| /** |
| * 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.hadoop.yarn.server.resourcemanager.placement; |
| |
| import org.apache.hadoop.yarn.exceptions.YarnException; |
| |
| /** |
| * Mapping rule represents a single mapping setting defined by the user. All |
| * rules have matchers and actions. Matcher determine if a mapping rule applies |
| * to a given applicationSubmission, while action represent the course of action |
| * we need to take when a rule applies. |
| * |
| * MappingRules also support fallback actions, which will be evaluated when the |
| * main action fails due to any reason (Eg. trying to place to a queue which |
| * does not exist) |
| */ |
| public class MappingRule { |
| public static final String USER_MAPPING = "u"; |
| public static final String GROUP_MAPPING = "g"; |
| public static final String APPLICATION_MAPPING = "a"; |
| private final MappingRuleMatcher matcher; |
| private final MappingRuleAction action; |
| |
| public MappingRule(MappingRuleMatcher matcher, MappingRuleAction action) { |
| this.matcher = matcher; |
| this.action = action; |
| } |
| |
| /** |
| * This method evaluates the rule, and returns the MappingRuleResult, if |
| * the rule matches, skip action otherwise. |
| * @param variables The variable context, which contains all the variables |
| * @return The rule's result or skip action if the rule doesn't apply |
| */ |
| public MappingRuleResult evaluate(VariableContext variables) { |
| if (matcher.match(variables)) { |
| return action.execute(variables); |
| } |
| |
| return MappingRuleResult.createSkipResult(); |
| } |
| |
| /** |
| * Returns the associated action's fallback. |
| * @return The fallback of the action |
| */ |
| public MappingRuleResult getFallback() { |
| return action.getFallback(); |
| } |
| |
| /** |
| * Creates a MappingRule object from the legacy style configuration. The |
| * configuration is a [TYPE]:SOURCE:PATH (eg. u:bob:root.users.%user). |
| * Using the source and path parts of the legacy rule, this method will |
| * create an application MappingRule which behaves as the legacy rule defined. |
| * This version of the method does not require type, since legacy application |
| * mappings omitted the 'a', so this method is to be used for those rules, |
| * which in all case are application mappings. |
| * @param source This part of the rule determines which applications the rule |
| * will be applied |
| * @param path The path where the application is to be placed |
| * @return MappingRule based on the provided settings |
| */ |
| public static MappingRule createLegacyRule(String source, String path) { |
| return createLegacyRule(APPLICATION_MAPPING, source, path); |
| } |
| |
| /** |
| * Creates a MappingRule object from the legacy style configuration. The |
| * configuration is a [TYPE]:SOURCE:PATH (eg. u:bob:root.users.%user). |
| * Using the type, source and path parts of the legacy rule, this method will |
| * create a MappingRule which behaves as the legacy rule defined. |
| * @param type The type of the rule, can be |
| * 'u' for user mapping, 'g' for group mapping or |
| * 'a' for application mapping |
| * @param source This part of the rule determines which submissions this rule |
| * should apply to (eg. if type is 'u', source will match |
| * against the user name) |
| * @param path The path where the application is to be placed |
| * @return MappingRule based on the provided settings |
| */ |
| public static MappingRule createLegacyRule( |
| String type, String source, String path) { |
| MappingRuleMatcher matcher; |
| MappingRuleAction action = MappingRuleActions.createPlaceToQueueAction( |
| path, true); |
| //While legacy rule fallback handling is a bit inconsistent, the most cases |
| //it fall back to default queue placement, so this is the best approximation |
| action.setFallbackDefaultPlacement(); |
| |
| switch (type) { |
| case USER_MAPPING: |
| if (source.equals("%user")) { |
| matcher = MappingRuleMatchers.createAllMatcher(); |
| } else { |
| matcher = MappingRuleMatchers.createUserMatcher(source); |
| } |
| break; |
| case GROUP_MAPPING: |
| matcher = MappingRuleMatchers.createUserGroupMatcher(source); |
| break; |
| case APPLICATION_MAPPING: |
| matcher = MappingRuleMatchers.createApplicationNameMatcher(source); |
| break; |
| default: |
| throw new IllegalArgumentException("Invalid mapping rule type '" + |
| type + "'"); |
| } |
| |
| return new MappingRule(matcher, action); |
| } |
| |
| public void validate(MappingRuleValidationContext ctx) |
| throws YarnException { |
| this.action.validate(ctx); |
| } |
| |
| @Override |
| public String toString() { |
| return "MappingRule{" + |
| "matcher=" + matcher + |
| ", action=" + action + |
| '}'; |
| } |
| } |