marton-bod commented on a change in pull request #2842: URL: https://github.com/apache/hive/pull/2842#discussion_r798751310
########## File path: iceberg/patched-iceberg-core/src/main/java/org/apache/iceberg/io/ClusteredWriter.java ########## @@ -0,0 +1,159 @@ +/* + * 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 java.io.IOException; +import java.io.UncheckedIOException; +import java.util.Comparator; +import java.util.Set; +import org.apache.iceberg.PartitionSpec; +import org.apache.iceberg.StructLike; +import org.apache.iceberg.encryption.EncryptedOutputFile; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.apache.iceberg.relocated.com.google.common.collect.Sets; +import org.apache.iceberg.types.Comparators; +import org.apache.iceberg.types.Types.StructType; +import org.apache.iceberg.util.StructLikeSet; + +/** + * Copied over from Iceberg 0.13.0 and has a difference of allowing bucket transform partitions to arrive without + * any ordering. This is a temporary convenience solution until a permanent one probably using UDFs is done. + * + * Original description: + * + * A writer capable of writing to multiple specs and partitions that requires the incoming records + * to be clustered by partition spec and by partition within each spec. + * <p> + * As opposed to {@link FanoutWriter}, this writer keeps at most one file open to reduce + * the memory consumption. Prefer using this writer whenever the incoming records can be clustered + * by spec/partition. + */ +abstract class ClusteredWriter<T, R> implements PartitioningWriter<T, R> { + + private static final Class<?> BUCKET_TRANSFORM_CLAZZ; + + static { + try { + BUCKET_TRANSFORM_CLAZZ = Class.forName("org.apache.iceberg.transforms.Bucket"); + } catch (ClassNotFoundException e) { + throw new RuntimeException("Couldn't find Bucket transform class", e); + } + } + + private static final String NOT_CLUSTERED_ROWS_ERROR_MSG_TEMPLATE = + "Incoming records violate the writer assumption that records are clustered by spec and " + + "by partition within each spec. Either cluster the incoming records or switch to fanout writers.\n" + + "Encountered records that belong to already closed files:\n"; + + private final Set<Integer> completedSpecIds = Sets.newHashSet(); + + private PartitionSpec currentSpec = null; + private Comparator<StructLike> partitionComparator = null; + private Set<StructLike> completedPartitions = null; + private StructLike currentPartition = null; + private FileWriter<T, R> currentWriter = null; + + private boolean closed = false; + + protected abstract FileWriter<T, R> newWriter(PartitionSpec spec, StructLike partition); + + protected abstract void addResult(R result); + + protected abstract R aggregatedResult(); + + @Override + public void write(T row, PartitionSpec spec, StructLike partition) { + if (!spec.equals(currentSpec)) { + if (currentSpec != null) { + closeCurrentWriter(); + completedSpecIds.add(currentSpec.specId()); + completedPartitions.clear(); + } + + if (completedSpecIds.contains(spec.specId())) { + String errorCtx = String.format("spec %s", spec); + throw new IllegalStateException(NOT_CLUSTERED_ROWS_ERROR_MSG_TEMPLATE + errorCtx); + } + + StructType partitionType = spec.partitionType(); + + this.currentSpec = spec; + this.partitionComparator = Comparators.forType(partitionType); + this.completedPartitions = StructLikeSet.create(partitionType); + // copy the partition key as the key object may be reused + this.currentPartition = StructCopy.copy(partition); + this.currentWriter = newWriter(currentSpec, currentPartition); + + } else if (partition != currentPartition && partitionComparator.compare(partition, currentPartition) != 0) { + closeCurrentWriter(); + completedPartitions.add(currentPartition); + + if (completedPartitions.contains(partition) && !hasBucketTransform(currentSpec)) { Review comment: If so, is there a way to verify the problem is with `c` being out of order, using partition object? -- This is an automated message from the Apache Git Service. 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