| /* |
| * 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 java.util.Locale; |
| import org.apache.iceberg.relocated.com.google.common.base.Preconditions; |
| |
| /** |
| * Enum of supported write distribution mode, it defines the write behavior of batch or streaming job: |
| * <p> |
| * 1. none: don't shuffle rows. It is suitable for scenarios where the rows are located in only few |
| * partitions, otherwise that may produce too many small files because each task is writing rows into different |
| * partitions randomly. |
| * <p> |
| * 2. hash: hash distribute by partition key, which is suitable for the scenarios where the rows are located |
| * into different partitions evenly. |
| * <p> |
| * 3. range: range distribute by partition key (or sort key if table has an {@link SortOrder}), which is suitable |
| * for the scenarios where rows are located into different partitions with skew distribution. |
| */ |
| public enum DistributionMode { |
| NONE("none"), HASH("hash"), RANGE("range"); |
| |
| private final String modeName; |
| |
| DistributionMode(String modeName) { |
| this.modeName = modeName; |
| } |
| |
| public String modeName() { |
| return modeName; |
| } |
| |
| public static DistributionMode fromName(String modeName) { |
| Preconditions.checkNotNull(modeName, "Name of distribution mode should not be null"); |
| return DistributionMode.valueOf(modeName.toUpperCase(Locale.ENGLISH)); |
| } |
| } |