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Signed-off-by: Prudhvi Godithi <[email protected]>
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115 changes: 115 additions & 0 deletions
115
.../opensearch/cluster/routing/allocation/decider/RemoveIndexingShardsAllocationDecider.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| /* | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| */ | ||
| package org.opensearch.cluster.routing.allocation.decider; | ||
|
|
||
| import org.apache.logging.log4j.LogManager; | ||
| import org.apache.logging.log4j.Logger; | ||
| import org.opensearch.cluster.metadata.IndexMetadata; | ||
| import org.opensearch.cluster.routing.RoutingNode; | ||
| import org.opensearch.cluster.routing.ShardRouting; | ||
| import org.opensearch.cluster.routing.allocation.RoutingAllocation; | ||
|
|
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| public class RemoveIndexingShardsAllocationDecider extends AllocationDecider { | ||
| private static final Logger logger = LogManager.getLogger(RemoveIndexingShardsAllocationDecider.class); | ||
|
|
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| public static final String NAME = "remove_indexing_shards"; | ||
|
|
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| @Override | ||
| public Decision canAllocate(ShardRouting shardRouting, RoutingNode node, RoutingAllocation allocation) { | ||
| IndexMetadata indexMetadata = allocation.metadata().getIndexSafe(shardRouting.index()); | ||
| boolean removeIndexingShardsEnabled = indexMetadata.getSettings().getAsBoolean("index.remove_indexing_shards.enabled", false); | ||
|
|
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| logger.debug("[canAllocate] Shard [{}] on node [{}], removeIndexingShards=[{}], searchOnly=[{}], settings={}", | ||
| shardRouting.shardId(), | ||
| node.nodeId(), | ||
| removeIndexingShardsEnabled, | ||
| shardRouting.isSearchOnly(), | ||
| indexMetadata.getSettings().toString() | ||
| ); | ||
|
|
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| if (!removeIndexingShardsEnabled) { | ||
| return allocation.decision(Decision.YES, NAME, "remove indexing shards is not enabled"); | ||
| } | ||
|
|
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| // Only allow search replica allocation when remove_indexing_shards is enabled | ||
| if (!shardRouting.primary() && shardRouting.isSearchOnly()) { | ||
| return allocation.decision(Decision.YES, NAME, "search replicas are allowed"); | ||
| } | ||
|
|
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| return allocation.decision(Decision.NO, NAME, "remove indexing shards enabled: only search replicas allowed"); | ||
| } | ||
|
|
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| @Override | ||
| public Decision canRemain(ShardRouting shardRouting, RoutingNode node, RoutingAllocation allocation) { | ||
| IndexMetadata indexMetadata = allocation.metadata().getIndexSafe(shardRouting.index()); | ||
| boolean removeIndexingShardsEnabled = indexMetadata.getSettings().getAsBoolean("index.remove_indexing_shards.enabled", false); | ||
|
|
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| logger.debug("[canRemain] Shard [{}] on node [{}], removeIndexingShards=[{}], searchOnly=[{}], settings={}", | ||
| shardRouting.shardId(), | ||
| node.nodeId(), | ||
| removeIndexingShardsEnabled, | ||
| shardRouting.isSearchOnly(), | ||
| indexMetadata.getSettings().toString() | ||
| ); | ||
|
|
||
| if (!removeIndexingShardsEnabled) { | ||
| return allocation.decision(Decision.YES, NAME, "remove indexing shards is not enabled"); | ||
| } | ||
|
|
||
| // When remove_indexing_shards is enabled: To remove primary shards | ||
| if (shardRouting.primary()) { | ||
| if (hasHealthySearchReplicas(shardRouting, allocation)) { | ||
| logger.info("Forcing removal of primary shard [{}] as search replicas are healthy", shardRouting.shardId()); | ||
| return allocation.decision(Decision.NO, NAME, "removing primary with healthy search replicas"); | ||
| } | ||
| return allocation.decision(Decision.NO, NAME, "primary must be removed when remove_indexing_shards is enabled"); | ||
| } | ||
|
|
||
| //Allow only search replicas to remain | ||
| if (shardRouting.isSearchOnly()) { | ||
| return allocation.decision(Decision.YES, NAME, "search replicas are allowed"); | ||
| } | ||
|
|
||
| //Remove regular replicas | ||
| logger.info("Forcing removal of regular replica shard [{}]", shardRouting.shardId()); | ||
| return allocation.decision(Decision.NO, NAME, "regular replicas must be removed"); | ||
| } | ||
|
|
||
| @Override | ||
| public Decision canRebalance(RoutingAllocation allocation) { | ||
| boolean hasRemoveIndexingShardsIndex = allocation.metadata().indices().values().stream() | ||
| .anyMatch(idx -> idx.getSettings().getAsBoolean("index.remove_indexing_shards.enabled", false)); | ||
|
|
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| if (hasRemoveIndexingShardsIndex) { | ||
| logger.info("Allowing rebalancing to facilitate remove indexing shards"); | ||
| return allocation.decision(Decision.YES, NAME, "allowing rebalance for remove indexing shards"); | ||
| } | ||
|
|
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| return Decision.ALWAYS; | ||
| } | ||
|
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| @Override | ||
| public Decision canMoveAway(ShardRouting shardRouting, RoutingAllocation allocation) { | ||
| IndexMetadata indexMetadata = allocation.metadata().getIndexSafe(shardRouting.index()); | ||
| boolean removeIndexingShardsEnabled = indexMetadata.getSettings().getAsBoolean("index.remove_indexing_shards.enabled", false); | ||
|
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| if (removeIndexingShardsEnabled && !shardRouting.isSearchOnly()) { | ||
| logger.info("Forcing non-search shard [{}] to move away", shardRouting.shardId()); | ||
| return allocation.decision(Decision.YES, NAME, "must move away non-search shards"); | ||
| } | ||
|
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| return Decision.ALWAYS; | ||
| } | ||
|
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| private boolean hasHealthySearchReplicas(ShardRouting shardRouting, RoutingAllocation allocation) { | ||
| boolean hasHealthy = allocation.routingTable() | ||
| .shardRoutingTable(shardRouting.shardId()) | ||
| .activeShards() | ||
| .stream() | ||
| .anyMatch(shard -> !shard.primary() && shard.isSearchOnly() && shard.active()); | ||
|
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| logger.debug("Search replica check for shard [{}]: hasHealthy=[{}]", shardRouting.shardId(), hasHealthy); | ||
| return hasHealthy; | ||
| } | ||
| } |
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