Introduce RemoteIndexClient

Add RemoteIndexClient initial implementation, its accompanying dependencies, and Build Request, Retry Strategy, and test files

build.gradle

@@ -321,7 +321,11 @@ dependencies {
     api "net.java.dev.jna:jna-platform:5.13.0"
     // OpenSearch core is using slf4j 1.7.36. Therefore, we cannot change the version here.
     implementation 'org.slf4j:slf4j-api:1.7.36'
-
+    api 'org.apache.httpcomponents.client5:httpclient5:5.4.1'
+    api 'org.apache.httpcomponents.core5:httpcore5:5.3.2'
+    api 'org.apache.httpcomponents.core5:httpcore5-h2:5.3.2'
+    api "com.fasterxml.jackson.core:jackson-databind:${versions.jackson_databind}"
+    api "com.fasterxml.jackson.core:jackson-annotations:${versions.jackson}"
     zipArchive group: 'org.opensearch.plugin', name:'opensearch-security', version: "${opensearch_build}"
 }
 

src/main/java/org/opensearch/knn/index/KNNSettings.java

@@ -15,10 +15,12 @@
 import org.opensearch.cluster.metadata.IndexMetadata;
 import org.opensearch.cluster.service.ClusterService;
 import org.opensearch.common.Booleans;
+import org.opensearch.common.settings.SecureSetting;
 import org.opensearch.common.settings.Setting;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.unit.TimeValue;
 import org.opensearch.core.action.ActionListener;
+import org.opensearch.core.common.settings.SecureString;
 import org.opensearch.core.common.unit.ByteSizeUnit;
 import org.opensearch.core.common.unit.ByteSizeValue;
 import org.opensearch.index.IndexModule;
@@ -31,6 +33,7 @@
 
 import java.security.InvalidParameterException;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -96,6 +99,11 @@ public class KNNSettings {
     public static final String KNN_DERIVED_SOURCE_ENABLED = "index.knn.derived_source.enabled";
     public static final String KNN_INDEX_REMOTE_VECTOR_BUILD = "index.knn.remote_index_build.enabled";
     public static final String KNN_REMOTE_VECTOR_REPO = "knn.remote_index_build.vector_repo";
+    public static final String KNN_REMOTE_BUILD_SERVICE_ENDPOINT = "knn.remote_build_service.endpoint";
+    public static final String KNN_REMOTE_BUILD_SERVICE_POLL_INTERVAL = "knn.remote_build_service.poll_interval";
+    public static final String KNN_REMOTE_BUILD_SERVICE_TIMEOUT = "knn.remote_build_service.timeout";
+    public static final String KNN_REMOTE_BUILD_SERVICE_USERNAME = "knn.remote_build_service.username";
+    public static final String KNN_REMOTE_BUILD_SERVICE_PASSWORD = "knn.remote_build_service.password";
 
     /**
      * Default setting values
@@ -127,6 +135,9 @@ public class KNNSettings {
     public static final Integer KNN_DEFAULT_QUANTIZATION_STATE_CACHE_EXPIRY_TIME_MINUTES = 60;
     public static final boolean KNN_DISK_VECTOR_SHARD_LEVEL_RESCORING_DISABLED_VALUE = false;
 
+    public static final Integer KNN_DEFAULT_REMOTE_BUILD_SERVICE_TIMEOUT_MINUTES = 60;
+    public static final Integer KNN_DEFAULT_REMOTE_BUILD_SERVICE_POLL_INTERVAL_SECONDS = 30;
+
     /**
      * Settings Definition
      */
@@ -388,6 +399,49 @@ public class KNNSettings {
      */
     public static final Setting<String> KNN_REMOTE_VECTOR_REPO_SETTING = Setting.simpleString(KNN_REMOTE_VECTOR_REPO, Dynamic, NodeScope);
 
+    /**
+     * List of remote build service endpoints to be used by remote build service. If greater than one, the client uses round-robin task assignment when workers are busy.
+     */
+    public static final Setting<List<String>> KNN_REMOTE_BUILD_SERVICE_ENDPOINT_SETTING = Setting.listSetting(
+        KNN_REMOTE_BUILD_SERVICE_ENDPOINT,
+        Collections.emptyList(),
+        Function.identity(),
+        NodeScope,
+        Dynamic
+    );
+
+    /**
+     * Time the remote build service client will wait before falling back to CPU index build
+     */
+    public static final Setting<TimeValue> KNN_REMOTE_BUILD_SERVICE_TIMEOUT_SETTING = Setting.timeSetting(
+        KNN_REMOTE_BUILD_SERVICE_TIMEOUT,
+        TimeValue.timeValueMinutes(KNN_DEFAULT_REMOTE_BUILD_SERVICE_TIMEOUT_MINUTES),
+        NodeScope,
+        Dynamic
+    );
+
+    /**
+     * Setting to control how often the remote build service client polls the build service for the status of the job
+     */
+    public static final Setting<TimeValue> KNN_REMOTE_BUILD_SERVICE_POLL_INTERVAL_SETTING = Setting.timeSetting(
+        KNN_REMOTE_BUILD_SERVICE_POLL_INTERVAL,
+        TimeValue.timeValueSeconds(KNN_DEFAULT_REMOTE_BUILD_SERVICE_POLL_INTERVAL_SECONDS),
+        NodeScope,
+        Dynamic
+    );
+
+    /**
+     * Keystore settings for build service HTTP authorization
+     */
+    public static final Setting<SecureString> KNN_REMOTE_BUILD_SERVICE_USERNAME_SETTING = SecureSetting.secureString(
+        KNN_REMOTE_BUILD_SERVICE_USERNAME,
+        null
+    );
+    public static final Setting<SecureString> KNN_REMOTE_BUILD_SERVICE_PASSWORD_SETTING = SecureSetting.secureString(
+        KNN_REMOTE_BUILD_SERVICE_PASSWORD,
+        null
+    );
+
     /**
      * Dynamic settings
      */
@@ -550,6 +604,26 @@ private Setting<?> getSetting(String key) {
             return KNN_REMOTE_VECTOR_REPO_SETTING;
         }
 
+        if (KNN_REMOTE_BUILD_SERVICE_ENDPOINT.equals(key)) {
+            return KNN_REMOTE_BUILD_SERVICE_ENDPOINT_SETTING;
+        }
+
+        if (KNN_REMOTE_BUILD_SERVICE_TIMEOUT.equals(key)) {
+            return KNN_REMOTE_BUILD_SERVICE_TIMEOUT_SETTING;
+        }
+
+        if (KNN_REMOTE_BUILD_SERVICE_POLL_INTERVAL.equals(key)) {
+            return KNN_REMOTE_BUILD_SERVICE_POLL_INTERVAL_SETTING;
+        }
+
+        if (KNN_REMOTE_BUILD_SERVICE_USERNAME.equals(key)) {
+            return KNN_REMOTE_BUILD_SERVICE_USERNAME_SETTING;
+        }
+
+        if (KNN_REMOTE_BUILD_SERVICE_PASSWORD.equals(key)) {
+            return KNN_REMOTE_BUILD_SERVICE_PASSWORD_SETTING;
+        }
+
         throw new IllegalArgumentException("Cannot find setting by key [" + key + "]");
     }
 
@@ -577,7 +651,12 @@ public List<Setting<?>> getSettings() {
             KNN_DISK_VECTOR_SHARD_LEVEL_RESCORING_DISABLED_SETTING,
             KNN_DERIVED_SOURCE_ENABLED_SETTING,
             KNN_INDEX_REMOTE_VECTOR_BUILD_SETTING,
-            KNN_REMOTE_VECTOR_REPO_SETTING
+            KNN_REMOTE_VECTOR_REPO_SETTING,
+            KNN_REMOTE_BUILD_SERVICE_ENDPOINT_SETTING,
+            KNN_REMOTE_BUILD_SERVICE_TIMEOUT_SETTING,
+            KNN_REMOTE_BUILD_SERVICE_POLL_INTERVAL_SETTING,
+            KNN_REMOTE_BUILD_SERVICE_USERNAME_SETTING,
+            KNN_REMOTE_BUILD_SERVICE_PASSWORD_SETTING
         );
         return Stream.concat(settings.stream(), Stream.concat(getFeatureFlags().stream(), dynamicCacheSettings.values().stream()))
             .collect(Collectors.toList());

src/main/java/org/opensearch/knn/index/codec/nativeindex/remote/RemoteIndexBuildStrategy.java

@@ -15,6 +15,7 @@
 import org.opensearch.knn.index.KNNSettings;
 import org.opensearch.knn.index.codec.nativeindex.NativeIndexBuildStrategy;
 import org.opensearch.knn.index.codec.nativeindex.model.BuildIndexParams;
+import org.opensearch.knn.index.remote.RemoteIndexClient;
 import org.opensearch.knn.index.vectorvalues.KNNVectorValues;
 import org.opensearch.repositories.RepositoriesService;
 import org.opensearch.repositories.Repository;
@@ -88,12 +89,12 @@ public void buildAndWriteIndex(BuildIndexParams indexInfo) throws IOException {
             log.debug("Repository write took {} ms for vector field [{}]", time_in_millis, indexInfo.getFieldName());
 
             stopWatch = new StopWatch().start();
-            submitVectorBuild();
+            String jobId = RemoteIndexClient.getInstance().submitVectorBuild();
             time_in_millis = stopWatch.stop().totalTime().millis();
             log.debug("Submit vector build took {} ms for vector field [{}]", time_in_millis, indexInfo.getFieldName());
 
             stopWatch = new StopWatch().start();
-            awaitVectorBuild();
+            String indexPath = RemoteIndexClient.getInstance().awaitVectorBuild(jobId);
             time_in_millis = stopWatch.stop().totalTime().millis();
             log.debug("Await vector build took {} ms for vector field [{}]", time_in_millis, indexInfo.getFieldName());
 

src/main/java/org/opensearch/knn/index/remote/RemoteBuildRequest.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package org.opensearch.knn.index.remote;
+
+import org.opensearch.common.xcontent.json.JsonXContent;
+import lombok.Builder;
+import lombok.Getter;
+import org.opensearch.core.xcontent.XContentBuilder;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
+@Builder
+@Getter
+public class RemoteBuildRequest {
+    private final String repositoryType;
+    private final String containerName;
+    private final String objectPath;
+    private final String tenantId;
+    private final int dimension;
+    private final int docCount;
+    private final String dataType;
+    private final String engine;
+    private final String algorithm;
+    @Builder.Default
+    private final Map<String, Object> indexParameters = new HashMap<>();
+
+    // TODO: Add type checking to all parameters, add individual methods (e.g. setEfConstruction) to check index params
+
+    public String toJson() throws IOException {
+        try (XContentBuilder builder = JsonXContent.contentBuilder()) {
+            builder.startObject();
+            builder.field("repository_type", repositoryType);
+            builder.field("container_name", containerName);
+            builder.field("object_path", objectPath);
+            builder.field("tenant_id", tenantId);
+            builder.field("dimension", dimension);
+            builder.field("doc_count", docCount);
+            builder.field("data_type", dataType);
+            builder.field("engine", engine);
+            builder.field("index_parameters", indexParameters);
+            builder.endObject();
+            return builder.toString();
+        }
+    }
+
+}