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pandeydivyansh1803Divyansh Pandey
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Divyansh Pandey
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Add new index and cluster level settings to limit the total primary shards per node and per index (#17295)
* Added a new index level setting to limit the total primary shards per index per node. Added relevant files for unit test and integration test. Signed-off-by: Divyansh Pandey <[email protected]> * update files for code quality Signed-off-by: Divyansh Pandey <[email protected]> * moved primary shard count function to RoutingNode.java Signed-off-by: Divyansh Pandey <[email protected]> * removed unwanted files Signed-off-by: Divyansh Pandey <[email protected]> * added cluster level setting to limit total primary shards per node Signed-off-by: Divyansh Pandey <[email protected]> * allow the index level settings to be applied to both DOCUMENT and SEGMENT replication indices Signed-off-by: Divyansh Pandey <[email protected]> * Added necessary validator to restrict the index and cluster level primary shards per node settings only for remote store enabled cluster. Added relevant unit and integration tests. Signed-off-by: Divyansh Pandey <[email protected]> * refactoring changes Signed-off-by: Divyansh Pandey <[email protected]> * refactoring changes Signed-off-by: Divyansh Pandey <[email protected]> * Empty commit to rerun gradle test Signed-off-by: Divyansh Pandey <[email protected]> * optimised the calculation of total primary shards on a node Signed-off-by: Divyansh Pandey <[email protected]> * Refactoring changes Signed-off-by: Divyansh Pandey <[email protected]> * refactoring changes, added TODO to MetadataCreateIndexService Signed-off-by: Divyansh Pandey <[email protected]> * Added integration test for scenario where primary shards setting is set for cluster which is not remote store enabled Signed-off-by: Divyansh Pandey <[email protected]> --------- Signed-off-by: Divyansh Pandey <[email protected]> Signed-off-by: Divyansh Pandey <[email protected]> Co-authored-by: Divyansh Pandey <[email protected]>
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‎CHANGELOG-3.0.md

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@@ -17,6 +17,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
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- Add systemd configurations to strengthen OS core security ([#17107](https://github.com/opensearch-project/OpenSearch/pull/17107))
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- Added pull-based Ingestion (APIs, for ingestion source, a Kafka plugin, and IngestionEngine that pulls data from the ingestion source) ([#16958](https://github.com/opensearch-project/OpenSearch/pull/16958))
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- Added ConfigurationUtils to core for the ease of configuration parsing [#17223](https://github.com/opensearch-project/OpenSearch/pull/17223)
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- Add cluster and index level settings to limit the total primary shards per node and per index [#17295](https://github.com/opensearch-project/OpenSearch/pull/17295)
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- Add execution_hint to cardinality aggregator request (#[17312](https://github.com/opensearch-project/OpenSearch/pull/17312))
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- Arrow Flight RPC plugin with Flight server bootstrap logic and client for internode communication ([#16962](https://github.com/opensearch-project/OpenSearch/pull/16962))
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- Added offset management for the pull-based Ingestion ([#17354](https://github.com/opensearch-project/OpenSearch/pull/17354))

‎server/src/internalClusterTest/java/org/opensearch/cluster/routing/allocation/decider/ShardsLimitAllocationDeciderIT.java

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/*
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* SPDX-License-Identifier: Apache-2.0
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*
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* The OpenSearch Contributors require contributions made to
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* this file be licensed under the Apache-2.0 license or a
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* compatible open source license.
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*/
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package org.opensearch.cluster.routing.allocation.decider;
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import org.opensearch.cluster.ClusterState;
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import org.opensearch.cluster.routing.IndexRoutingTable;
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import org.opensearch.cluster.routing.IndexShardRoutingTable;
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import org.opensearch.cluster.routing.RoutingNode;
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import org.opensearch.cluster.routing.ShardRouting;
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import org.opensearch.cluster.routing.ShardRoutingState;
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import org.opensearch.common.settings.Settings;
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import org.opensearch.test.OpenSearchIntegTestCase;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import static org.opensearch.cluster.metadata.IndexMetadata.SETTING_NUMBER_OF_REPLICAS;
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import static org.opensearch.cluster.metadata.IndexMetadata.SETTING_NUMBER_OF_SHARDS;
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import static org.opensearch.cluster.routing.allocation.decider.ShardsLimitAllocationDecider.CLUSTER_TOTAL_PRIMARY_SHARDS_PER_NODE_SETTING;
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import static org.opensearch.cluster.routing.allocation.decider.ShardsLimitAllocationDecider.CLUSTER_TOTAL_SHARDS_PER_NODE_SETTING;
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import static org.opensearch.cluster.routing.allocation.decider.ShardsLimitAllocationDecider.INDEX_TOTAL_PRIMARY_SHARDS_PER_NODE_SETTING;
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import static org.opensearch.cluster.routing.allocation.decider.ShardsLimitAllocationDecider.INDEX_TOTAL_SHARDS_PER_NODE_SETTING;
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@OpenSearchIntegTestCase.ClusterScope(scope = OpenSearchIntegTestCase.Scope.TEST, numDataNodes = 3)
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public class ShardsLimitAllocationDeciderIT extends OpenSearchIntegTestCase {
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@Override
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protected Settings nodeSettings(int nodeOrdinal) {
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return Settings.builder().put(super.nodeSettings(nodeOrdinal)).build();
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}
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public void testClusterWideShardsLimit() {
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// Set the cluster-wide shard limit to 2
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updateClusterSetting(CLUSTER_TOTAL_SHARDS_PER_NODE_SETTING.getKey(), 4);
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// Create the first two indices with 3 shards and 1 replica each
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createIndex("test1", Settings.builder().put(SETTING_NUMBER_OF_SHARDS, 3).put(SETTING_NUMBER_OF_REPLICAS, 1).build());
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createIndex("test2", Settings.builder().put(SETTING_NUMBER_OF_SHARDS, 3).put(SETTING_NUMBER_OF_REPLICAS, 1).build());
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// Create the third index with 2 shards and 1 replica
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createIndex("test3", Settings.builder().put(SETTING_NUMBER_OF_SHARDS, 2).put(SETTING_NUMBER_OF_REPLICAS, 1).build());
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// Wait for the shard limit to be applied
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try {
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assertBusy(() -> {
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ClusterState state = client().admin().cluster().prepareState().get().getState();
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// Check total number of shards
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assertEquals(16, state.getRoutingTable().allShards().size());
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// Check number of unassigned shards
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int unassignedShards = state.getRoutingTable().shardsWithState(ShardRoutingState.UNASSIGNED).size();
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assertEquals(4, unassignedShards);
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// Check shard distribution across nodes
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for (RoutingNode routingNode : state.getRoutingNodes()) {
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assertTrue("Node exceeds shard limit", routingNode.numberOfOwningShards() <= 4);
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}
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});
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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// Additional assertions to verify shard distribution
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ClusterState state = client().admin().cluster().prepareState().get().getState();
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int totalAssignedShards = 0;
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for (RoutingNode routingNode : state.getRoutingNodes()) {
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totalAssignedShards += routingNode.numberOfOwningShards();
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}
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assertEquals("Total assigned shards should be 12", 12, totalAssignedShards);
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}
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public void testIndexSpecificShardLimit() {
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// Set the index-specific shard limit to 2 for the first index only
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Settings indexSettingsWithLimit = Settings.builder()
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.put(SETTING_NUMBER_OF_SHARDS, 4)
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.put(SETTING_NUMBER_OF_REPLICAS, 1)
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.put(INDEX_TOTAL_SHARDS_PER_NODE_SETTING.getKey(), 2)
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.build();
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Settings indexSettingsWithoutLimit = Settings.builder().put(SETTING_NUMBER_OF_SHARDS, 4).put(SETTING_NUMBER_OF_REPLICAS, 1).build();
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// Create the first index with 4 shards, 1 replica, and the index-specific limit
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createIndex("test1", indexSettingsWithLimit);
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// Create the second index with 4 shards and 1 replica, without the index-specific limit
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createIndex("test2", indexSettingsWithoutLimit);
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// Create the third index with 3 shards and 1 replica, without the index-specific limit
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createIndex("test3", Settings.builder().put(SETTING_NUMBER_OF_SHARDS, 3).put(SETTING_NUMBER_OF_REPLICAS, 1).build());
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try {
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// Wait for the shard limit to be applied
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assertBusy(() -> {
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ClusterState state = client().admin().cluster().prepareState().get().getState();
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// Check total number of shards
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assertEquals(22, state.getRoutingTable().allShards().size());
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// Check total number of assigned and unassigned shards
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int totalAssignedShards = 0;
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int totalUnassignedShards = 0;
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Map<String, Integer> unassignedShardsByIndex = new HashMap<>();
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for (IndexRoutingTable indexRoutingTable : state.getRoutingTable()) {
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String index = indexRoutingTable.getIndex().getName();
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int indexUnassignedShards = 0;
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for (IndexShardRoutingTable shardRoutingTable : indexRoutingTable) {
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for (ShardRouting shardRouting : shardRoutingTable) {
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if (shardRouting.unassigned()) {
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totalUnassignedShards++;
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indexUnassignedShards++;
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} else {
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totalAssignedShards++;
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}
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}
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}
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unassignedShardsByIndex.put(index, indexUnassignedShards);
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}
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assertEquals("Total assigned shards should be 20", 20, totalAssignedShards);
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assertEquals("Total unassigned shards should be 2", 2, totalUnassignedShards);
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// Check unassigned shards for each index
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assertEquals("test1 should have 2 unassigned shards", 2, unassignedShardsByIndex.get("test1").intValue());
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assertEquals("test2 should have 0 unassigned shards", 0, unassignedShardsByIndex.get("test2").intValue());
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assertEquals("test3 should have 0 unassigned shards", 0, unassignedShardsByIndex.get("test3").intValue());
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});
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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public void testCombinedClusterAndIndexSpecificShardLimits() {
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// Set the cluster-wide shard limit to 6
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updateClusterSetting(CLUSTER_TOTAL_SHARDS_PER_NODE_SETTING.getKey(), 6);
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// Create the first index with 3 shards, 1 replica, and index-specific limit of 1
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Settings indexSettingsWithLimit = Settings.builder()
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.put(SETTING_NUMBER_OF_SHARDS, 3)
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.put(SETTING_NUMBER_OF_REPLICAS, 1)
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.put(INDEX_TOTAL_SHARDS_PER_NODE_SETTING.getKey(), 1)
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.build();
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createIndex("test1", indexSettingsWithLimit);
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// Create the second index with 4 shards and 1 replica
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createIndex("test2", Settings.builder().put(SETTING_NUMBER_OF_SHARDS, 4).put(SETTING_NUMBER_OF_REPLICAS, 1).build());
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// Create the third index with 3 shards and 1 replica
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createIndex("test3", Settings.builder().put(SETTING_NUMBER_OF_SHARDS, 3).put(SETTING_NUMBER_OF_REPLICAS, 1).build());
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try {
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assertBusy(() -> {
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ClusterState state = client().admin().cluster().prepareState().get().getState();
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// Check total number of shards
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assertEquals("Total shards should be 20", 20, state.getRoutingTable().allShards().size());
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int totalAssignedShards = 0;
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int totalUnassignedShards = 0;
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Map<String, Integer> unassignedShardsByIndex = new HashMap<>();
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Map<String, Integer> nodeShardCounts = new HashMap<>();
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Map<String, Set<String>> indexShardsPerNode = new HashMap<>();
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for (RoutingNode routingNode : state.getRoutingNodes()) {
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String nodeName = routingNode.node().getName();
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nodeShardCounts.put(nodeName, routingNode.numberOfOwningShards());
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indexShardsPerNode.put(nodeName, new HashSet<>());
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for (ShardRouting shardRouting : routingNode) {
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indexShardsPerNode.get(nodeName).add(shardRouting.getIndexName());
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}
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}
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for (IndexRoutingTable indexRoutingTable : state.getRoutingTable()) {
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String index = indexRoutingTable.getIndex().getName();
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int indexUnassignedShards = 0;
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for (IndexShardRoutingTable shardRoutingTable : indexRoutingTable) {
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for (ShardRouting shardRouting : shardRoutingTable) {
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if (shardRouting.unassigned()) {
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totalUnassignedShards++;
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indexUnassignedShards++;
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} else {
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totalAssignedShards++;
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}
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}
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}
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unassignedShardsByIndex.put(index, indexUnassignedShards);
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}
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assertEquals("Total assigned shards should be 17", 17, totalAssignedShards);
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assertEquals("Total unassigned shards should be 3", 3, totalUnassignedShards);
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assertEquals("test1 should have 3 unassigned shards", 3, unassignedShardsByIndex.get("test1").intValue());
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assertEquals("test2 should have 0 unassigned shards", 0, unassignedShardsByIndex.getOrDefault("test2", 0).intValue());
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assertEquals("test3 should have 0 unassigned shards", 0, unassignedShardsByIndex.getOrDefault("test3", 0).intValue());
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// Check shard distribution across nodes
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List<Integer> shardCounts = new ArrayList<>(nodeShardCounts.values());
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Collections.sort(shardCounts, Collections.reverseOrder());
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assertEquals("Two nodes should have 6 shards", 6, shardCounts.get(0).intValue());
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assertEquals("Two nodes should have 6 shards", 6, shardCounts.get(1).intValue());
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assertEquals("One node should have 5 shards", 5, shardCounts.get(2).intValue());
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// Check that all nodes have only one shard of the first index
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for (Set<String> indexesOnNode : indexShardsPerNode.values()) {
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assertTrue("Each node should have a shard from test1", indexesOnNode.contains("test1"));
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}
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});
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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/**
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* Integration test to verify the behavior of INDEX_TOTAL_PRIMARY_SHARDS_PER_NODE_SETTING
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* in a non-remote store environment.
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*
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* Scenario:
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* An end-user attempts to create an index with INDEX_TOTAL_PRIMARY_SHARDS_PER_NODE_SETTING
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* on a cluster where remote store is not enabled.
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*
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* Expected Outcome:
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* The system should reject the index creation request and throw an appropriate exception,
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* indicating that this setting is only applicable for remote store enabled clusters.
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*/
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public void testIndexTotalPrimaryShardsPerNodeSettingWithoutRemoteStore() {
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// Attempt to create an index with INDEX_TOTAL_PRIMARY_SHARDS_PER_NODE_SETTING
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Settings indexSettings = Settings.builder()
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.put(SETTING_NUMBER_OF_SHARDS, 3)
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.put(SETTING_NUMBER_OF_REPLICAS, 1)
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.put(INDEX_TOTAL_PRIMARY_SHARDS_PER_NODE_SETTING.getKey(), 1)
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.build();
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// Assert that creating the index throws an exception
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IllegalArgumentException exception = expectThrows(
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IllegalArgumentException.class,
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() -> { createIndex("test_index", indexSettings); }
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);
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// Verify the exception message
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assertTrue(
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"Exception should mention that the setting requires remote store",
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exception.getMessage()
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.contains(
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"Setting [index.routing.allocation.total_primary_shards_per_node] can only be used with remote store enabled clusters"
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)
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);
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}
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/**
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* Integration test to verify the behavior of CLUSTER_TOTAL_PRIMARY_SHARDS_PER_NODE_SETTING
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* in a non-remote store environment.
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*
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* Scenario:
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* An end-user attempts to create an index with CLUSTER_TOTAL_PRIMARY_SHARDS_PER_NODE_SETTING
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* on a cluster where remote store is not enabled.
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*
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* Expected Outcome:
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* The system should reject the index creation request and throw an appropriate exception,
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* indicating that this setting is only applicable for remote store enabled clusters.
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*/
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public void testClusterTotalPrimaryShardsPerNodeSettingWithoutRemoteStore() {
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IllegalArgumentException exception = expectThrows(IllegalArgumentException.class, () -> {
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updateClusterSetting(CLUSTER_TOTAL_PRIMARY_SHARDS_PER_NODE_SETTING.getKey(), 1);
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});
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// Verify the exception message
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assertTrue(
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"Exception should mention that the setting requires remote store",
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exception.getMessage()
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.contains(
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"Setting [cluster.routing.allocation.total_primary_shards_per_node] can only be used with remote store enabled clusters"
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)
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);
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// Attempt to create an index with INDEX_TOTAL_PRIMARY_SHARDS_PER_NODE_SETTING
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Settings indexSettings = Settings.builder()
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.put(SETTING_NUMBER_OF_SHARDS, 3)
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.put(SETTING_NUMBER_OF_REPLICAS, 1)
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.put(INDEX_TOTAL_SHARDS_PER_NODE_SETTING.getKey(), 1)
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.build();
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createIndex("test_index", indexSettings);
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}
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private void updateClusterSetting(String setting, int value) {
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client().admin().cluster().prepareUpdateSettings().setTransientSettings(Settings.builder().put(setting, value)).get();
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}
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}

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