Move get lifecycle API to Management thread pool and make cancellable (…

…elastic#97248) * Move get lifecycle API to Management thread pool and make cancellable This commit moves the `TransportGetLifecycleAction` to execute on the `Management` thread pool, and to be cancellable so that wildcard requests looping through all or a subset of policies checks for cancellation while running. Resolves elastic#96568
dakrone · Jun 30, 2023 · 869ad83 · 869ad83
1 parent 75cb6fe
commit 869ad83
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Showing 4 changed files with 32 additions and 2 deletions.
diff --git a/docs/changelog/97248.yaml b/docs/changelog/97248.yaml
@@ -0,0 +1,6 @@
+pr: 97248
+summary: Move get lifecycle API to Management thread pool and make cancellable
+area: ILM+SLM
+type: enhancement
+issues:
+ - 96568
diff --git a/...plugin/core/src/main/java/org/elasticsearch/xpack/core/ilm/action/GetLifecycleAction.java b/...plugin/core/src/main/java/org/elasticsearch/xpack/core/ilm/action/GetLifecycleAction.java
@@ -16,13 +16,17 @@
 import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.common.io.stream.Writeable;
+import org.elasticsearch.tasks.CancellableTask;
+import org.elasticsearch.tasks.Task;
+import org.elasticsearch.tasks.TaskId;
 import org.elasticsearch.xcontent.ToXContentObject;
 import org.elasticsearch.xcontent.XContentBuilder;
 import org.elasticsearch.xpack.core.ilm.LifecyclePolicy;
 
 import java.io.IOException;
 import java.util.Arrays;
 import java.util.List;
+import java.util.Map;
 import java.util.Objects;
 
 public class GetLifecycleAction extends ActionType<GetLifecycleAction.Response> {
@@ -113,6 +117,11 @@ public Request() {
             policyNames = Strings.EMPTY_ARRAY;
         }
 
+        @Override
+        public Task createTask(long id, String type, String action, TaskId parentTaskId, Map<String, String> headers) {
+            return new CancellableTask(id, type, action, "get-lifecycle-task", parentTaskId, headers);
+        }
+
         public String[] getPolicyNames() {
             return policyNames;
         }

diff --git a/...k/plugin/ilm/src/main/java/org/elasticsearch/xpack/ilm/action/RestGetLifecycleAction.java b/...k/plugin/ilm/src/main/java/org/elasticsearch/xpack/ilm/action/RestGetLifecycleAction.java
@@ -11,6 +11,7 @@
 import org.elasticsearch.common.Strings;
 import org.elasticsearch.rest.BaseRestHandler;
 import org.elasticsearch.rest.RestRequest;
+import org.elasticsearch.rest.action.RestCancellableNodeClient;
 import org.elasticsearch.rest.action.RestToXContentListener;
 import org.elasticsearch.xpack.core.ilm.action.GetLifecycleAction;
 
@@ -37,6 +38,10 @@ protected RestChannelConsumer prepareRequest(RestRequest restRequest, NodeClient
         getLifecycleRequest.timeout(restRequest.paramAsTime("timeout", getLifecycleRequest.timeout()));
         getLifecycleRequest.masterNodeTimeout(restRequest.paramAsTime("master_timeout", getLifecycleRequest.masterNodeTimeout()));
 
-        return channel -> client.execute(GetLifecycleAction.INSTANCE, getLifecycleRequest, new RestToXContentListener<>(channel));
+        return channel -> new RestCancellableNodeClient(client, restRequest.getHttpChannel()).execute(
+            GetLifecycleAction.INSTANCE,
+            getLifecycleRequest,
+            new RestToXContentListener<>(channel)
+        );
     }
 }
diff --git a/...gin/ilm/src/main/java/org/elasticsearch/xpack/ilm/action/TransportGetLifecycleAction.java b/...gin/ilm/src/main/java/org/elasticsearch/xpack/ilm/action/TransportGetLifecycleAction.java
@@ -18,6 +18,7 @@
 import org.elasticsearch.cluster.service.ClusterService;
 import org.elasticsearch.common.inject.Inject;
 import org.elasticsearch.common.regex.Regex;
+import org.elasticsearch.tasks.CancellableTask;
 import org.elasticsearch.tasks.Task;
 import org.elasticsearch.threadpool.ThreadPool;
 import org.elasticsearch.transport.TransportService;
@@ -55,12 +56,18 @@ public TransportGetLifecycleAction(
             Request::new,
             indexNameExpressionResolver,
             Response::new,
-            ThreadPool.Names.SAME
+            ThreadPool.Names.MANAGEMENT
         );
     }
 
     @Override
     protected void masterOperation(Task task, Request request, ClusterState state, ActionListener<Response> listener) {
+        assert task instanceof CancellableTask : "get lifecycle requests should be cancellable";
+        final CancellableTask cancellableTask = (CancellableTask) task;
+        if (cancellableTask.notifyIfCancelled(listener)) {
+            return;
+        }
+
         IndexLifecycleMetadata metadata = clusterService.state().metadata().custom(IndexLifecycleMetadata.TYPE);
         if (metadata == null) {
             if (request.getPolicyNames().length == 0) {
@@ -88,6 +95,9 @@ protected void masterOperation(Task task, Request request, ClusterState state, A
             for (String name : names) {
                 if (Regex.isSimpleMatchPattern(name)) {
                     for (Map.Entry<String, LifecyclePolicyMetadata> entry : metadata.getPolicyMetadatas().entrySet()) {
+                        if (cancellableTask.notifyIfCancelled(listener)) {
+                            return;
+                        }
                         LifecyclePolicyMetadata policyMetadata = entry.getValue();
                         if (Regex.simpleMatch(name, entry.getKey())) {
                             policyResponseItemMap.put(