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A module that is everything required to understands Druid Segments

There is a newer version: 30.0.1

/*
 * 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.druid.timeline.partition;

public final class PartitionIds
{
  /**
   * Start partitionId available for root generation segments.
   */
  public static final int ROOT_GEN_START_PARTITION_ID = 0;
  /**
   * End partitionId available for root generation segments.
   */
  public static final int ROOT_GEN_END_PARTITION_ID = 32768; // exclusive
  /**
   * Start partitionId available for non-root generation segments.
   */
  public static final int NON_ROOT_GEN_START_PARTITION_ID = 32768;
  /**
   * End partitionId available for non-root generation segments.
   */
  public static final int NON_ROOT_GEN_END_PARTITION_ID = 65536; // exclusive

  public static final short UNKNOWN_ATOMIC_UPDATE_GROUP_SIZE = -1;

  private PartitionIds()
  {
  }
}