Effort to fix testDataStreamLifecycleDownsampleRollingRestart elastic#123769 (elastic#125478)

(cherry picked from commit 1943844)

# Conflicts:
#	muted-tests.yml
#	x-pack/plugin/downsample/src/internalClusterTest/java/org/elasticsearch/xpack/downsample/DataStreamLifecycleDownsampleDisruptionIT.java

Author: gmarouli

test/framework/src/main/java/org/elasticsearch/test/ESTestCase.java

@@ -2424,9 +2424,19 @@ public static void safeAcquire(int permits, Semaphore semaphore) {
      * @return The value with which the {@code listener} was completed.
      */
     public static <T> T safeAwait(SubscribableListener<T> listener) {
+        return safeAwait(listener, SAFE_AWAIT_TIMEOUT.getMillis(), TimeUnit.MILLISECONDS);
+    }
+
+    /**
+     * Wait for the successful completion of the given {@link SubscribableListener}, respecting the provided timeout,
+     * preserving the thread's interrupt status flag and converting all exceptions into an {@link AssertionError} to trigger a test failure.
+     *
+     * @return The value with which the {@code listener} was completed.
+     */
+    public static <T> T safeAwait(SubscribableListener<T> listener, long timeout, TimeUnit unit) {
         final var future = new TestPlainActionFuture<T>();
         listener.addListener(future);
-        return safeGet(future);
+        return safeGet(future, timeout, unit);
     }
 
     /**
@@ -2456,8 +2466,18 @@ public static <T extends ActionResponse> T safeExecute(ElasticsearchClient clien
      * @return The value with which the {@code future} was completed.
      */
     public static <T> T safeGet(Future<T> future) {
+        return safeGet(future, SAFE_AWAIT_TIMEOUT.millis(), TimeUnit.MILLISECONDS);
+    }
+
+    /**
+     * Wait for the successful completion of the given {@link Future}, respecting the provided timeout, preserving the
+     * thread's interrupt status flag and converting all exceptions into an {@link AssertionError} to trigger a test failure.
+     *
+     * @return The value with which the {@code future} was completed.
+     */
+    public static <T> T safeGet(Future<T> future, long timeout, TimeUnit unit) {
         try {
-            return future.get(SAFE_AWAIT_TIMEOUT.millis(), TimeUnit.MILLISECONDS);
+            return future.get(timeout, unit);
         } catch (InterruptedException e) {
             Thread.currentThread().interrupt();
             throw new AssertionError("safeGet: interrupted waiting for SubscribableListener", e);

x-pack/plugin/downsample/src/internalClusterTest/java/org/elasticsearch/xpack/downsample/DataStreamLifecycleDownsampleDisruptionIT.java

@@ -11,37 +11,34 @@
 import org.apache.logging.log4j.Logger;
 import org.elasticsearch.action.admin.indices.rollover.RolloverAction;
 import org.elasticsearch.action.admin.indices.rollover.RolloverRequest;
-import org.elasticsearch.action.admin.indices.settings.get.GetSettingsRequest;
-import org.elasticsearch.action.admin.indices.settings.get.GetSettingsResponse;
 import org.elasticsearch.action.downsample.DownsampleConfig;
-import org.elasticsearch.action.support.IndicesOptions;
 import org.elasticsearch.cluster.metadata.DataStreamLifecycle;
 import org.elasticsearch.cluster.metadata.IndexMetadata;
+import org.elasticsearch.cluster.service.ClusterService;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.core.TimeValue;
 import org.elasticsearch.datastreams.DataStreamsPlugin;
 import org.elasticsearch.datastreams.lifecycle.DataStreamLifecycleService;
 import org.elasticsearch.plugins.Plugin;
 import org.elasticsearch.search.aggregations.bucket.histogram.DateHistogramInterval;
+import org.elasticsearch.test.ClusterServiceUtils;
 import org.elasticsearch.test.ESIntegTestCase;
 import org.elasticsearch.test.InternalTestCluster;
-import org.elasticsearch.test.junit.annotations.TestLogging;
 import org.elasticsearch.xpack.aggregatemetric.AggregateMetricMapperPlugin;
 import org.elasticsearch.xpack.core.LocalStateCompositeXPackPlugin;
 
 import java.util.Collection;
 import java.util.List;
 import java.util.concurrent.TimeUnit;
 
+import static org.elasticsearch.cluster.metadata.IndexMetadata.INDEX_DOWNSAMPLE_STATUS;
 import static org.elasticsearch.xpack.downsample.DataStreamLifecycleDriver.getBackingIndices;
 import static org.elasticsearch.xpack.downsample.DataStreamLifecycleDriver.putTSDBIndexTemplate;
-import static org.hamcrest.Matchers.is;
-import static org.hamcrest.Matchers.notNullValue;
 
 @ESIntegTestCase.ClusterScope(scope = ESIntegTestCase.Scope.TEST, numDataNodes = 0, numClientNodes = 4)
 public class DataStreamLifecycleDownsampleDisruptionIT extends ESIntegTestCase {
     private static final Logger logger = LogManager.getLogger(DataStreamLifecycleDownsampleDisruptionIT.class);
-    public static final int DOC_COUNT = 50_000;
+    public static final int DOC_COUNT = 25_000;
 
     @Override
     protected Collection<Class<? extends Plugin>> nodePlugins() {
@@ -55,7 +52,6 @@ protected Settings nodeSettings(int nodeOrdinal, Settings otherSettings) {
         return settings.build();
     }
 
-    @TestLogging(value = "org.elasticsearch.datastreams.lifecycle:TRACE", reason = "debugging")
     public void testDataStreamLifecycleDownsampleRollingRestart() throws Exception {
         final InternalTestCluster cluster = internalCluster();
         cluster.startMasterOnlyNodes(1);
@@ -88,36 +84,38 @@ public void testDataStreamLifecycleDownsampleRollingRestart() throws Exception {
         // testing so DSL doesn't have to wait for the end_time to lapse)
         putTSDBIndexTemplate(client(), dataStreamName, null, null, lifecycle);
         client().execute(RolloverAction.INSTANCE, new RolloverRequest(dataStreamName, null)).actionGet();
+        String sourceIndex = getBackingIndices(client(), dataStreamName).get(0);
+        final String targetIndex = "downsample-5m-" + sourceIndex;
 
-        // DSL runs every second and it has to tail forcemerge the index (2 seconds) and mark it as read-only (2s) before it starts
-        // downsampling. This sleep here tries to get as close as possible to having disruption during the downsample execution.
-        long sleepTime = randomLongBetween(3000, 4500);
-        logger.info("-> giving data stream lifecycle [{}] millis to make some progress before starting the disruption", sleepTime);
-        Thread.sleep(sleepTime);
-        List<String> backingIndices = getBackingIndices(client(), dataStreamName);
-        // first generation index
-        String sourceIndex = backingIndices.get(0);
+        /**
+         * DLM runs every second and it has to tail forcemerge the index (2 seconds) and mark it as read-only (2s) before it starts
+         * downsampling. We try to detect if the downsampling has started by checking the downsample status in the target index.
+         */
+        logger.info("-> Waiting for the data stream lifecycle to start the downsampling operation before starting the disruption.");
+        ensureDownsamplingStatus(targetIndex, IndexMetadata.DownsampleTaskStatus.STARTED, TimeValue.timeValueSeconds(8));
 
-        internalCluster().rollingRestart(new InternalTestCluster.RestartCallback() {
-        });
+        logger.info("-> Starting the disruption.");
+        internalCluster().rollingRestart(new InternalTestCluster.RestartCallback());
 
-        // if the source index has already been downsampled and moved into the data stream just use its name directly
-        final String targetIndex = sourceIndex.startsWith("downsample-5m-") ? sourceIndex : "downsample-5m-" + sourceIndex;
-        assertBusy(() -> {
-            try {
-                GetSettingsResponse getSettingsResponse = cluster.client()
-                    .admin()
-                    .indices()
-                    .getSettings(new GetSettingsRequest().indices(targetIndex).indicesOptions(IndicesOptions.LENIENT_EXPAND_OPEN))
-                    .actionGet();
-                Settings indexSettings = getSettingsResponse.getIndexToSettings().get(targetIndex);
-                assertThat(indexSettings, is(notNullValue()));
-                assertThat(IndexMetadata.INDEX_DOWNSAMPLE_STATUS.get(indexSettings), is(IndexMetadata.DownsampleTaskStatus.SUCCESS));
-                assertEquals("5m", IndexMetadata.INDEX_DOWNSAMPLE_INTERVAL.get(indexSettings));
-            } catch (Exception e) {
-                throw new AssertionError(e);
-            }
-        }, 120, TimeUnit.SECONDS);
+        ensureDownsamplingStatus(targetIndex, IndexMetadata.DownsampleTaskStatus.SUCCESS, TimeValue.timeValueSeconds(120));
         ensureGreen(targetIndex);
+        logger.info("-> Relocation has finished");
+    }
+
+    private void ensureDownsamplingStatus(String downsampledIndex, IndexMetadata.DownsampleTaskStatus expectedStatus, TimeValue timeout) {
+        final var clusterService = internalCluster().getCurrentMasterNodeInstance(ClusterService.class);
+        final var listener = ClusterServiceUtils.addTemporaryStateListener(clusterService, clusterState -> {
+            final var indexMetadata = clusterState.metadata().index(downsampledIndex);
+            if (indexMetadata == null) {
+                return false;
+            }
+            var downsamplingStatus = INDEX_DOWNSAMPLE_STATUS.get(indexMetadata.getSettings());
+            if (expectedStatus == downsamplingStatus) {
+                logger.info("-> Downsampling status for index [{}] is [{}]", downsampledIndex, downsamplingStatus);
+                return true;
+            }
+            return false;
+        });
+        safeAwait(listener, timeout.millis(), TimeUnit.MILLISECONDS);
     }
 }