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Add changes to block non-paginated calls in cat shards, indices and s…
…egments Signed-off-by: Sumit Bansal <sumitsb@amazon.com>
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149 changes: 149 additions & 0 deletions
149
server/src/main/java/org/opensearch/rest/RequestLimitSettings.java
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|---|---|---|
| @@ -0,0 +1,149 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
|
|
||
| package org.opensearch.rest; | ||
|
|
||
| import org.opensearch.cluster.ClusterState; | ||
| import org.opensearch.cluster.routing.IndexRoutingTable; | ||
| import org.opensearch.cluster.routing.IndexShardRoutingTable; | ||
| import org.opensearch.cluster.routing.RoutingTable; | ||
| import org.opensearch.common.settings.ClusterSettings; | ||
| import org.opensearch.common.settings.Setting; | ||
| import org.opensearch.common.settings.Settings; | ||
| import org.opensearch.rest.action.cat.RestIndicesAction; | ||
| import org.opensearch.rest.action.cat.RestSegmentsAction; | ||
| import org.opensearch.rest.action.cat.RestShardsAction; | ||
|
|
||
| import java.util.Map; | ||
| import java.util.Objects; | ||
| import java.util.function.Supplier; | ||
|
|
||
| /** | ||
| * Class to define dynamic settings for putting circuit breakers on the actions and functions to evaluate if block is required. | ||
| */ | ||
| public class RequestLimitSettings { | ||
|
|
||
| /** | ||
| * Enum to represent action names against whom we need to perform limit checks. | ||
| */ | ||
| public enum BlockAction { | ||
| CAT_INDICES, | ||
| CAT_SHARDS, | ||
| CAT_SEGMENTS | ||
| } | ||
|
|
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| private volatile int catIndicesLimit; | ||
| private volatile int catShardsLimit; | ||
| private volatile int catSegmentsLimit; | ||
|
|
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| /** | ||
| * Setting to enable circuit breaker on {@link RestIndicesAction}. The limit will be applied on number of indices. | ||
| */ | ||
| public static final Setting<Integer> CAT_INDICES_LIMIT_SETTING = Setting.intSetting( | ||
| "cat.indices.limit", | ||
| -1, | ||
| Setting.Property.NodeScope, | ||
| Setting.Property.Dynamic | ||
| ); | ||
|
|
||
| /** | ||
| * Setting to enable circuit breaker on {@link RestShardsAction}. The limit will be applied on number of shards. | ||
| */ | ||
| public static final Setting<Integer> CAT_SHARDS_LIMIT_SETTING = Setting.intSetting( | ||
| "cat.shards.limit", | ||
| -1, | ||
| Setting.Property.NodeScope, | ||
| Setting.Property.Dynamic | ||
| ); | ||
|
|
||
| /** | ||
| * Setting to enable circuit breaker on {@link RestSegmentsAction}. The limit will be applied on number of indices. | ||
| */ | ||
| public static final Setting<Integer> CAT_SEGMENTS_LIMIT_SETTING = Setting.intSetting( | ||
| "cat.segments.limit", | ||
| -1, | ||
| Setting.Property.NodeScope, | ||
| Setting.Property.Dynamic | ||
| ); | ||
|
|
||
| public RequestLimitSettings(ClusterSettings clusterSettings, Settings settings) { | ||
| setCatShardsLimitSetting(CAT_SHARDS_LIMIT_SETTING.get(settings)); | ||
| setCatIndicesLimitSetting(CAT_INDICES_LIMIT_SETTING.get(settings)); | ||
| setCatSegmentsLimitSetting(CAT_SEGMENTS_LIMIT_SETTING.get(settings)); | ||
|
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| clusterSettings.addSettingsUpdateConsumer(CAT_SHARDS_LIMIT_SETTING, this::setCatShardsLimitSetting); | ||
| clusterSettings.addSettingsUpdateConsumer(CAT_INDICES_LIMIT_SETTING, this::setCatIndicesLimitSetting); | ||
| clusterSettings.addSettingsUpdateConsumer(CAT_SEGMENTS_LIMIT_SETTING, this::setCatSegmentsLimitSetting); | ||
| } | ||
|
|
||
| /** | ||
| * Method to check if the circuit breaker limit has reached for an action. | ||
| * The limits are controlled via dynamic settings. | ||
| * | ||
| * @param clusterState {@link ClusterState} | ||
| * @param actionToCheck {@link BlockAction} | ||
| * @return True/False | ||
| */ | ||
| public boolean isCircuitLimitBreached(final ClusterState clusterState, final BlockAction actionToCheck) { | ||
| if (Objects.isNull(clusterState)) return false; | ||
| switch (actionToCheck) { | ||
| case CAT_INDICES: | ||
| if (catIndicesLimit <= 0) return false; | ||
| int indicesCount = getTotalIndices(clusterState); | ||
| if (indicesCount > catIndicesLimit) return true; | ||
| break; | ||
| case CAT_SHARDS: | ||
| if (catShardsLimit <= 0) return false; | ||
| int totalShards = getTotalShards(clusterState); | ||
| if (totalShards > catShardsLimit) return true; | ||
| break; | ||
| case CAT_SEGMENTS: | ||
| if (catSegmentsLimit <= 0) return false; | ||
| if (getTotalIndices(clusterState) > catSegmentsLimit) return true; | ||
| break; | ||
| } | ||
| return false; | ||
| } | ||
|
|
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| private void setCatShardsLimitSetting(final int catShardsLimit) { | ||
| this.catShardsLimit = catShardsLimit; | ||
| } | ||
|
|
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| private void setCatIndicesLimitSetting(final int catIndicesLimit) { | ||
| this.catIndicesLimit = catIndicesLimit; | ||
| } | ||
|
|
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| private void setCatSegmentsLimitSetting(final int catSegmentsLimit) { | ||
| this.catSegmentsLimit = catSegmentsLimit; | ||
| } | ||
|
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| private static int getTotalIndices(final ClusterState clusterState) { | ||
| return chainWalk(() -> clusterState.getMetadata().getIndices().size(), 0); | ||
| } | ||
|
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| private static int getTotalShards(final ClusterState clusterState) { | ||
| final RoutingTable routingTable = clusterState.getRoutingTable(); | ||
| final Map<String, IndexRoutingTable> indexRoutingTableMap = routingTable.getIndicesRouting(); | ||
| int totalShards = 0; | ||
| for (final Map.Entry<String, IndexRoutingTable> entry : indexRoutingTableMap.entrySet()) { | ||
| for (final Map.Entry<Integer, IndexShardRoutingTable> indexShardRoutingTableEntry : entry.getValue().getShards().entrySet()) { | ||
| totalShards += indexShardRoutingTableEntry.getValue().getShards().size(); | ||
| } | ||
| } | ||
| return totalShards; | ||
| } | ||
|
|
||
| // TODO: Evaluate if we can move this to common util. | ||
| private static <T> T chainWalk(Supplier<T> supplier, T defaultValue) { | ||
| try { | ||
| return supplier.get(); | ||
| } catch (NullPointerException e) { | ||
| return defaultValue; | ||
| } | ||
| } | ||
| } |
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