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[Backport 2.16] Route search traffic to _primary_first for warm index #15048

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[Backport 2.16] Route search traffic to _primary_first for warm index #15048

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9 changes: 9 additions & 0 deletions server/src/main/java/org/opensearch/cluster/routing/OperationRouting.java
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Original file line number Diff line number Diff line change
Expand Up @@ -42,8 +42,10 @@
import org.opensearch.common.settings.ClusterSettings;
import org.opensearch.common.settings.Setting;
import org.opensearch.common.settings.Settings;
import org.opensearch.common.util.FeatureFlags;
import org.opensearch.core.common.Strings;
import org.opensearch.core.index.shard.ShardId;
import org.opensearch.index.IndexModule;
import org.opensearch.index.IndexNotFoundException;
import org.opensearch.node.ResponseCollectorService;

Expand Down Expand Up @@ -245,6 +247,13 @@ public GroupShardsIterator<ShardIterator> searchShards(
preference = Preference.PRIMARY.type();
}

if (FeatureFlags.isEnabled(FeatureFlags.TIERED_REMOTE_INDEX)
&& IndexModule.DataLocalityType.PARTIAL.name()
.equals(indexMetadataForShard.getSettings().get(IndexModule.INDEX_STORE_LOCALITY_SETTING.getKey()))
&& (preference == null || preference.isEmpty())) {
preference = Preference.PRIMARY_FIRST.type();
}

ShardIterator iterator = preferenceActiveShardIterator(
shard,
clusterState.nodes().getLocalNodeId(),
Expand Down
64 changes: 64 additions & 0 deletions server/src/test/java/org/opensearch/cluster/routing/OperationRoutingTests.java
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Expand Up @@ -41,9 +41,11 @@
import org.opensearch.cluster.node.DiscoveryNodeRole;
import org.opensearch.cluster.routing.allocation.decider.AwarenessAllocationDecider;
import org.opensearch.cluster.service.ClusterService;
import org.opensearch.common.SuppressForbidden;
import org.opensearch.common.settings.ClusterSettings;
import org.opensearch.common.settings.Settings;
import org.opensearch.common.unit.TimeValue;
import org.opensearch.common.util.FeatureFlags;
import org.opensearch.common.util.io.IOUtils;
import org.opensearch.core.index.Index;
import org.opensearch.core.index.shard.ShardId;
Expand Down Expand Up @@ -1054,6 +1056,68 @@ public void testSearchableSnapshotPrimaryDefault() throws Exception {
}
}

@SuppressForbidden(reason = "feature flag overrides")
public void testPartialIndexPrimaryDefault() throws Exception {
System.setProperty(FeatureFlags.TIERED_REMOTE_INDEX, "true");
final int numIndices = 1;
final int numShards = 2;
final int numReplicas = 2;
final String[] indexNames = new String[numIndices];
for (int i = 0; i < numIndices; i++) {
indexNames[i] = "test" + i;
}
// The first index is a partial index
final String indexName = indexNames[0];
ClusterService clusterService = null;
ThreadPool threadPool = null;

try {
OperationRouting opRouting = new OperationRouting(
Settings.EMPTY,
new ClusterSettings(Settings.EMPTY, ClusterSettings.BUILT_IN_CLUSTER_SETTINGS)
);

ClusterState state = ClusterStateCreationUtils.stateWithAssignedPrimariesAndReplicas(indexNames, numShards, numReplicas);
threadPool = new TestThreadPool("testPartialIndexPrimaryDefault");
clusterService = ClusterServiceUtils.createClusterService(threadPool);

// Update the index config within the cluster state to modify the index to a partial index
IndexMetadata partialIndexMetadata = IndexMetadata.builder(indexName)
.settings(
Settings.builder()
.put(state.metadata().index(indexName).getSettings())
.put(IndexModule.INDEX_STORE_LOCALITY_SETTING.getKey(), IndexModule.DataLocalityType.PARTIAL)
.build()
)
.build();
Metadata.Builder metadataBuilder = Metadata.builder(state.metadata())
.put(partialIndexMetadata, false)
.generateClusterUuidIfNeeded();
state = ClusterState.builder(state).metadata(metadataBuilder.build()).build();

// Verify default preference is primary only
GroupShardsIterator<ShardIterator> groupIterator = opRouting.searchShards(state, indexNames, null, null);
assertThat("One group per index shard", groupIterator.size(), equalTo(numIndices * numShards));

for (ShardIterator shardIterator : groupIterator) {
assertTrue("Only primary should exist with no preference", shardIterator.nextOrNull().primary());
}

// Verify alternative preference can be applied to a partial index
groupIterator = opRouting.searchShards(state, indexNames, null, "_replica");
assertThat("One group per index shard", groupIterator.size(), equalTo(numIndices * numShards));

for (ShardIterator shardIterator : groupIterator) {
assertThat("Replica shards will be returned", shardIterator.size(), equalTo(numReplicas));
assertFalse("Returned shard should be a replica", shardIterator.nextOrNull().primary());
}
} finally {
IOUtils.close(clusterService);
terminate(threadPool);
System.setProperty(FeatureFlags.TIERED_REMOTE_INDEX, "false");
}
}

private DiscoveryNode[] setupNodes() {
// Sets up two data nodes in zone-a and one data node in zone-b
List<String> zones = Arrays.asList("a", "a", "b");
Expand Down
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