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Refactor BalancedAllocator.Balancer to LocalShardsBalancer (opensearc…
…h-project#4761) * Refactor BalancedAllocator.Balancer to LocalShardsBalancer Signed-off-by: Kunal Kotwani <kkotwani@amazon.com> * Deprecate Balancer to maintain BWC Signed-off-by: Kunal Kotwani <kkotwani@amazon.com> Signed-off-by: Kunal Kotwani <kkotwani@amazon.com>
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967 changes: 31 additions & 936 deletions
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...ain/java/org/opensearch/cluster/routing/allocation/allocator/BalancedShardsAllocator.java
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...rc/main/java/org/opensearch/cluster/routing/allocation/allocator/LocalShardsBalancer.java
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server/src/main/java/org/opensearch/cluster/routing/allocation/allocator/ShardsBalancer.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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| package org.opensearch.cluster.routing.allocation.allocator; | ||
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| import org.opensearch.cluster.routing.ShardRouting; | ||
| import org.opensearch.cluster.routing.allocation.AllocateUnassignedDecision; | ||
| import org.opensearch.cluster.routing.allocation.MoveDecision; | ||
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| /** | ||
| * <p> | ||
| * A {@link ShardsBalancer} helps the {@link BalancedShardsAllocator} to perform allocation and balancing | ||
| * operations on the cluster. | ||
| * </p> | ||
| * | ||
| * @opensearch.internal | ||
| */ | ||
| public abstract class ShardsBalancer { | ||
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| /** | ||
| * Performs allocation of unassigned shards on nodes within the cluster. | ||
| */ | ||
| abstract void allocateUnassigned(); | ||
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| /** | ||
| * Moves shards that cannot be allocated to a node anymore. | ||
| */ | ||
| abstract void moveShards(); | ||
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| /** | ||
| * Balances the nodes on the cluster model. | ||
| */ | ||
| abstract void balance(); | ||
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| /** | ||
| * Make a decision for allocating an unassigned shard. | ||
| * @param shardRouting the shard for which the decision has to be made | ||
| * @return the allocation decision | ||
| */ | ||
| abstract AllocateUnassignedDecision decideAllocateUnassigned(ShardRouting shardRouting); | ||
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| /** | ||
| * Makes a decision on whether to move a started shard to another node. | ||
| * @param shardRouting the shard for which the decision has to be made | ||
| * @return a move decision for the shard | ||
| */ | ||
| abstract MoveDecision decideMove(ShardRouting shardRouting); | ||
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| /** | ||
| * Makes a decision about moving a single shard to a different node to form a more | ||
| * optimally balanced cluster. | ||
| * @param shardRouting the shard for which the move decision has to be made | ||
| * @return a move decision for the shard | ||
| */ | ||
| abstract MoveDecision decideRebalance(ShardRouting shardRouting); | ||
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| /** | ||
| * Returns the average of shards per node for the given index | ||
| */ | ||
| public float avgShardsPerNode() { | ||
| return Float.MAX_VALUE; | ||
| } | ||
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| /** | ||
| * Returns the global average of shards per node | ||
| */ | ||
| public float avgShardsPerNode(String index) { | ||
| return Float.MAX_VALUE; | ||
| } | ||
| } |
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