| /* |
| * 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; |
| |
| import com.google.inject.BindingAnnotation; |
| |
| import java.lang.annotation.ElementType; |
| import java.lang.annotation.Retention; |
| import java.lang.annotation.RetentionPolicy; |
| import java.lang.annotation.Target; |
| |
| /** |
| * This annnotation is used to inject a boolean parameter into a {@link DataSegment} constructor, which prescribes to |
| * drop deserialized "lastCompactionState" and don't store it in a field of a {@link DataSegment}. |
| * "lastCompactionState" is used only on the coordinator, peons, and indexers. |
| * |
| * - In auto compaction of the coordinator, "lastCompactionState" is used to determine whether the given |
| * segment needs further compaction or not. |
| * - In Metadata store information API of the coordinator, "lastCompactionState" is part of the sys.segments table |
| * - In parallel indexing, "lastCompactionState" should be serialized and deserialized properly when |
| * the sub tasks report the pushed segments to the supervisor task. |
| */ |
| @Target({ElementType.PARAMETER, ElementType.FIELD}) |
| @Retention(RetentionPolicy.RUNTIME) |
| @BindingAnnotation |
| public @interface PruneLastCompactionState |
| { |
| } |