URI path filtering support in cluster stats API (#15938)

* URI path filtering support in cluster stats API

Signed-off-by: Swetha Guptha <gupthasg@amazon.com>
(cherry picked from commit 1982427)
Signed-off-by: Swetha Guptha <gupthasg@amazon.com>

CHANGELOG.md

@@ -27,6 +27,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Add method to return dynamic SecureTransportParameters from SecureTransportSettingsProvider interface ([#16387](https://github.com/opensearch-project/OpenSearch/pull/16387)
 - Add _list/shards API as paginated alternate to _cat/shards ([#14641](https://github.com/opensearch-project/OpenSearch/pull/14641))
 - [Star Tree - Search] Add support for metric aggregations with/without term query ([15289](https://github.com/opensearch-project/OpenSearch/pull/15289))
+- URI path filtering support in cluster stats API ([#15938](https://github.com/opensearch-project/OpenSearch/pull/15938))
+
 
 ### Dependencies
 - Bump `org.apache.logging.log4j:log4j-core` from 2.23.1 to 2.24.0 ([#15858](https://github.com/opensearch-project/OpenSearch/pull/15858))

qa/rolling-upgrade/src/test/java/org/opensearch/upgrades/ClusterStatsIT.java

@@ -0,0 +1,67 @@
+/*
+ * 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.upgrades;
+
+import org.opensearch.Version;
+import org.opensearch.client.Request;
+import org.opensearch.client.Response;
+
+import java.io.IOException;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+public class ClusterStatsIT extends AbstractRollingTestCase {
+
+    private final List<String> nodeStatsMetrics = List.of("os", "process", "jvm", "fs", "plugins", "ingest", "network_types", "discovery_types", "packaging_types");
+
+    private final List<String> indicesStatsMetrics = List.of("shards", "docs", "store", "fielddata", "query_cache", "completion", "segments", "analysis", "mappings");
+
+    public void testClusterStats() throws IOException {
+        Response response = client().performRequest(new Request("GET", "/_cluster/stats"));
+        validateClusterStatsWithFilterResponse(response, nodeStatsMetrics, indicesStatsMetrics);
+        if (AbstractRollingTestCase.UPGRADE_FROM_VERSION.onOrAfter(Version.V_2_18_0) || (
+            CLUSTER_TYPE == ClusterType.UPGRADED && Version.CURRENT.onOrAfter(Version.V_2_18_0))) {
+            response = client().performRequest(new Request("GET", "/_cluster/stats/os/nodes/_all"));
+            validateClusterStatsWithFilterResponse(response, List.of("os"), Collections.emptyList());
+            response = client().performRequest(new Request("GET", "/_cluster/stats/indices/mappings/nodes/_all"));
+            validateClusterStatsWithFilterResponse(response, Collections.emptyList(), List.of("mappings"));
+            response = client().performRequest(new Request("GET", "/_cluster/stats/os,indices/mappings/nodes/_all"));
+            validateClusterStatsWithFilterResponse(response, List.of("os"), List.of("mappings"));
+        }
+    }
+
+    private void validateClusterStatsWithFilterResponse(Response response, List<String> requestedNodesStatsMetrics, List<String> requestedIndicesStatsMetrics) throws IOException {
+        assertEquals(200, response.getStatusLine().getStatusCode());
+        Map<String, Object> entity = entityAsMap(response);
+        if (requestedNodesStatsMetrics != null && !requestedNodesStatsMetrics.isEmpty()) {
+            assertTrue(entity.containsKey("nodes"));
+            Map<?, ?> nodesStats = (Map<?, ?>) entity.get("nodes");
+            for (String metric : nodeStatsMetrics) {
+                if (requestedNodesStatsMetrics.contains(metric)) {
+                    assertTrue(nodesStats.containsKey(metric));
+                } else {
+                    assertFalse(nodesStats.containsKey(metric));
+                }
+            }
+        }
+
+        if (requestedIndicesStatsMetrics != null && !requestedIndicesStatsMetrics.isEmpty()) {
+            assertTrue(entity.containsKey("indices"));
+            Map<?, ?> indicesStats = (Map<?, ?>) entity.get("indices");
+            for (String metric : indicesStatsMetrics) {
+                if (requestedIndicesStatsMetrics.contains(metric)) {
+                    assertTrue(indicesStats.containsKey(metric));
+                } else {
+                    assertFalse(indicesStats.containsKey(metric));
+                }
+            }
+        }
+    }
+}

server/src/main/java/org/opensearch/action/admin/cluster/stats/ClusterStatsIndices.java

@@ -32,6 +32,7 @@
 
 package org.opensearch.action.admin.cluster.stats;
 
+import org.opensearch.action.admin.cluster.stats.ClusterStatsRequest.IndexMetric;
 import org.opensearch.action.admin.indices.stats.CommonStats;
 import org.opensearch.common.annotation.PublicApi;
 import org.opensearch.core.xcontent.ToXContentFragment;
@@ -47,6 +48,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 
 /**
  * Cluster Stats per index
@@ -68,14 +70,23 @@ public class ClusterStatsIndices implements ToXContentFragment {
     private MappingStats mappings;
 
     public ClusterStatsIndices(List<ClusterStatsNodeResponse> nodeResponses, MappingStats mappingStats, AnalysisStats analysisStats) {
-        Map<String, ShardStats> countsPerIndex = new HashMap<>();
+        this(Set.of(IndexMetric.values()), nodeResponses, mappingStats, analysisStats);
+
+    }
 
-        this.docs = new DocsStats();
-        this.store = new StoreStats();
-        this.fieldData = new FieldDataStats();
-        this.queryCache = new QueryCacheStats();
-        this.completion = new CompletionStats();
-        this.segments = new SegmentsStats();
+    public ClusterStatsIndices(
+        Set<IndexMetric> indicesMetrics,
+        List<ClusterStatsNodeResponse> nodeResponses,
+        MappingStats mappingStats,
+        AnalysisStats analysisStats
+    ) {
+        Map<String, ShardStats> countsPerIndex = new HashMap<>();
+        this.docs = indicesMetrics.contains(IndexMetric.DOCS) ? new DocsStats() : null;
+        this.store = indicesMetrics.contains(IndexMetric.STORE) ? new StoreStats() : null;
+        this.fieldData = indicesMetrics.contains(IndexMetric.FIELDDATA) ? new FieldDataStats() : null;
+        this.queryCache = indicesMetrics.contains(IndexMetric.QUERY_CACHE) ? new QueryCacheStats() : null;
+        this.completion = indicesMetrics.contains(IndexMetric.COMPLETION) ? new CompletionStats() : null;
+        this.segments = indicesMetrics.contains(IndexMetric.SEGMENTS) ? new SegmentsStats() : null;
 
         for (ClusterStatsNodeResponse r : nodeResponses) {
             // Aggregated response from the node
@@ -92,12 +103,24 @@ public ClusterStatsIndices(List<ClusterStatsNodeResponse> nodeResponses, Mapping
                     }
                 }
 
-                docs.add(r.getAggregatedNodeLevelStats().commonStats.docs);
-                store.add(r.getAggregatedNodeLevelStats().commonStats.store);
-                fieldData.add(r.getAggregatedNodeLevelStats().commonStats.fieldData);
-                queryCache.add(r.getAggregatedNodeLevelStats().commonStats.queryCache);
-                completion.add(r.getAggregatedNodeLevelStats().commonStats.completion);
-                segments.add(r.getAggregatedNodeLevelStats().commonStats.segments);
+                if (indicesMetrics.contains(IndexMetric.DOCS)) {
+                    docs.add(r.getAggregatedNodeLevelStats().commonStats.docs);
+                }
+                if (indicesMetrics.contains(IndexMetric.STORE)) {
+                    store.add(r.getAggregatedNodeLevelStats().commonStats.store);
+                }
+                if (indicesMetrics.contains(IndexMetric.FIELDDATA)) {
+                    fieldData.add(r.getAggregatedNodeLevelStats().commonStats.fieldData);
+                }
+                if (indicesMetrics.contains(IndexMetric.QUERY_CACHE)) {
+                    queryCache.add(r.getAggregatedNodeLevelStats().commonStats.queryCache);
+                }
+                if (indicesMetrics.contains(IndexMetric.COMPLETION)) {
+                    completion.add(r.getAggregatedNodeLevelStats().commonStats.completion);
+                }
+                if (indicesMetrics.contains(IndexMetric.SEGMENTS)) {
+                    segments.add(r.getAggregatedNodeLevelStats().commonStats.segments);
+                }
             } else {
                 // Default response from the node
                 for (org.opensearch.action.admin.indices.stats.ShardStats shardStats : r.shardsStats()) {
@@ -113,21 +136,35 @@ public ClusterStatsIndices(List<ClusterStatsNodeResponse> nodeResponses, Mapping
 
                     if (shardStats.getShardRouting().primary()) {
                         indexShardStats.primaries++;
-                        docs.add(shardCommonStats.docs);
+                        if (indicesMetrics.contains(IndexMetric.DOCS)) {
+                            docs.add(shardCommonStats.docs);
+                        }
+                    }
+                    if (indicesMetrics.contains(IndexMetric.STORE)) {
+                        store.add(shardCommonStats.store);
+                    }
+                    if (indicesMetrics.contains(IndexMetric.FIELDDATA)) {
+                        fieldData.add(shardCommonStats.fieldData);
+                    }
+                    if (indicesMetrics.contains(IndexMetric.QUERY_CACHE)) {
+                        queryCache.add(shardCommonStats.queryCache);
+                    }
+                    if (indicesMetrics.contains(IndexMetric.COMPLETION)) {
+                        completion.add(shardCommonStats.completion);
+                    }
+                    if (indicesMetrics.contains(IndexMetric.SEGMENTS)) {
+                        segments.add(shardCommonStats.segments);
                     }
-                    store.add(shardCommonStats.store);
-                    fieldData.add(shardCommonStats.fieldData);
-                    queryCache.add(shardCommonStats.queryCache);
-                    completion.add(shardCommonStats.completion);
-                    segments.add(shardCommonStats.segments);
                 }
             }
         }
 
-        shards = new ShardStats();
         indexCount = countsPerIndex.size();
-        for (final ShardStats indexCountsCursor : countsPerIndex.values()) {
-            shards.addIndexShardCount(indexCountsCursor);
+        if (indicesMetrics.contains(IndexMetric.SHARDS)) {
+            shards = new ShardStats();
+            for (final ShardStats indexCountsCursor : countsPerIndex.values()) {
+                shards.addIndexShardCount(indexCountsCursor);
+            }
         }
 
         this.mappings = mappingStats;
@@ -186,13 +223,27 @@ static final class Fields {
     @Override
     public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
         builder.field(Fields.COUNT, indexCount);
-        shards.toXContent(builder, params);
-        docs.toXContent(builder, params);
-        store.toXContent(builder, params);
-        fieldData.toXContent(builder, params);
-        queryCache.toXContent(builder, params);
-        completion.toXContent(builder, params);
-        segments.toXContent(builder, params);
+        if (shards != null) {
+            shards.toXContent(builder, params);
+        }
+        if (docs != null) {
+            docs.toXContent(builder, params);
+        }
+        if (store != null) {
+            store.toXContent(builder, params);
+        }
+        if (fieldData != null) {
+            fieldData.toXContent(builder, params);
+        }
+        if (queryCache != null) {
+            queryCache.toXContent(builder, params);
+        }
+        if (completion != null) {
+            completion.toXContent(builder, params);
+        }
+        if (segments != null) {
+            segments.toXContent(builder, params);
+        }
         if (mappings != null) {
             mappings.toXContent(builder, params);
         }

server/src/main/java/org/opensearch/action/admin/cluster/stats/ClusterStatsNodes.java

@@ -36,6 +36,7 @@
 import org.opensearch.action.admin.cluster.node.info.NodeInfo;
 import org.opensearch.action.admin.cluster.node.info.PluginsAndModules;
 import org.opensearch.action.admin.cluster.node.stats.NodeStats;
+import org.opensearch.action.admin.cluster.stats.ClusterStatsRequest.Metric;
 import org.opensearch.cluster.node.DiscoveryNode;
 import org.opensearch.cluster.node.DiscoveryNodeRole;
 import org.opensearch.common.annotation.PublicApi;
@@ -89,10 +90,29 @@ public class ClusterStatsNodes implements ToXContentFragment {
     private final PackagingTypes packagingTypes;
     private final IngestStats ingestStats;
 
+    public static final Set<Metric> NODE_STATS_METRICS = Set.of(
+        // Stats computed from node info and node stat
+        Metric.OS,
+        Metric.JVM,
+        // Stats computed from node stat
+        Metric.FS,
+        Metric.PROCESS,
+        Metric.INGEST,
+        // Stats computed from node info
+        Metric.PLUGINS,
+        Metric.NETWORK_TYPES,
+        Metric.DISCOVERY_TYPES,
+        Metric.PACKAGING_TYPES
+    );
+
     ClusterStatsNodes(List<ClusterStatsNodeResponse> nodeResponses) {
+        this(Set.of(Metric.values()), nodeResponses);
+    }
+
+    ClusterStatsNodes(Set<Metric> requestedMetrics, List<ClusterStatsNodeResponse> nodeResponses) {
         this.versions = new HashSet<>();
-        this.fs = new FsInfo.Path();
-        this.plugins = new HashSet<>();
+        this.fs = requestedMetrics.contains(ClusterStatsRequest.Metric.FS) ? new FsInfo.Path() : null;
+        this.plugins = requestedMetrics.contains(ClusterStatsRequest.Metric.PLUGINS) ? new HashSet<>() : null;
 
         Set<InetAddress> seenAddresses = new HashSet<>(nodeResponses.size());
         List<NodeInfo> nodeInfos = new ArrayList<>(nodeResponses.size());
@@ -101,26 +121,29 @@ public class ClusterStatsNodes implements ToXContentFragment {
             nodeInfos.add(nodeResponse.nodeInfo());
             nodeStats.add(nodeResponse.nodeStats());
             this.versions.add(nodeResponse.nodeInfo().getVersion());
-            this.plugins.addAll(nodeResponse.nodeInfo().getInfo(PluginsAndModules.class).getPluginInfos());
+            if (requestedMetrics.contains(ClusterStatsRequest.Metric.PLUGINS)) {
+                this.plugins.addAll(nodeResponse.nodeInfo().getInfo(PluginsAndModules.class).getPluginInfos());
+            }
 
             // now do the stats that should be deduped by hardware (implemented by ip deduping)
             TransportAddress publishAddress = nodeResponse.nodeInfo().getInfo(TransportInfo.class).address().publishAddress();
             final InetAddress inetAddress = publishAddress.address().getAddress();
             if (!seenAddresses.add(inetAddress)) {
                 continue;
             }
-            if (nodeResponse.nodeStats().getFs() != null) {
+            if (requestedMetrics.contains(ClusterStatsRequest.Metric.FS) && nodeResponse.nodeStats().getFs() != null) {
                 this.fs.add(nodeResponse.nodeStats().getFs().getTotal());
             }
         }
+
         this.counts = new Counts(nodeInfos);
-        this.os = new OsStats(nodeInfos, nodeStats);
-        this.process = new ProcessStats(nodeStats);
-        this.jvm = new JvmStats(nodeInfos, nodeStats);
-        this.networkTypes = new NetworkTypes(nodeInfos);
-        this.discoveryTypes = new DiscoveryTypes(nodeInfos);
-        this.packagingTypes = new PackagingTypes(nodeInfos);
-        this.ingestStats = new IngestStats(nodeStats);
+        this.networkTypes = requestedMetrics.contains(ClusterStatsRequest.Metric.NETWORK_TYPES) ? new NetworkTypes(nodeInfos) : null;
+        this.discoveryTypes = requestedMetrics.contains(ClusterStatsRequest.Metric.DISCOVERY_TYPES) ? new DiscoveryTypes(nodeInfos) : null;
+        this.packagingTypes = requestedMetrics.contains(ClusterStatsRequest.Metric.PACKAGING_TYPES) ? new PackagingTypes(nodeInfos) : null;
+        this.ingestStats = requestedMetrics.contains(ClusterStatsRequest.Metric.INGEST) ? new IngestStats(nodeStats) : null;
+        this.process = requestedMetrics.contains(ClusterStatsRequest.Metric.PROCESS) ? new ProcessStats(nodeStats) : null;
+        this.os = requestedMetrics.contains(ClusterStatsRequest.Metric.OS) ? new OsStats(nodeInfos, nodeStats) : null;
+        this.jvm = requestedMetrics.contains(ClusterStatsRequest.Metric.JVM) ? new JvmStats(nodeInfos, nodeStats) : null;
     }
 
     public Counts getCounts() {
@@ -179,36 +202,54 @@ public XContentBuilder toXContent(XContentBuilder builder, Params params) throws
         }
         builder.endArray();
 
-        builder.startObject(Fields.OS);
-        os.toXContent(builder, params);
-        builder.endObject();
+        if (os != null) {
+            builder.startObject(Fields.OS);
+            os.toXContent(builder, params);
+            builder.endObject();
+        }
 
-        builder.startObject(Fields.PROCESS);
-        process.toXContent(builder, params);
-        builder.endObject();
+        if (process != null) {
+            builder.startObject(Fields.PROCESS);
+            process.toXContent(builder, params);
+            builder.endObject();
+        }
 
-        builder.startObject(Fields.JVM);
-        jvm.toXContent(builder, params);
-        builder.endObject();
+        if (jvm != null) {
+            builder.startObject(Fields.JVM);
+            jvm.toXContent(builder, params);
+            builder.endObject();
+        }
 
-        builder.field(Fields.FS);
-        fs.toXContent(builder, params);
+        if (fs != null) {
+            builder.field(Fields.FS);
+            fs.toXContent(builder, params);
+        }
 
-        builder.startArray(Fields.PLUGINS);
-        for (PluginInfo pluginInfo : plugins) {
-            pluginInfo.toXContent(builder, params);
+        if (plugins != null) {
+            builder.startArray(Fields.PLUGINS);
+            for (PluginInfo pluginInfo : plugins) {
+                pluginInfo.toXContent(builder, params);
+            }
+            builder.endArray();
         }
-        builder.endArray();
 
-        builder.startObject(Fields.NETWORK_TYPES);
-        networkTypes.toXContent(builder, params);
-        builder.endObject();
+        if (networkTypes != null) {
+            builder.startObject(Fields.NETWORK_TYPES);
+            networkTypes.toXContent(builder, params);
+            builder.endObject();
+        }
 
-        discoveryTypes.toXContent(builder, params);
+        if (discoveryTypes != null) {
+            discoveryTypes.toXContent(builder, params);
+        }
 
-        packagingTypes.toXContent(builder, params);
+        if (packagingTypes != null) {
+            packagingTypes.toXContent(builder, params);
+        }
 
-        ingestStats.toXContent(builder, params);
+        if (ingestStats != null) {
+            ingestStats.toXContent(builder, params);
+        }
 
         return builder;
     }