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Allocation of new shards on remote store nodes
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.../java/org/opensearch/cluster/routing/allocation/decider/RemoteStoreAllocationDecider.java
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| /* | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| * | ||
| * The OpenSearch Contributors require contributions made to | ||
| * this file be licensed under the Apache-2.0 license or a | ||
| * compatible open source license. | ||
| */ | ||
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|
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| /* | ||
| * 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. | ||
| */ | ||
|
|
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| /* | ||
| * Modifications Copyright OpenSearch Contributors. See | ||
| * GitHub history for details. | ||
| */ | ||
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| package org.opensearch.cluster.routing.allocation.decider; | ||
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| import org.opensearch.cluster.routing.RoutingNode; | ||
| import org.opensearch.cluster.routing.ShardRouting; | ||
| import org.opensearch.cluster.routing.allocation.RoutingAllocation; | ||
| import org.opensearch.common.settings.ClusterSettings; | ||
| import org.opensearch.common.settings.Settings; | ||
| import org.opensearch.node.remotestore.RemoteStoreNodeService; | ||
| import org.opensearch.node.remotestore.RemoteStoreNodeService.Direction; | ||
| import org.opensearch.cluster.node.DiscoveryNode; | ||
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| /** | ||
| * An allocation decider to oversee shard allocation or relocation to remote-store enabled | ||
| * nodes. If Direction is set as "REMOTE_STORE", new primary shards can only go to remote-store enabled | ||
| * nodes. Replica shards can go to remote nodes only if corresponding primary also exists on a remote node. | ||
| * | ||
| * @opensearch.internal | ||
| */ | ||
| public class RemoteStoreAllocationDecider extends AllocationDecider { | ||
| public static final String NAME = "remote_store_enabled_cluster"; | ||
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| private Direction direction; | ||
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| public RemoteStoreAllocationDecider(Settings settings, ClusterSettings clusterSettings) { | ||
| this.direction = RemoteStoreNodeService.DIRECTION_SETTING.get(settings); | ||
| clusterSettings.addSettingsUpdateConsumer(RemoteStoreNodeService.DIRECTION_SETTING, this::setDirection); | ||
| } | ||
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| private void setDirection (Direction direction) { | ||
| this.direction = direction; | ||
| } | ||
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| @Override | ||
| public Decision canAllocate(ShardRouting shardRouting, RoutingNode node, RoutingAllocation allocation) { | ||
| DiscoveryNode targetNode = node.node(); | ||
| if (!shardRouting.assignedToNode()){ | ||
| if (shardRouting.primary()) { | ||
| if (direction.equals(Direction.REMOTE_STORE) && !targetNode.isRemoteStoreNode()) { | ||
| return allocation.decision(Decision.NO, NAME, | ||
| "for REMOTE_STORE direction, new primary shards can not be allocated to non-remote nodes"); | ||
| } | ||
| } | ||
| else { | ||
| ShardRouting primaryShardRouting = allocation.routingNodes().activePrimary(shardRouting.shardId()); | ||
| if (primaryShardRouting == null) { | ||
| // ReplicaAfterPrimaryActiveAllocationDecider should prevent this case from occurring | ||
| return allocation.decision(Decision.NO, NAME, "no active primary shard yet"); | ||
| } | ||
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| DiscoveryNode primaryShardNode = allocation.routingNodes() | ||
| .stream() | ||
| .filter(nd -> nd.nodeId().equals(primaryShardRouting.currentNodeId())) | ||
| .findFirst().get().node(); | ||
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| if (direction.equals(Direction.REMOTE_STORE)) { | ||
| if (!primaryShardNode.isRemoteStoreNode() && targetNode.isRemoteStoreNode()) { | ||
| return allocation.decision(Decision.NO, NAME, | ||
| "can not allocate replica shard on a remote node when primary shard is not already active on some remote node"); | ||
| } | ||
| } | ||
| } | ||
| return allocation.decision( | ||
| Decision.YES, | ||
| NAME, | ||
| "for %s direction, allocation of a %s shard is allowed on a %s", | ||
| direction, | ||
| (shardRouting.primary() ? "primary" : "replica"), | ||
| isRemoteStoreEnabled(targetNode) | ||
| ); | ||
| } | ||
| return allocation.decision(Decision.YES, NAME, "it is a relocation, returning YES for now"); | ||
| } | ||
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| private static String isRemoteStoreEnabled (DiscoveryNode node) { | ||
| return (node.isRemoteStoreNode() ? "remote_store_enabled" : "non_remote_store_enabled") + " node"; | ||
| } | ||
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| } |
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