Add extra logging to `testChildrenTasksCancelledOnTimeout` (#128888)

Relates #123568

muted-tests.yml

@@ -204,9 +204,6 @@ tests:
 - class: org.elasticsearch.packaging.test.DockerTests
   method: test151MachineDependentHeapWithSizeOverride
   issue: https://github.com/elastic/elasticsearch/issues/123437
-- class: org.elasticsearch.action.admin.cluster.node.tasks.CancellableTasksIT
-  method: testChildrenTasksCancelledOnTimeout
-  issue: https://github.com/elastic/elasticsearch/issues/123568
 - class: org.elasticsearch.xpack.searchablesnapshots.FrozenSearchableSnapshotsIntegTests
   method: testCreateAndRestorePartialSearchableSnapshot
   issue: https://github.com/elastic/elasticsearch/issues/123773

server/src/internalClusterTest/java/org/elasticsearch/action/admin/cluster/node/tasks/CancellableTasksIT.java

@@ -17,6 +17,7 @@ import org.elasticsearch.action.ActionListenerResponseHandler;
 import org.elasticsearch.action.ActionRequestValidationException;
 import org.elasticsearch.action.ActionResponse;
 import org.elasticsearch.action.ActionType;
+import org.elasticsearch.action.DelegatingActionListener;
 import org.elasticsearch.action.LatchedActionListener;
 import org.elasticsearch.action.LegacyActionRequest;
 import org.elasticsearch.action.admin.cluster.node.tasks.list.ListTasksResponse;
@@ -26,6 +27,7 @@ import org.elasticsearch.action.support.HandledTransportAction;
 import org.elasticsearch.action.support.PlainActionFuture;
 import org.elasticsearch.client.internal.node.NodeClient;
 import org.elasticsearch.cluster.node.DiscoveryNode;
+import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.common.util.CollectionUtils;
@@ -34,6 +36,8 @@ import org.elasticsearch.common.util.concurrent.ConcurrentCollections;
 import org.elasticsearch.common.util.set.Sets;
 import org.elasticsearch.core.TimeValue;
 import org.elasticsearch.injection.guice.Inject;
+import org.elasticsearch.logging.LogManager;
+import org.elasticsearch.logging.Logger;
 import org.elasticsearch.plugins.ActionPlugin;
 import org.elasticsearch.plugins.Plugin;
 import org.elasticsearch.tasks.CancellableTask;
@@ -43,6 +47,7 @@ import org.elasticsearch.tasks.TaskId;
 import org.elasticsearch.tasks.TaskInfo;
 import org.elasticsearch.tasks.TaskManager;
 import org.elasticsearch.test.ESIntegTestCase;
+import org.elasticsearch.test.junit.annotations.TestIssueLogging;
 import org.elasticsearch.threadpool.ThreadPool;
 import org.elasticsearch.transport.ReceiveTimeoutTransportException;
 import org.elasticsearch.transport.SendRequestTransportException;
@@ -74,6 +79,9 @@ import static org.hamcrest.Matchers.hasSize;
 @ESIntegTestCase.ClusterScope(scope = ESIntegTestCase.Scope.TEST)
 public class CancellableTasksIT extends ESIntegTestCase {
 
+    // Temporary addition for investigation into https://github.com/elastic/elasticsearch/issues/123568
+    private static final Logger logger = LogManager.getLogger(CancellableTasksIT.class);
+
     static int idGenerator = 0;
     static final Map<TestRequest, CountDownLatch> beforeSendLatches = ConcurrentCollections.newConcurrentMap();
     static final Map<TestRequest, CountDownLatch> arrivedLatches = ConcurrentCollections.newConcurrentMap();
@@ -366,18 +374,42 @@ public class CancellableTasksIT extends ESIntegTestCase {
         }
     }
 
+    @TestIssueLogging(
+        issueUrl = "https://github.com/elastic/elasticsearch/issues/123568",
+        value = "org.elasticsearch.transport.TransportService.tracer:TRACE"
+            + ",org.elasticsearch.tasks.TaskManager:TRACE"
+            + ",org.elasticsearch.action.admin.cluster.node.tasks.CancellableTasksIT:DEBUG"
+    )
     public void testChildrenTasksCancelledOnTimeout() throws Exception {
         Set<DiscoveryNode> nodes = clusterService().state().nodes().stream().collect(Collectors.toSet());
         final TestRequest rootRequest = generateTestRequest(nodes, 0, between(1, 4), true);
+        logger.info("generated request\n{}", buildTestRequestDescription(rootRequest, "", new StringBuilder()).toString());
         ActionFuture<TestResponse> rootTaskFuture = client().execute(TransportTestAction.ACTION, rootRequest);
+        logger.info("action executed");
         allowEntireRequest(rootRequest);
+        logger.info("execution released");
         waitForRootTask(rootTaskFuture, true);
+        logger.info("root task completed");
         ensureBansAndCancellationsConsistency();
+        logger.info("ensureBansAndCancellationsConsistency completed");
 
         // Make sure all descendent requests have completed
         for (TestRequest subRequest : rootRequest.descendants()) {
+            logger.info("awaiting completion of request {}", subRequest.getDescription());
             safeAwait(completedLatches.get(subRequest));
         }
+        logger.info("all requests completed");
+    }
+
+    // Temporary addition for investigation into https://github.com/elastic/elasticsearch/issues/123568
+    static StringBuilder buildTestRequestDescription(TestRequest request, String prefix, StringBuilder stringBuilder) {
+        stringBuilder.append(prefix)
+            .append(Strings.format("id=%d [timeout=%s] %s", request.id, request.timeout, request.node.descriptionWithoutAttributes()))
+            .append('\n');
+        for (TestRequest subRequest : request.subRequests) {
+            buildTestRequestDescription(subRequest, prefix + "  ", stringBuilder);
+        }
+        return stringBuilder;
     }
 
     static TaskId getRootTaskId(TestRequest request) throws Exception {
@@ -506,6 +538,8 @@ public class CancellableTasksIT extends ESIntegTestCase {
 
     public static class TransportTestAction extends HandledTransportAction<TestRequest, TestResponse> {
 
+        private static final Logger logger = CancellableTasksIT.logger;
+
         public static ActionType<TestResponse> ACTION = new ActionType<>("internal::test_action");
         private final TransportService transportService;
         private final NodeClient client;
@@ -565,7 +599,22 @@ public class CancellableTasksIT extends ESIntegTestCase {
         protected void startSubTask(TaskId parentTaskId, TestRequest subRequest, ActionListener<TestResponse> listener) {
             subRequest.setParentTask(parentTaskId);
             CountDownLatch completeLatch = completedLatches.get(subRequest);
-            LatchedActionListener<TestResponse> latchedListener = new LatchedActionListener<>(listener, completeLatch);
+            ActionListener<TestResponse> latchedListener = new DelegatingActionListener<>(
+                new LatchedActionListener<>(listener, completeLatch)
+            ) {
+                // Temporary logging addition for investigation into https://github.com/elastic/elasticsearch/issues/123568
+                @Override
+                public void onResponse(TestResponse testResponse) {
+                    logger.debug("processing successful response to request [{}]", subRequest.getDescription());
+                    delegate.onResponse(testResponse);
+                }
+
+                @Override
+                public void onFailure(Exception e) {
+                    logger.debug("processing exceptional response to request [{}]: {}", subRequest.getDescription(), e.getMessage());
+                    super.onFailure(e);
+                }
+            };
             transportService.getThreadPool().generic().execute(new AbstractRunnable() {
                 @Override
                 public void onFailure(Exception e) {
@@ -596,6 +645,13 @@ public class CancellableTasksIT extends ESIntegTestCase {
                                 TransportResponseHandler.TRANSPORT_WORKER
                             )
                         );
+                        // Temporary addition for investigation into https://github.com/elastic/elasticsearch/issues/123568
+                        logger.debug(
+                            "sent test request [{}] from [{}] to [{}]",
+                            subRequest.getDescription(),
+                            client.getLocalNodeId(),
+                            subRequest.node.descriptionWithoutAttributes()
+                        );
                     }
                 }
             });