Core: Add benchmark for adding files

core/src/jmh/java/org/apache/iceberg/AppendBenchmark.java

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+/*
+ * 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;
+
+import static org.apache.iceberg.types.Types.NestedField.required;
+
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+import org.apache.iceberg.hadoop.HadoopTables;
+import org.apache.iceberg.relocated.com.google.common.collect.Lists;
+import org.apache.iceberg.types.Types;
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Fork;
+import org.openjdk.jmh.annotations.Measurement;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.Param;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.annotations.TearDown;
+import org.openjdk.jmh.annotations.Threads;
+import org.openjdk.jmh.annotations.Timeout;
+import org.openjdk.jmh.annotations.Warmup;
+import org.openjdk.jmh.infra.Blackhole;
+
+/**
+ * A benchmark that evaluates the performance of appending files to the table.
+ *
+ * <p>To run this benchmark: <code>
+ *   ./gradlew :iceberg-core:jmh
+ *       -PjmhIncludeRegex=AppendBenchmark
+ *       -PjmhOutputPath=benchmark/append-benchmark.txt
+ * </code>
+ */
+@Fork(1)
+@State(Scope.Benchmark)
+@Warmup(iterations = 3)
+@Measurement(iterations = 5)
+@BenchmarkMode(Mode.SingleShotTime)
+@Timeout(time = 10, timeUnit = TimeUnit.MINUTES)
+public class AppendBenchmark {
+
+  private static final String TABLE_IDENT = "tbl";
+  private static final Schema SCHEMA =
+      new Schema(
+          required(1, "int_col", Types.IntegerType.get()),
+          required(2, "long_col", Types.LongType.get()),
+          required(3, "decimal_col", Types.DecimalType.of(10, 10)),
+          required(4, "date_col", Types.DateType.get()),
+          required(5, "timestamp_col", Types.TimestampType.withoutZone()),
+          required(6, "timestamp_tz_col", Types.TimestampType.withZone()),
+          required(7, "str_col", Types.StringType.get()));
+  private static final PartitionSpec SPEC = PartitionSpec.unpartitioned();
+  private static final HadoopTables TABLES = new HadoopTables();
+
+  private Table table;
+  private List<DataFile> dataFiles;
+
+  @Param({"500000", "1000000", "2500000"})
+  private int numFiles;
+
+  @Param({"true", "false"})
+  private boolean fast;
+
+  @Setup
+  public void setupBenchmark() {
+    initTable();
+    initDataFiles();
+  }
+
+  @TearDown
+  public void tearDownBenchmark() {
+    dropTable();
+  }
+
+  @Benchmark
+  @Threads(1)
+  public void appendFiles(Blackhole blackhole) {
+    AppendFiles append = fast ? table.newFastAppend() : table.newAppend();
+
+    for (DataFile dataFile : dataFiles) {
+      append.appendFile(dataFile);
+    }
+
+    append.commit();
+  }
+
+  private void initTable() {
+    this.table = TABLES.create(SCHEMA, SPEC, TABLE_IDENT);
+  }
+
+  private void dropTable() {
+    TABLES.dropTable(TABLE_IDENT);
+  }
+
+  private void initDataFiles() {
+    List<DataFile> generatedDataFiles = Lists.newArrayListWithExpectedSize(numFiles);
+
+    for (int ordinal = 0; ordinal < numFiles; ordinal++) {
+      DataFile dataFile = FileGenerationUtil.generateDataFile(table, null);
+      generatedDataFiles.add(dataFile);
+    }
+
+    this.dataFiles = generatedDataFiles;
+  }
+}