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Add allocation decider for mixed cluster during remote store migration (
opensearch-project#12505) Signed-off-by: Lakshya Taragi <lakshya.taragi@gmail.com>
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.../opensearch/cluster/routing/allocation/decider/RemoteStoreMigrationAllocationDecider.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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| /* | ||
| * 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.metadata.IndexMetadata; | ||
| import org.opensearch.cluster.node.DiscoveryNode; | ||
| 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.CompatibilityMode; | ||
| import org.opensearch.node.remotestore.RemoteStoreNodeService.Direction; | ||
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| import java.util.Locale; | ||
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| /** | ||
| * A new allocation decider for migration of document replication clusters to remote store backed clusters: | ||
| * - For STRICT compatibility mode, the decision is always YES | ||
| * - For remote store backed indices, relocation or allocation/relocation can only be towards a remote node | ||
| * - For "REMOTE_STORE" migration direction: | ||
| * - New primary shards can only be allocated to a remote node | ||
| * - New replica shards can be allocated to a remote node iff the primary has been migrated/allocated to a remote node | ||
| * - For other directions ("DOCREP", "NONE"), the decision is always YES | ||
| * | ||
| * @opensearch.internal | ||
| */ | ||
| public class RemoteStoreMigrationAllocationDecider extends AllocationDecider { | ||
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| public static final String NAME = "remote_store_migration"; | ||
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| private Direction migrationDirection; | ||
| private CompatibilityMode compatibilityMode; | ||
| private boolean remoteStoreBackedIndex; | ||
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| public RemoteStoreMigrationAllocationDecider(Settings settings, ClusterSettings clusterSettings) { | ||
| this.migrationDirection = RemoteStoreNodeService.MIGRATION_DIRECTION_SETTING.get(settings); | ||
| this.compatibilityMode = RemoteStoreNodeService.REMOTE_STORE_COMPATIBILITY_MODE_SETTING.get(settings); | ||
| clusterSettings.addSettingsUpdateConsumer(RemoteStoreNodeService.MIGRATION_DIRECTION_SETTING, this::setMigrationDirection); | ||
| clusterSettings.addSettingsUpdateConsumer( | ||
| RemoteStoreNodeService.REMOTE_STORE_COMPATIBILITY_MODE_SETTING, | ||
| this::setCompatibilityMode | ||
| ); | ||
| } | ||
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| private void setMigrationDirection(Direction migrationDirection) { | ||
| this.migrationDirection = migrationDirection; | ||
| } | ||
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| private void setCompatibilityMode(CompatibilityMode compatibilityMode) { | ||
| this.compatibilityMode = compatibilityMode; | ||
| } | ||
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| @Override | ||
| public Decision canAllocate(ShardRouting shardRouting, RoutingNode node, RoutingAllocation allocation) { | ||
| DiscoveryNode targetNode = node.node(); | ||
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| if (compatibilityMode.equals(CompatibilityMode.STRICT)) { | ||
| // assuming all nodes are of the same type (all remote or all non-remote) | ||
| return allocation.decision( | ||
| Decision.YES, | ||
| NAME, | ||
| getDecisionDetails(true, shardRouting, targetNode, " for strict compatibility mode") | ||
| ); | ||
| } | ||
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| if (migrationDirection.equals(Direction.REMOTE_STORE) == false) { | ||
| // docrep migration direction is currently not supported | ||
| return allocation.decision( | ||
| Decision.YES, | ||
| NAME, | ||
| getDecisionDetails(true, shardRouting, targetNode, " for non remote_store direction") | ||
| ); | ||
| } | ||
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| // check for remote store backed indices | ||
| IndexMetadata indexMetadata = allocation.metadata().getIndexSafe(shardRouting.index()); | ||
| if (IndexMetadata.INDEX_REMOTE_STORE_ENABLED_SETTING.exists(indexMetadata.getSettings())) { | ||
| remoteStoreBackedIndex = IndexMetadata.INDEX_REMOTE_STORE_ENABLED_SETTING.get(indexMetadata.getSettings()); | ||
| } | ||
| if (remoteStoreBackedIndex && targetNode.isRemoteStoreNode() == false) { | ||
| // allocations and relocations must be to a remote node | ||
| String reason = String.format( | ||
| Locale.ROOT, | ||
| " because a remote store backed index's shard copy can only be %s to a remote node", | ||
| ((shardRouting.assignedToNode() == false) ? "allocated" : "relocated") | ||
| ); | ||
| return allocation.decision(Decision.NO, NAME, getDecisionDetails(false, shardRouting, targetNode, reason)); | ||
| } | ||
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| if (shardRouting.primary()) { | ||
| return primaryShardDecision(shardRouting, targetNode, allocation); | ||
| } | ||
| return replicaShardDecision(shardRouting, targetNode, allocation); | ||
| } | ||
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| // handle scenarios for allocation of a new shard's primary copy | ||
| private Decision primaryShardDecision(ShardRouting primaryShardRouting, DiscoveryNode targetNode, RoutingAllocation allocation) { | ||
| if (targetNode.isRemoteStoreNode() == false) { | ||
| return allocation.decision(Decision.NO, NAME, getDecisionDetails(false, primaryShardRouting, targetNode, "")); | ||
| } | ||
| return allocation.decision(Decision.YES, NAME, getDecisionDetails(true, primaryShardRouting, targetNode, "")); | ||
| } | ||
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| private Decision replicaShardDecision(ShardRouting replicaShardRouting, DiscoveryNode targetNode, RoutingAllocation allocation) { | ||
| if (targetNode.isRemoteStoreNode()) { | ||
| ShardRouting primaryShardRouting = allocation.routingNodes().activePrimary(replicaShardRouting.shardId()); | ||
| boolean primaryHasMigratedToRemote = false; | ||
| if (primaryShardRouting != null) { | ||
| DiscoveryNode primaryShardNode = allocation.nodes().getNodes().get(primaryShardRouting.currentNodeId()); | ||
| primaryHasMigratedToRemote = primaryShardNode.isRemoteStoreNode(); | ||
| } | ||
| if (primaryHasMigratedToRemote == false) { | ||
| return allocation.decision( | ||
| Decision.NO, | ||
| NAME, | ||
| getDecisionDetails(false, replicaShardRouting, targetNode, " since primary shard copy is not yet migrated to remote") | ||
| ); | ||
| } | ||
| return allocation.decision( | ||
| Decision.YES, | ||
| NAME, | ||
| getDecisionDetails(true, replicaShardRouting, targetNode, " since primary shard copy has been migrated to remote") | ||
| ); | ||
| } | ||
| return allocation.decision(Decision.YES, NAME, getDecisionDetails(true, replicaShardRouting, targetNode, "")); | ||
| } | ||
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| // get detailed reason for the decision | ||
| private String getDecisionDetails(boolean isYes, ShardRouting shardRouting, DiscoveryNode targetNode, String reason) { | ||
| return String.format( | ||
| Locale.ROOT, | ||
| "[%s migration_direction]: %s shard copy %s be %s to a %s node%s", | ||
| migrationDirection.direction, | ||
| (shardRouting.primary() ? "primary" : "replica"), | ||
| (isYes ? "can" : "can not"), | ||
| ((shardRouting.assignedToNode() == false) ? "allocated" : "relocated"), | ||
| (targetNode.isRemoteStoreNode() ? "remote" : "non-remote"), | ||
| reason | ||
| ); | ||
| } | ||
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| } |
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