[Backport 2.x] Reduce logging in DEBUG for MasterService:run

CHANGELOG.md

@@ -21,6 +21,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Add Plugin interface for loading application based configuration templates (([#14659](https://github.com/opensearch-project/OpenSearch/issues/14659)))
 - Add prefix mode verification setting for repository verification (([#14790](https://github.com/opensearch-project/OpenSearch/pull/14790)))
 - Optimize TransportNodesAction to not send DiscoveryNodes for NodeStats, NodesInfo and ClusterStats call ([14749](https://github.com/opensearch-project/OpenSearch/pull/14749))
+- Reduce logging in DEBUG for MasterService:run ([#14795](https://github.com/opensearch-project/OpenSearch/pull/14795))
 
 ### Dependencies
 - Update to Apache Lucene 9.11.1 ([#14042](https://github.com/opensearch-project/OpenSearch/pull/14042), [#14576](https://github.com/opensearch-project/OpenSearch/pull/14576))

server/src/main/java/org/opensearch/cluster/service/MasterService.java

@@ -84,6 +84,7 @@
 import java.util.Objects;
 import java.util.Optional;
 import java.util.concurrent.TimeUnit;
+import java.util.function.Function;
 import java.util.function.Supplier;
 import java.util.stream.Collectors;
 
@@ -221,10 +222,10 @@ protected void onTimeout(List<? extends BatchedTask> tasks, TimeValue timeout) {
         }
 
         @Override
-        protected void run(Object batchingKey, List<? extends BatchedTask> tasks, String tasksSummary) {
+        protected void run(Object batchingKey, List<? extends BatchedTask> tasks, Function<Boolean, String> taskSummaryGenerator) {
             ClusterStateTaskExecutor<Object> taskExecutor = (ClusterStateTaskExecutor<Object>) batchingKey;
             List<UpdateTask> updateTasks = (List<UpdateTask>) tasks;
-            runTasks(new TaskInputs(taskExecutor, updateTasks, tasksSummary));
+            runTasks(new TaskInputs(taskExecutor, updateTasks, taskSummaryGenerator));
         }
 
         class UpdateTask extends BatchedTask {
@@ -297,26 +298,33 @@ public static boolean assertNotMasterUpdateThread(String reason) {
     }
 
     private void runTasks(TaskInputs taskInputs) {
-        final String summary = taskInputs.summary;
+        final String longSummary = logger.isTraceEnabled() ? taskInputs.taskSummaryGenerator.apply(true) : "";
+        final String shortSummary = taskInputs.taskSummaryGenerator.apply(false);
+
         if (!lifecycle.started()) {
-            logger.debug("processing [{}]: ignoring, cluster-manager service not started", summary);
+            logger.debug("processing [{}]: ignoring, cluster-manager service not started", shortSummary);
             return;
         }
 
-        logger.debug("executing cluster state update for [{}]", summary);
+        if (logger.isTraceEnabled()) {
+            logger.trace("executing cluster state update for [{}]", longSummary);
+        } else {
+            logger.debug("executing cluster state update for [{}]", shortSummary);
+        }
+
         final ClusterState previousClusterState = state();
 
         if (!previousClusterState.nodes().isLocalNodeElectedClusterManager() && taskInputs.runOnlyWhenClusterManager()) {
-            logger.debug("failing [{}]: local node is no longer cluster-manager", summary);
+            logger.debug("failing [{}]: local node is no longer cluster-manager", shortSummary);
             taskInputs.onNoLongerClusterManager();
             return;
         }
 
         final long computationStartTime = threadPool.preciseRelativeTimeInNanos();
-        final TaskOutputs taskOutputs = calculateTaskOutputs(taskInputs, previousClusterState);
+        final TaskOutputs taskOutputs = calculateTaskOutputs(taskInputs, previousClusterState, shortSummary);
         taskOutputs.notifyFailedTasks();
         final TimeValue computationTime = getTimeSince(computationStartTime);
-        logExecutionTime(computationTime, "compute cluster state update", summary);
+        logExecutionTime(computationTime, "compute cluster state update", shortSummary);
 
         clusterManagerMetrics.recordLatency(
             clusterManagerMetrics.clusterStateComputeHistogram,
@@ -328,25 +336,25 @@ private void runTasks(TaskInputs taskInputs) {
             final long notificationStartTime = threadPool.preciseRelativeTimeInNanos();
             taskOutputs.notifySuccessfulTasksOnUnchangedClusterState();
             final TimeValue executionTime = getTimeSince(notificationStartTime);
-            logExecutionTime(executionTime, "notify listeners on unchanged cluster state", summary);
+            logExecutionTime(executionTime, "notify listeners on unchanged cluster state", shortSummary);
         } else {
             final ClusterState newClusterState = taskOutputs.newClusterState;
             if (logger.isTraceEnabled()) {
-                logger.trace("cluster state updated, source [{}]\n{}", summary, newClusterState);
+                logger.trace("cluster state updated, source [{}]\n{}", longSummary, newClusterState);
             } else {
-                logger.debug("cluster state updated, version [{}], source [{}]", newClusterState.version(), summary);
+                logger.debug("cluster state updated, version [{}], source [{}]", newClusterState.version(), shortSummary);
             }
             final long publicationStartTime = threadPool.preciseRelativeTimeInNanos();
             try {
-                ClusterChangedEvent clusterChangedEvent = new ClusterChangedEvent(summary, newClusterState, previousClusterState);
+                ClusterChangedEvent clusterChangedEvent = new ClusterChangedEvent(shortSummary, newClusterState, previousClusterState);
                 // new cluster state, notify all listeners
                 final DiscoveryNodes.Delta nodesDelta = clusterChangedEvent.nodesDelta();
                 if (nodesDelta.hasChanges() && logger.isInfoEnabled()) {
                     String nodesDeltaSummary = nodesDelta.shortSummary();
                     if (nodesDeltaSummary.length() > 0) {
                         logger.info(
                             "{}, term: {}, version: {}, delta: {}",
-                            summary,
+                            shortSummary,
                             newClusterState.term(),
                             newClusterState.version(),
                             nodesDeltaSummary
@@ -357,7 +365,7 @@ private void runTasks(TaskInputs taskInputs) {
                 logger.debug("publishing cluster state version [{}]", newClusterState.version());
                 publish(clusterChangedEvent, taskOutputs, publicationStartTime);
             } catch (Exception e) {
-                handleException(summary, publicationStartTime, newClusterState, e);
+                handleException(shortSummary, publicationStartTime, newClusterState, e);
             }
         }
     }
@@ -452,8 +460,8 @@ private void handleException(String summary, long startTimeMillis, ClusterState
         // TODO: do we want to call updateTask.onFailure here?
     }
 
-    private TaskOutputs calculateTaskOutputs(TaskInputs taskInputs, ClusterState previousClusterState) {
-        ClusterTasksResult<Object> clusterTasksResult = executeTasks(taskInputs, previousClusterState);
+    private TaskOutputs calculateTaskOutputs(TaskInputs taskInputs, ClusterState previousClusterState, String taskSummary) {
+        ClusterTasksResult<Object> clusterTasksResult = executeTasks(taskInputs, previousClusterState, taskSummary);
         ClusterState newClusterState = patchVersions(previousClusterState, clusterTasksResult);
         return new TaskOutputs(
             taskInputs,
@@ -897,7 +905,7 @@ public void onTimeout() {
         }
     }
 
-    private ClusterTasksResult<Object> executeTasks(TaskInputs taskInputs, ClusterState previousClusterState) {
+    private ClusterTasksResult<Object> executeTasks(TaskInputs taskInputs, ClusterState previousClusterState, String taskSummary) {
         ClusterTasksResult<Object> clusterTasksResult;
         try {
             List<Object> inputs = taskInputs.updateTasks.stream().map(tUpdateTask -> tUpdateTask.task).collect(Collectors.toList());
@@ -913,7 +921,7 @@ private ClusterTasksResult<Object> executeTasks(TaskInputs taskInputs, ClusterSt
                     "failed to execute cluster state update (on version: [{}], uuid: [{}]) for [{}]\n{}{}{}",
                     previousClusterState.version(),
                     previousClusterState.stateUUID(),
-                    taskInputs.summary,
+                    taskSummary,
                     previousClusterState.nodes(),
                     previousClusterState.routingTable(),
                     previousClusterState.getRoutingNodes()
@@ -955,14 +963,19 @@ private List<Batcher.UpdateTask> getNonFailedTasks(TaskInputs taskInputs, Cluste
      * Represents a set of tasks to be processed together with their executor
      */
     private class TaskInputs {
-        final String summary;
+
         final List<Batcher.UpdateTask> updateTasks;
         final ClusterStateTaskExecutor<Object> executor;
+        final Function<Boolean, String> taskSummaryGenerator;
 
-        TaskInputs(ClusterStateTaskExecutor<Object> executor, List<Batcher.UpdateTask> updateTasks, String summary) {
-            this.summary = summary;
+        TaskInputs(
+            ClusterStateTaskExecutor<Object> executor,
+            List<Batcher.UpdateTask> updateTasks,
+            final Function<Boolean, String> taskSummaryGenerator
+        ) {
             this.executor = executor;
             this.updateTasks = updateTasks;
+            this.taskSummaryGenerator = taskSummaryGenerator;
         }
 
         boolean runOnlyWhenClusterManager() {

server/src/main/java/org/opensearch/cluster/service/TaskBatcher.java

@@ -177,7 +177,6 @@ void runIfNotProcessed(BatchedTask updateTask) {
         // to give other tasks with different batching key a chance to execute.
         if (updateTask.processed.get() == false) {
             final List<BatchedTask> toExecute = new ArrayList<>();
-            final Map<String, List<BatchedTask>> processTasksBySource = new HashMap<>();
             // While removing task, need to remove task first from taskMap and then remove identity from identityMap.
             // Changing this order might lead to duplicate task during submission.
             LinkedHashSet<BatchedTask> pending = tasksPerBatchingKey.remove(updateTask.batchingKey);
@@ -187,30 +186,41 @@ void runIfNotProcessed(BatchedTask updateTask) {
                     if (task.processed.getAndSet(true) == false) {
                         logger.trace("will process {}", task);
                         toExecute.add(task);
-                        processTasksBySource.computeIfAbsent(task.source, s -> new ArrayList<>()).add(task);
                     } else {
                         logger.trace("skipping {}, already processed", task);
                     }
                 }
             }
 
             if (toExecute.isEmpty() == false) {
-                final String tasksSummary = processTasksBySource.entrySet().stream().map(entry -> {
-                    String tasks = updateTask.describeTasks(entry.getValue());
-                    return tasks.isEmpty() ? entry.getKey() : entry.getKey() + "[" + tasks + "]";
-                }).reduce((s1, s2) -> s1 + ", " + s2).orElse("");
-
+                Function<Boolean, String> taskSummaryGenerator = (longSummaryRequired) -> {
+                    if (longSummaryRequired == null || !longSummaryRequired) {
+                        return buildShortSummary(updateTask.batchingKey, toExecute.size());
+                    }
+                    final Map<String, List<BatchedTask>> processTasksBySource = new HashMap<>();
+                    for (final BatchedTask task : toExecute) {
+                        processTasksBySource.computeIfAbsent(task.source, s -> new ArrayList<>()).add(task);
+                    }
+                    return processTasksBySource.entrySet().stream().map(entry -> {
+                        String tasks = updateTask.describeTasks(entry.getValue());
+                        return tasks.isEmpty() ? entry.getKey() : entry.getKey() + "[" + tasks + "]";
+                    }).reduce((s1, s2) -> s1 + ", " + s2).orElse("");
+                };
                 taskBatcherListener.onBeginProcessing(toExecute);
-                run(updateTask.batchingKey, toExecute, tasksSummary);
+                run(updateTask.batchingKey, toExecute, taskSummaryGenerator);
             }
         }
     }
 
+    private String buildShortSummary(final Object batchingKey, final int taskCount) {
+        return "Tasks batched with key: " + batchingKey.toString().split("\\$")[0] + " and count: " + taskCount;
+    }
+
     /**
      * Action to be implemented by the specific batching implementation
      * All tasks have the given batching key.
      */
-    protected abstract void run(Object batchingKey, List<? extends BatchedTask> tasks, String tasksSummary);
+    protected abstract void run(Object batchingKey, List<? extends BatchedTask> tasks, Function<Boolean, String> taskSummaryGenerator);
 
     /**
      * Represents a runnable task that supports batching.