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improve allocation decision to allow to explain why a decision has be…
…en made building the infra to support explaining why an allocation decision has been made, for example, why a shard is not allocated on a specific node
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107 changes: 107 additions & 0 deletions
107
src/main/java/org/elasticsearch/cluster/routing/allocation/decider/Decision.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| /* | ||
| * Licensed to ElasticSearch and Shay Banon under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. ElasticSearch 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. | ||
| */ | ||
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| package org.elasticsearch.cluster.routing.allocation.decider; | ||
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| import com.google.common.collect.Lists; | ||
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| import java.util.List; | ||
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| /** | ||
| */ | ||
| public abstract class Decision { | ||
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| public static final Decision ALWAYS = new Single(Type.YES); | ||
| public static final Decision YES = new Single(Type.YES); | ||
| public static final Decision NO = new Single(Type.NO); | ||
| public static final Decision THROTTLE = new Single(Type.THROTTLE); | ||
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| public static Decision single(Type type, String explanation, Object... explanationParams) { | ||
| return new Single(type, explanation, explanationParams); | ||
| } | ||
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| public static enum Type { | ||
| YES, | ||
| NO, | ||
| THROTTLE | ||
| } | ||
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| public abstract Type type(); | ||
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| public static class Single extends Decision { | ||
| private final Type type; | ||
| private final String explanation; | ||
| private final Object[] explanationParams; | ||
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| public Single(Type type) { | ||
| this(type, null, (Object[]) null); | ||
| } | ||
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| public Single(Type type, String explanation, Object... explanationParams) { | ||
| this.type = type; | ||
| this.explanation = explanation; | ||
| this.explanationParams = explanationParams; | ||
| } | ||
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| public Type type() { | ||
| return this.type; | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| if (explanation == null) { | ||
| return type + "()"; | ||
| } | ||
| return type + "(" + String.format(explanation, explanationParams) + ")"; | ||
| } | ||
| } | ||
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| public static class Multi extends Decision { | ||
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| private final List<Decision> decisions = Lists.newArrayList(); | ||
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| public Multi add(Decision decision) { | ||
| decisions.add(decision); | ||
| return this; | ||
| } | ||
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| @Override | ||
| public Type type() { | ||
| Type ret = Type.YES; | ||
| for (int i = 0; i < decisions.size(); i++) { | ||
| Type type = decisions.get(i).type(); | ||
| if (type == Type.NO) { | ||
| return type; | ||
| } else if (type == Type.THROTTLE) { | ||
| ret = type; | ||
| } | ||
| } | ||
| return ret; | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| StringBuilder sb = new StringBuilder(); | ||
| for (Decision decision : decisions) { | ||
| sb.append("[").append(decision.toString()).append("]"); | ||
| } | ||
| return sb.toString(); | ||
| } | ||
| } | ||
| } |
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