[GitHub] [iceberg] kbendick commented on a diff in pull request #4904: Flink: new sink base on the unified sink API

[GitBox <gi...@apache.org>]

kbendick commented on code in PR #4904:
URL: https://github.com/apache/iceberg/pull/4904#discussion_r947020925


##########
flink/v1.15/flink/src/main/java/org/apache/iceberg/flink/sink/IcebergSink.java:
##########
@@ -0,0 +1,696 @@
+/*
+ * 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.flink.sink;
+
+import static org.apache.iceberg.TableProperties.WRITE_DISTRIBUTION_MODE;
+
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.function.Function;
+import javax.annotation.Nullable;
+import org.apache.flink.api.common.functions.MapFunction;
+import org.apache.flink.api.common.functions.RichMapFunction;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.api.connector.sink2.Committer;
+import org.apache.flink.api.connector.sink2.StatefulSink;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.configuration.ReadableConfig;
+import org.apache.flink.core.io.SimpleVersionedSerializer;
+import org.apache.flink.streaming.api.connector.sink2.CommittableMessage;
+import org.apache.flink.streaming.api.connector.sink2.CommittableWithLineage;
+import org.apache.flink.streaming.api.connector.sink2.WithPostCommitTopology;
+import org.apache.flink.streaming.api.connector.sink2.WithPreCommitTopology;
+import org.apache.flink.streaming.api.connector.sink2.WithPreWriteTopology;
+import org.apache.flink.streaming.api.datastream.DataStream;
+import org.apache.flink.streaming.api.datastream.DataStreamSink;
+import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;
+import org.apache.flink.table.api.TableSchema;
+import org.apache.flink.table.data.RowData;
+import org.apache.flink.table.data.util.DataFormatConverters;
+import org.apache.flink.table.types.DataType;
+import org.apache.flink.table.types.logical.RowType;
+import org.apache.flink.types.Row;
+import org.apache.iceberg.DataFile;
+import org.apache.iceberg.DistributionMode;
+import org.apache.iceberg.FileFormat;
+import org.apache.iceberg.PartitionField;
+import org.apache.iceberg.PartitionSpec;
+import org.apache.iceberg.Schema;
+import org.apache.iceberg.SerializableTable;
+import org.apache.iceberg.Table;
+import org.apache.iceberg.flink.FlinkSchemaUtil;
+import org.apache.iceberg.flink.FlinkWriteConf;
+import org.apache.iceberg.flink.FlinkWriteOptions;
+import org.apache.iceberg.flink.TableLoader;
+import org.apache.iceberg.flink.sink.committer.FilesCommittable;
+import org.apache.iceberg.flink.sink.committer.FilesCommittableSerializer;
+import org.apache.iceberg.flink.sink.committer.FilesCommitter;
+import org.apache.iceberg.flink.sink.writer.StreamWriter;
+import org.apache.iceberg.flink.sink.writer.StreamWriterState;
+import org.apache.iceberg.flink.sink.writer.StreamWriterStateSerializer;
+import org.apache.iceberg.flink.util.FlinkCompatibilityUtil;
+import org.apache.iceberg.relocated.com.google.common.base.Preconditions;
+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.Sets;
+import org.apache.iceberg.types.TypeUtil;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Flink v2 sink offer different hooks to insert custom topologies into the sink. It includes
+ * writers that can write data to files in parallel and route commit info globally to one Committer.
+ * Post commit topology will take of compacting the already written files and updating the file log
+ * after the compaction.
+ *
+ * <pre>{@code
+ *                            Flink sink
+ *               +------------------------------------------------------------------+
+ *               |                                                                  |
+ * +-------+     | +-------------+       +---------------+                          |
+ * | Map 1 | ==> | | writer 1 | =|       | committer 1   |                          |
+ * +-------+     | +-------------+       +---------------+                          |
+ *               |                 \                                                |
+ *               |                  \                                               |
+ *               |                   \                                              |
+ * +-------+     | +-------------+    \  +---------------+        +---------------+ |
+ * | Map 2 | ==> | | writer 2 | =| ---  >| committer 2   |  --->  | post commit   | |
+ * +-------+     | +-------------+       +---------------+        +---------------+ |
+ *               |                                                                  |
+ *               +------------------------------------------------------------------+
+ * }</pre>
+ */
+public class IcebergSink
+    implements StatefulSink<RowData, StreamWriterState>,
+        WithPreWriteTopology<RowData>,
+        WithPreCommitTopology<RowData, FilesCommittable>,
+        WithPostCommitTopology<RowData, FilesCommittable> {
+  private static final Logger LOG = LoggerFactory.getLogger(IcebergSink.class);
+
+  private final TableLoader tableLoader;
+  private final Table table;
+  private final boolean overwrite;
+  private final boolean upsertMode;
+  private final DistributionMode distributionMode;
+  private final List<String> equalityFieldColumns;
+  private final List<Integer> equalityFieldIds;
+  private final FileFormat dataFileFormat;
+  private final int workerPoolSize;
+  private final long targetDataFileSize;
+  private final String uidPrefix;
+  private final Map<String, String> snapshotProperties;
+  private final RowType flinkRowType;
+  private Committer<FilesCommittable> committer;
+
+  private IcebergSink(
+      TableLoader tableLoader,
+      @Nullable Table table,
+      List<Integer> equalityFieldIds,
+      List<String> equalityFieldColumns,
+      @Nullable String uidPrefix,
+      Map<String, String> snapshotProperties,
+      boolean upsertMode,
+      boolean overwrite,
+      TableSchema tableSchema,
+      DistributionMode distributionMode,
+      int workerPoolSize,
+      long targetDataFileSize,
+      FileFormat dataFileFormat) {
+    Preconditions.checkNotNull(tableLoader, "Table loader shouldn't be null");
+    Preconditions.checkNotNull(table, "Table shouldn't be null");
+
+    this.tableLoader = tableLoader;
+    this.table = table;
+    this.equalityFieldIds = equalityFieldIds;
+    this.equalityFieldColumns = equalityFieldColumns;
+    this.uidPrefix = uidPrefix == null ? "" : uidPrefix;
+    this.snapshotProperties = snapshotProperties;
+    this.flinkRowType = toFlinkRowType(table.schema(), tableSchema);
+    this.upsertMode = upsertMode;
+    this.overwrite = overwrite;
+    this.distributionMode = distributionMode;
+    this.workerPoolSize = workerPoolSize;
+    this.targetDataFileSize = targetDataFileSize;
+    this.dataFileFormat = dataFileFormat;
+  }
+
+  @Override
+  public DataStream<RowData> addPreWriteTopology(DataStream<RowData> inputDataStream) {
+    return distributeDataStream(
+        inputDataStream,
+        equalityFieldIds,
+        table.spec(),
+        table.schema(),
+        flinkRowType,
+        distributionMode,
+        equalityFieldColumns);
+  }
+
+  @Override
+  public StreamWriter createWriter(InitContext context) {
+    return restoreWriter(context, null);
+  }
+
+  @Override
+  public StreamWriter restoreWriter(
+      InitContext context, Collection<StreamWriterState> recoveredState) {
+    RowDataTaskWriterFactory taskWriterFactory =
+        new RowDataTaskWriterFactory(
+            SerializableTable.copyOf(table),
+            flinkRowType,
+            targetDataFileSize,
+            dataFileFormat,
+            equalityFieldIds,
+            upsertMode);
+    StreamWriter streamWriter =
+        new StreamWriter(
+            table.name(),
+            taskWriterFactory,
+            context.getSubtaskId(),
+            context.getNumberOfParallelSubtasks());
+    if (recoveredState == null) {

Review Comment:
   +1 keeps things simpler.



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