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Elasticsearch subproject :server
/*
* Licensed to Elasticsearch 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.
*/
package org.elasticsearch.cluster.metadata;
import org.elasticsearch.common.Booleans;
import org.elasticsearch.common.settings.Setting;
import org.elasticsearch.common.settings.Setting.Property;
/**
* This class acts as a functional wrapper around the index.auto_expand_replicas setting.
* This setting or rather it's value is expanded into a min and max value which requires special handling
* based on the number of datanodes in the cluster. This class handles all the parsing and streamlines the access to these values.
*/
final class AutoExpandReplicas {
// the value we recognize in the "max" position to mean all the nodes
private static final String ALL_NODES_VALUE = "all";
public static final Setting SETTING = new Setting<>(IndexMetaData.SETTING_AUTO_EXPAND_REPLICAS, "false", (value) -> {
final int min;
final int max;
if (Booleans.parseBoolean(value, true) == false) {
return new AutoExpandReplicas(0, 0, false);
}
final int dash = value.indexOf('-');
if (-1 == dash) {
throw new IllegalArgumentException("failed to parse [" + IndexMetaData.SETTING_AUTO_EXPAND_REPLICAS + "] from value: [" + value + "] at index " + dash);
}
final String sMin = value.substring(0, dash);
try {
min = Integer.parseInt(sMin);
} catch (NumberFormatException e) {
throw new IllegalArgumentException("failed to parse [" + IndexMetaData.SETTING_AUTO_EXPAND_REPLICAS + "] from value: [" + value + "] at index " + dash, e);
}
String sMax = value.substring(dash + 1);
if (sMax.equals(ALL_NODES_VALUE)) {
max = Integer.MAX_VALUE;
} else {
try {
max = Integer.parseInt(sMax);
} catch (NumberFormatException e) {
throw new IllegalArgumentException("failed to parse [" + IndexMetaData.SETTING_AUTO_EXPAND_REPLICAS + "] from value: [" + value + "] at index " + dash, e);
}
}
return new AutoExpandReplicas(min, max, true);
}, Property.Dynamic, Property.IndexScope);
private final int minReplicas;
private final int maxReplicas;
private final boolean enabled;
private AutoExpandReplicas(int minReplicas, int maxReplicas, boolean enabled) {
if (minReplicas > maxReplicas) {
throw new IllegalArgumentException("[" + IndexMetaData.SETTING_AUTO_EXPAND_REPLICAS + "] minReplicas must be =< maxReplicas but wasn't " + minReplicas + " > " + maxReplicas);
}
this.minReplicas = minReplicas;
this.maxReplicas = maxReplicas;
this.enabled = enabled;
}
int getMinReplicas() {
return minReplicas;
}
int getMaxReplicas(int numDataNodes) {
return Math.min(maxReplicas, numDataNodes-1);
}
@Override
public String toString() {
return enabled ? minReplicas + "-" + maxReplicas : "false";
}
boolean isEnabled() {
return enabled;
}
}