[Backport 2.x] Query grouping framework for Top N queries and group by query similarity

src/main/java/org/opensearch/plugin/insights/QueryInsightsPlugin.java

@@ -130,6 +130,8 @@ public List<Setting<?>> getSettings() {
             QueryInsightsSettings.TOP_N_MEMORY_QUERIES_SIZE,
             QueryInsightsSettings.TOP_N_MEMORY_QUERIES_WINDOW_SIZE,
             QueryInsightsSettings.TOP_N_MEMORY_EXPORTER_SETTINGS,
+            QueryInsightsSettings.TOP_N_QUERIES_GROUP_BY,
+            QueryInsightsSettings.TOP_N_QUERIES_MAX_GROUPS_EXCLUDING_N,
             QueryCategorizationSettings.SEARCH_QUERY_METRICS_ENABLED_SETTING
         );
     }

src/main/java/org/opensearch/plugin/insights/core/listener/QueryInsightsListener.java

@@ -9,6 +9,8 @@
 package org.opensearch.plugin.insights.core.listener;
 
 import static org.opensearch.plugin.insights.settings.QueryCategorizationSettings.SEARCH_QUERY_METRICS_ENABLED_SETTING;
+import static org.opensearch.plugin.insights.settings.QueryInsightsSettings.TOP_N_QUERIES_GROUP_BY;
+import static org.opensearch.plugin.insights.settings.QueryInsightsSettings.TOP_N_QUERIES_MAX_GROUPS_EXCLUDING_N;
 import static org.opensearch.plugin.insights.settings.QueryInsightsSettings.getTopNEnabledSetting;
 import static org.opensearch.plugin.insights.settings.QueryInsightsSettings.getTopNSizeSetting;
 import static org.opensearch.plugin.insights.settings.QueryInsightsSettings.getTopNWindowSizeSetting;
@@ -31,7 +33,9 @@
 import org.opensearch.core.tasks.resourcetracker.TaskResourceInfo;
 import org.opensearch.core.xcontent.ToXContent;
 import org.opensearch.plugin.insights.core.service.QueryInsightsService;
+import org.opensearch.plugin.insights.core.service.categorizer.QueryShapeGenerator;
 import org.opensearch.plugin.insights.rules.model.Attribute;
+import org.opensearch.plugin.insights.rules.model.Measurement;
 import org.opensearch.plugin.insights.rules.model.MetricType;
 import org.opensearch.plugin.insights.rules.model.SearchQueryRecord;
 import org.opensearch.tasks.Task;
@@ -101,6 +105,26 @@ public QueryInsightsListener(
             this.queryInsightsService.setWindowSize(type, clusterService.getClusterSettings().get(getTopNWindowSizeSetting(type)));
         }
 
+        // Settings endpoints set for grouping top n queries
+        clusterService.getClusterSettings()
+            .addSettingsUpdateConsumer(
+                TOP_N_QUERIES_GROUP_BY,
+                v -> this.queryInsightsService.setGrouping(v),
+                v -> this.queryInsightsService.validateGrouping(v)
+            );
+        this.queryInsightsService.validateGrouping(clusterService.getClusterSettings().get(TOP_N_QUERIES_GROUP_BY));
+        this.queryInsightsService.setGrouping(clusterService.getClusterSettings().get(TOP_N_QUERIES_GROUP_BY));
+
+        clusterService.getClusterSettings()
+            .addSettingsUpdateConsumer(
+                TOP_N_QUERIES_MAX_GROUPS_EXCLUDING_N,
+                v -> this.queryInsightsService.setMaximumGroups(v),
+                v -> this.queryInsightsService.validateMaximumGroups(v)
+            );
+        this.queryInsightsService.validateMaximumGroups(clusterService.getClusterSettings().get(TOP_N_QUERIES_MAX_GROUPS_EXCLUDING_N));
+        this.queryInsightsService.setMaximumGroups(clusterService.getClusterSettings().get(TOP_N_QUERIES_MAX_GROUPS_EXCLUDING_N));
+
+        // Settings endpoints set for search query metrics
         clusterService.getClusterSettings()
             .addSettingsUpdateConsumer(SEARCH_QUERY_METRICS_ENABLED_SETTING, v -> setSearchQueryMetricsEnabled(v));
         setSearchQueryMetricsEnabled(clusterService.getClusterSettings().get(SEARCH_QUERY_METRICS_ENABLED_SETTING));
@@ -191,32 +215,40 @@ private void constructSearchQueryRecord(final SearchPhaseContext context, final
 
         final SearchRequest request = context.getRequest();
         try {
-            Map<MetricType, Number> measurements = new HashMap<>();
+            Map<MetricType, Measurement> measurements = new HashMap<>();
             if (shouldCollect(MetricType.LATENCY)) {
                 measurements.put(
                     MetricType.LATENCY,
-                    TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - searchRequestContext.getAbsoluteStartNanos())
+                    new Measurement(TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - searchRequestContext.getAbsoluteStartNanos()))
                 );
             }
             if (shouldCollect(MetricType.CPU)) {
                 measurements.put(
                     MetricType.CPU,
-                    tasksResourceUsages.stream().map(a -> a.getTaskResourceUsage().getCpuTimeInNanos()).mapToLong(Long::longValue).sum()
+                    new Measurement(
+                        tasksResourceUsages.stream().map(a -> a.getTaskResourceUsage().getCpuTimeInNanos()).mapToLong(Long::longValue).sum()
+                    )
                 );
             }
             if (shouldCollect(MetricType.MEMORY)) {
                 measurements.put(
                     MetricType.MEMORY,
-                    tasksResourceUsages.stream().map(a -> a.getTaskResourceUsage().getMemoryInBytes()).mapToLong(Long::longValue).sum()
+                    new Measurement(
+                        tasksResourceUsages.stream().map(a -> a.getTaskResourceUsage().getMemoryInBytes()).mapToLong(Long::longValue).sum()
+                    )
                 );
             }
+
+            String hashcode = QueryShapeGenerator.getShapeHashCodeAsString(request.source(), false);
+
             Map<Attribute, Object> attributes = new HashMap<>();
             attributes.put(Attribute.SEARCH_TYPE, request.searchType().toString().toLowerCase(Locale.ROOT));
             attributes.put(Attribute.SOURCE, request.source());
             attributes.put(Attribute.TOTAL_SHARDS, context.getNumShards());
             attributes.put(Attribute.INDICES, request.indices());
             attributes.put(Attribute.PHASE_LATENCY_MAP, searchRequestContext.phaseTookMap());
             attributes.put(Attribute.TASK_RESOURCE_USAGES, tasksResourceUsages);
+            attributes.put(Attribute.QUERY_HASHCODE, hashcode);
 
             Map<String, Object> labels = new HashMap<>();
             // Retrieve user provided label if exists

src/main/java/org/opensearch/plugin/insights/core/service/QueryInsightsService.java

@@ -8,6 +8,7 @@
 
 package org.opensearch.plugin.insights.core.service;
 
+import static org.opensearch.plugin.insights.settings.QueryInsightsSettings.DEFAULT_GROUPING_TYPE;
 import static org.opensearch.plugin.insights.settings.QueryInsightsSettings.getExporterSettings;
 
 import java.io.IOException;
@@ -27,6 +28,7 @@
 import org.opensearch.common.unit.TimeValue;
 import org.opensearch.plugin.insights.core.exporter.QueryInsightsExporterFactory;
 import org.opensearch.plugin.insights.core.service.categorizer.SearchQueryCategorizer;
+import org.opensearch.plugin.insights.rules.model.GroupingType;
 import org.opensearch.plugin.insights.rules.model.MetricType;
 import org.opensearch.plugin.insights.rules.model.SearchQueryRecord;
 import org.opensearch.plugin.insights.settings.QueryInsightsSettings;
@@ -73,6 +75,11 @@ public class QueryInsightsService extends AbstractLifecycleComponent {
      */
     final QueryInsightsExporterFactory queryInsightsExporterFactory;
 
+    /**
+     * Flags for enabling insight data grouping for different metric types
+     */
+    private GroupingType groupingType;
+
     private volatile boolean searchQueryMetricsEnabled;
 
     private SearchQueryCategorizer searchQueryCategorizer;
@@ -112,16 +119,17 @@ public QueryInsightsService(
 
         this.searchQueryCategorizer = SearchQueryCategorizer.getInstance(metricsRegistry);
         this.enableSearchQueryMetricsFeature(false);
+        this.groupingType = DEFAULT_GROUPING_TYPE;
     }
 
     /**
      * Ingest the query data into in-memory stores
      *
      * @param record the record to ingest
-     * @return SearchQueryRecord
+     * @return true/false
      */
     public boolean addRecord(final SearchQueryRecord record) {
-        boolean shouldAdd = searchQueryMetricsEnabled;
+        boolean shouldAdd = isSearchQueryMetricsFeatureEnabled() || isGroupingEnabled();
         if (!shouldAdd) {
             for (Map.Entry<MetricType, TopQueriesService> entry : topQueriesServices.entrySet()) {
                 if (!enableCollect.get(entry.getKey())) {
@@ -185,6 +193,67 @@ public void enableCollection(final MetricType metricType, final boolean enable)
         this.topQueriesServices.get(metricType).setEnabled(enable);
     }
 
+    /**
+     * Validate grouping given grouping type setting
+     * @param groupingTypeSetting grouping setting
+     */
+    public void validateGrouping(final String groupingTypeSetting) {
+        GroupingType.getGroupingTypeFromSettingAndValidate(groupingTypeSetting);
+    }
+
+    /**
+     * Set grouping
+     * @param groupingTypeSetting grouping
+     */
+    public void setGrouping(final String groupingTypeSetting) {
+        GroupingType newGroupingType = GroupingType.getGroupingTypeFromSettingAndValidate(groupingTypeSetting);
+        GroupingType oldGroupingType = groupingType;
+
+        if (oldGroupingType != newGroupingType) {
+            groupingType = newGroupingType;
+
+            for (MetricType metricType : MetricType.allMetricTypes()) {
+                this.topQueriesServices.get(metricType).setGrouping(newGroupingType);
+            }
+        }
+    }
+
+    /**
+     * Set max number of groups
+     * @param maxGroups maximum number of groups that should be tracked when calculating Top N groups
+     */
+    public void setMaximumGroups(final int maxGroups) {
+        for (MetricType metricType : MetricType.allMetricTypes()) {
+            this.topQueriesServices.get(metricType).setMaxGroups(maxGroups);
+        }
+    }
+
+    /**
+     * Validate max number of groups. Should be between 1 and MAX_GROUPS_LIMIT
+     * @param maxGroups maximum number of groups that should be tracked when calculating Top N groups
+     */
+    public void validateMaximumGroups(final int maxGroups) {
+        if (maxGroups < 0 || maxGroups > QueryInsightsSettings.MAX_GROUPS_EXCLUDING_TOPN_LIMIT) {
+            throw new IllegalArgumentException(
+                "Max groups setting"
+                    + " should be between 0 and "
+                    + QueryInsightsSettings.MAX_GROUPS_EXCLUDING_TOPN_LIMIT
+                    + ", was ("
+                    + maxGroups
+                    + ")"
+            );
+        }
+    }
+
+    /**
+     * Get the grouping type based on the metricType
+     * @return GroupingType
+     */
+
+    public GroupingType getGrouping() {
+        return groupingType;
+    }
+
     /**
      * Get if the Query Insights data collection is enabled for a MetricType
      *
@@ -226,9 +295,18 @@ public boolean isSearchQueryMetricsFeatureEnabled() {
         return this.searchQueryMetricsEnabled;
     }
 
+    /**
+     * Is grouping feature enabled and TopN feature enabled
+     * @return boolean
+     */
+    public boolean isGroupingEnabled() {
+        return this.groupingType != GroupingType.NONE && isTopNFeatureEnabled();
+    }
+
     /**
      * Enable/Disable search query metrics feature.
      * @param enable enable/disable search query metrics feature
+     * Stops query insights service if no features enabled
      */
     public void enableSearchQueryMetricsFeature(boolean enable) {
         searchQueryMetricsEnabled = enable;

src/main/java/org/opensearch/plugin/insights/core/service/TopQueriesService.java

@@ -24,7 +24,7 @@
 import java.util.Collection;
 import java.util.List;
 import java.util.Locale;
-import java.util.PriorityQueue;
+import java.util.concurrent.PriorityBlockingQueue;
 import java.util.concurrent.atomic.AtomicReference;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
@@ -35,6 +35,10 @@
 import org.opensearch.plugin.insights.core.exporter.QueryInsightsExporter;
 import org.opensearch.plugin.insights.core.exporter.QueryInsightsExporterFactory;
 import org.opensearch.plugin.insights.core.exporter.SinkType;
+import org.opensearch.plugin.insights.core.service.grouper.MinMaxHeapQueryGrouper;
+import org.opensearch.plugin.insights.core.service.grouper.QueryGrouper;
+import org.opensearch.plugin.insights.rules.model.AggregationType;
+import org.opensearch.plugin.insights.rules.model.GroupingType;
 import org.opensearch.plugin.insights.rules.model.MetricType;
 import org.opensearch.plugin.insights.rules.model.SearchQueryRecord;
 import org.opensearch.plugin.insights.settings.QueryInsightsSettings;
@@ -66,7 +70,7 @@ public class TopQueriesService {
     /**
      * The internal thread-safe store that holds the top n queries insight data
      */
-    private final PriorityQueue<SearchQueryRecord> topQueriesStore;
+    private final PriorityBlockingQueue<SearchQueryRecord> topQueriesStore;
 
     /**
      * The AtomicReference of a snapshot of the current window top queries for getters to consume
@@ -93,6 +97,8 @@ public class TopQueriesService {
      */
     private QueryInsightsExporter exporter;
 
+    private QueryGrouper queryGrouper;
+
     TopQueriesService(
         final MetricType metricType,
         final ThreadPool threadPool,
@@ -106,9 +112,16 @@ public class TopQueriesService {
         this.windowSize = QueryInsightsSettings.DEFAULT_WINDOW_SIZE;
         this.windowStart = -1L;
         this.exporter = null;
-        topQueriesStore = new PriorityQueue<>(topNSize, (a, b) -> SearchQueryRecord.compare(a, b, metricType));
+        topQueriesStore = new PriorityBlockingQueue<>(topNSize, (a, b) -> SearchQueryRecord.compare(a, b, metricType));
         topQueriesCurrentSnapshot = new AtomicReference<>(new ArrayList<>());
         topQueriesHistorySnapshot = new AtomicReference<>(new ArrayList<>());
+        queryGrouper = new MinMaxHeapQueryGrouper(
+            metricType,
+            QueryInsightsSettings.DEFAULT_GROUPING_TYPE,
+            AggregationType.AVERAGE,
+            topQueriesStore,
+            topNSize
+        );
     }
 
     /**
@@ -118,6 +131,7 @@ public class TopQueriesService {
      */
     public void setTopNSize(final int topNSize) {
         this.topNSize = topNSize;
+        this.queryGrouper.updateTopNSize(topNSize);
     }
 
     /**
@@ -169,6 +183,20 @@ public void setWindowSize(final TimeValue windowSize) {
         this.windowStart = -1L;
     }
 
+    public void setGrouping(final GroupingType groupingType) {
+        boolean changed = queryGrouper.setGroupingType(groupingType);
+        if (changed) {
+            drain();
+        }
+    }
+
+    public void setMaxGroups(final int maxGroups) {
+        boolean changed = queryGrouper.setMaxGroups(maxGroups);
+        if (changed) {
+            drain();
+        }
+    }
+
     /**
      * Validate if the window size is valid, based on internal constrains.
      *
@@ -306,10 +334,16 @@ void consumeRecords(final List<SearchQueryRecord> records) {
     }
 
     private void addToTopNStore(final List<SearchQueryRecord> records) {
-        topQueriesStore.addAll(records);
-        // remove top elements for fix sizing priority queue
-        while (topQueriesStore.size() > topNSize) {
-            topQueriesStore.poll();
+        if (queryGrouper.getGroupingType() != GroupingType.NONE) {
+            for (SearchQueryRecord record : records) {
+                queryGrouper.add(record);
+            }
+        } else {
+            topQueriesStore.addAll(records);
+            // remove top elements for fix sizing priority queue
+            while (topQueriesStore.size() > topNSize) {
+                topQueriesStore.poll();
+            }
         }
     }
 
@@ -329,6 +363,9 @@ private void rotateWindowIfNecessary(final long newWindowStart) {
             }
             topQueriesHistorySnapshot.set(history);
             topQueriesStore.clear();
+            if (queryGrouper.getGroupingType() != GroupingType.NONE) {
+                queryGrouper.drain();
+            }
             topQueriesCurrentSnapshot.set(new ArrayList<>());
             windowStart = newWindowStart;
             // export to the configured sink
@@ -368,4 +405,13 @@ public List<SearchQueryRecord> getTopQueriesCurrentSnapshot() {
     public void close() throws IOException {
         queryInsightsExporterFactory.closeExporter(this.exporter);
     }
+
+    /**
+     * Drain internal stores.
+     */
+    private void drain() {
+        topQueriesStore.clear();
+        topQueriesHistorySnapshot.set(new ArrayList<>());
+        topQueriesCurrentSnapshot.set(new ArrayList<>());
+    }
 }

src/main/java/org/opensearch/plugin/insights/core/service/categorizer/QueryShapeGenerator.java

@@ -90,6 +90,12 @@ public static MurmurHash3.Hash128 getShapeHashCode(SearchSourceBuilder source, B
         return MurmurHash3.hash128(shapeBytes.bytes, 0, shapeBytes.length, 0, new MurmurHash3.Hash128());
     }
 
+    public static String getShapeHashCodeAsString(SearchSourceBuilder source, Boolean showFields) {
+        MurmurHash3.Hash128 hashcode = getShapeHashCode(source, showFields);
+        String hashAsString = Long.toHexString(hashcode.h1) + Long.toHexString(hashcode.h2);
+        return hashAsString;
+    }
+
     /**
      * Method to build search query shape given a source
      * @param source search request source