + * This configuration can reorder the incoming file regions, to preserve order for lower/upper bounds in file + * metadata, user can use a lookback of 1. + * + * @param lookback number of "bins" considered when trying to pack the next file split into a task. + * @return this for method chaining + */ + public RewriteDataFilesAction splitLookback(int lookback) { + Preconditions.checkArgument(lookback > 0L, "Invalid split lookback %d", lookback); + this.splitLookback = lookback; + return this; + } + + /** + * Pass a row Expression to filter DataFiles to be rewritten. Note that all files that may contain data matching the + * filter may be rewritten. + * + * @param expr Expression to filter out DataFiles + * @return this for method chaining + */ + public RewriteDataFilesAction filter(Expression expr) { + this.filter = Expressions.and(filter, expr); + return this; + } + + @Override + public RewriteDataFilesActionResult execute() { + CloseableIterable<FileScanTask> fileScanTasks = null; + try { + fileScanTasks = table.newScan() + .caseSensitive(caseSensitive) + .filter(filter) + .planFiles(); + } finally { + try { + if (fileScanTasks != null) { + fileScanTasks.close(); + } + } catch (IOException ioe) { + LOG.warn("Failed to close task iterable", ioe); + } + } + + Map<StructLikeWrapper, Collection<FileScanTask>> groupedTasks = groupTasksByPartition(fileScanTasks.iterator()); + Map<StructLikeWrapper, Collection<FileScanTask>> filteredGroupedTasks = groupedTasks.entrySet().stream() + .filter(kv -> kv.getValue().size() > 1) + .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue)); + + // Nothing to rewrite if there's only one DataFile in each partition. + if (filteredGroupedTasks.isEmpty()) { + return RewriteDataFilesActionResult.empty(); + } + + long openFileCost = PropertyUtil.propertyAsLong( + table.properties(), + TableProperties.SPLIT_OPEN_FILE_COST, + TableProperties.SPLIT_OPEN_FILE_COST_DEFAULT); + + // Split and combine tasks under each partition + List<CombinedScanTask> combinedScanTasks = filteredGroupedTasks.values().stream() + .map(scanTasks -> { + CloseableIterable<FileScanTask> splitTasks = TableScanUtil.splitFiles( + CloseableIterable.withNoopClose(scanTasks), targetSizeInBytes); + return TableScanUtil.planTasks(splitTasks, targetSizeInBytes, splitLookback, openFileCost); + }) + .flatMap(Streams::stream) + .collect(Collectors.toList()); + + JavaRDD<CombinedScanTask> taskRDD = sparkContext.parallelize(combinedScanTasks, combinedScanTasks.size()); + + Broadcast<FileIO> io = sparkContext.broadcast(fileIO); + Broadcast<EncryptionManager> encryption = sparkContext.broadcast(encryptionManager); + + RowDataRewriter rowDataRewriter = + new RowDataRewriter(table, spec, caseSensitive, io, encryption, targetSizeInBytes); + + List<DataFile> addedDataFiles = rowDataRewriter.rewriteDataForTasks(taskRDD); + List<DataFile> currentDataFiles = filteredGroupedTasks.values().stream() + .flatMap(tasks -> tasks.stream().map(FileScanTask::file)) + .collect(Collectors.toList()); + replaceDataFiles(currentDataFiles, addedDataFiles); + + return new RewriteDataFilesActionResult(currentDataFiles, addedDataFiles); + } + + private Map<StructLikeWrapper, Collection<FileScanTask>> groupTasksByPartition( + CloseableIterator<FileScanTask> tasksIter) { + ListMultimap<StructLikeWrapper, FileScanTask> tasksGroupedByPartition = Multimaps.newListMultimap( + Maps.newHashMap(), Lists::newArrayList); + + try { + tasksIter.forEachRemaining(task -> { + StructLikeWrapper structLike = StructLikeWrapper.wrap(task.file().partition()); + tasksGroupedByPartition.put(structLike, task); + }); + + } finally { + try { + tasksIter.close(); + } catch (IOException ioe) { + LOG.warn("Failed to close task iterator", ioe); + } + } + + return tasksGroupedByPartition.asMap(); + } + + private void replaceDataFiles(Iterable<DataFile> deletedDataFiles, Iterable<DataFile> addedDataFiles) { + boolean threw = true; + + try { + RewriteFiles rewriteFiles = table.newRewrite(); + rewriteFiles.rewriteFiles(Sets.newHashSet(deletedDataFiles), Sets.newHashSet(addedDataFiles)); + commit(rewriteFiles); + threw = false; + + } finally { + if (threw) { Review comment: We typically use this pattern with a `threw` boolean to always clean up even if the throwable isn't an `Exception`. It's more important to do this when the finally block needs to execute for all cases, though. I think it would be probably be fine to catch `Exception` here like it was originally -- sorry for the bad review comment. ---------------------------------------------------------------- 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]
