Optimize downloader task executor

modules/ingest-geoip/src/main/java/org/elasticsearch/ingest/geoip/GeoIpDownloaderTaskExecutor.java

@@ -43,13 +43,14 @@
 import org.elasticsearch.threadpool.ThreadPool;
 import org.elasticsearch.transport.RemoteTransportException;
 
+import java.util.Collections;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicReference;
-import java.util.stream.Collectors;
 
 import static org.elasticsearch.ingest.geoip.GeoIpDownloader.DATABASES_INDEX;
 import static org.elasticsearch.ingest.geoip.GeoIpDownloader.GEOIP_DOWNLOADER;
@@ -238,14 +239,11 @@ public void clusterChanged(ClusterChangedEvent event) {
     }
 
     static boolean hasAtLeastOneGeoipProcessor(ClusterState clusterState) {
-        if (pipelineConfigurationsWithGeoIpProcessor(clusterState, true).isEmpty() == false) {
+        if (pipelinesWithGeoIpProcessor(clusterState, true).isEmpty() == false) {
             return true;
         }
 
-        Set<String> checkReferencedPipelines = pipelineConfigurationsWithGeoIpProcessor(clusterState, false).stream()
-            .map(PipelineConfiguration::getId)
-            .collect(Collectors.toSet());
-
+        final Set<String> checkReferencedPipelines = pipelinesWithGeoIpProcessor(clusterState, false);
         if (checkReferencedPipelines.isEmpty()) {
             return false;
         }
@@ -258,22 +256,24 @@ static boolean hasAtLeastOneGeoipProcessor(ClusterState clusterState) {
     }
 
     /**
-     * Retrieve list of pipelines that have at least one geoip processor.
+     * Retrieve the set of pipeline ids that have at least one geoip processor.
      * @param clusterState Cluster state.
      * @param downloadDatabaseOnPipelineCreation Filter the list to include only pipeline with the download_database_on_pipeline_creation
      *                                           matching the param.
-     * @return A list of {@link PipelineConfiguration} matching criteria.
+     * @return A set of pipeline ids matching criteria.
      */
     @SuppressWarnings("unchecked")
-    private static List<PipelineConfiguration> pipelineConfigurationsWithGeoIpProcessor(
-        ClusterState clusterState,
-        boolean downloadDatabaseOnPipelineCreation
-    ) {
-        List<PipelineConfiguration> pipelineDefinitions = IngestService.getPipelines(clusterState);
-        return pipelineDefinitions.stream().filter(pipelineConfig -> {
-            List<Map<String, Object>> processors = (List<Map<String, Object>>) pipelineConfig.getConfigAsMap().get(Pipeline.PROCESSORS_KEY);
-            return hasAtLeastOneGeoipProcessor(processors, downloadDatabaseOnPipelineCreation);
-        }).toList();
+    private static Set<String> pipelinesWithGeoIpProcessor(ClusterState clusterState, boolean downloadDatabaseOnPipelineCreation) {
+        List<PipelineConfiguration> configurations = IngestService.getPipelines(clusterState);
+        Set<String> ids = new HashSet<>();
+        // note: this loop is unrolled rather than streaming-style because it's hot enough to show up in a flamegraph
+        for (PipelineConfiguration configuration : configurations) {
+            List<Map<String, Object>> processors = (List<Map<String, Object>>) configuration.getConfigAsMap().get(Pipeline.PROCESSORS_KEY);
+            if (hasAtLeastOneGeoipProcessor(processors, downloadDatabaseOnPipelineCreation)) {
+                ids.add(configuration.getId());
+            }
+        }
+        return Collections.unmodifiableSet(ids);
     }
 
     /**
@@ -283,7 +283,15 @@ private static List<PipelineConfiguration> pipelineConfigurationsWithGeoIpProces
      * @return true if a geoip processor is found in the processor list.
      */
     private static boolean hasAtLeastOneGeoipProcessor(List<Map<String, Object>> processors, boolean downloadDatabaseOnPipelineCreation) {
-        return processors != null && processors.stream().anyMatch(p -> hasAtLeastOneGeoipProcessor(p, downloadDatabaseOnPipelineCreation));
+        if (processors != null) {
+            // note: this loop is unrolled rather than streaming-style because it's hot enough to show up in a flamegraph
+            for (Map<String, Object> processor : processors) {
+                if (hasAtLeastOneGeoipProcessor(processor, downloadDatabaseOnPipelineCreation)) {
+                    return true;
+                }
+            }
+        }
+        return false;
     }
 
     /**
@@ -317,7 +325,7 @@ private static boolean hasAtLeastOneGeoipProcessor(Map<String, Object> processor
     }
 
     /**
-     * Check if a processor config is has an on_failure clause containing at least a geoip processor.
+     * Check if a processor config has an on_failure clause containing at least a geoip processor.
      * @param processor Processor config.
      * @param downloadDatabaseOnPipelineCreation Should the download_database_on_pipeline_creation of the geoip processor be true or false.
      * @return true if a geoip processor is found in the processor list.
@@ -327,16 +335,17 @@ private static boolean isProcessorWithOnFailureGeoIpProcessor(
         Map<String, Object> processor,
         boolean downloadDatabaseOnPipelineCreation
     ) {
-        return processor != null
-            && processor.values()
-                .stream()
-                .anyMatch(
-                    value -> value instanceof Map
-                        && hasAtLeastOneGeoipProcessor(
-                            ((Map<String, List<Map<String, Object>>>) value).get("on_failure"),
-                            downloadDatabaseOnPipelineCreation
-                        )
-                );
+        // note: this loop is unrolled rather than streaming-style because it's hot enough to show up in a flamegraph
+        for (Object value : processor.values()) {
+            if (value instanceof Map
+                && hasAtLeastOneGeoipProcessor(
+                    ((Map<String, List<Map<String, Object>>>) value).get("on_failure"),
+                    downloadDatabaseOnPipelineCreation
+                )) {
+                return true;
+            }
+        }
+        return false;
     }
 
     /**

server/src/main/java/org/elasticsearch/ingest/ConfigurationUtils.java

@@ -12,6 +12,7 @@
 import org.elasticsearch.ElasticsearchException;
 import org.elasticsearch.ElasticsearchParseException;
 import org.elasticsearch.ExceptionsHelper;
+import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.bytes.BytesReference;
 import org.elasticsearch.common.util.Maps;
 import org.elasticsearch.common.xcontent.LoggingDeprecationHandler;
@@ -239,7 +240,7 @@ private static Boolean readBoolean(String processorType, String processorTag, St
             processorType,
             processorTag,
             propertyName,
-            "property isn't a boolean, but of type [" + value.getClass().getName() + "]"
+            Strings.format("property isn't a boolean, but of type [%s]", value.getClass().getName())
         );
     }