Add remote download stats

Signed-off-by: Arpit Bandejiya <abandeji@amazon.com>

server/src/main/java/org/opensearch/cluster/coordination/CoordinationState.java

@@ -652,7 +652,7 @@ public interface PersistedState extends Closeable {
          * Returns the stats for the persistence layer for {@link CoordinationState}.
          * @return PersistedStateStats
          */
-        PersistedStateStats getStats();
+        PersistedStateStats getUploadStats();
 
         /**
          * Marks the last accepted cluster state as committed.

server/src/main/java/org/opensearch/cluster/coordination/Coordinator.java

@@ -896,11 +896,15 @@ public DiscoveryStats stats() {
         ClusterStateStats clusterStateStats = clusterManagerService.getClusterStateStats();
         ArrayList<PersistedStateStats> stats = new ArrayList<>();
         Stream.of(PersistedStateRegistry.PersistedStateType.values()).forEach(stateType -> {
-            if (persistedStateRegistry.getPersistedState(stateType) != null
-                && persistedStateRegistry.getPersistedState(stateType).getStats() != null) {
-                stats.add(persistedStateRegistry.getPersistedState(stateType).getStats());
+            if (persistedStateRegistry.getPersistedState(stateType) != null) {
+                if (persistedStateRegistry.getPersistedState(stateType).getUploadStats() != null) {
+                    stats.add(persistedStateRegistry.getPersistedState(stateType).getUploadStats());
+                }
             }
         });
+        if (coordinationState.get().isRemotePublicationEnabled()) {
+            stats.add(publicationHandler.getDownloadStats());
+        }
         clusterStateStats.setPersistenceStats(stats);
         return new DiscoveryStats(new PendingClusterStateStats(0, 0, 0), publicationHandler.stats(), clusterStateStats);
     }

server/src/main/java/org/opensearch/cluster/coordination/InMemoryPersistedState.java

@@ -66,7 +66,7 @@ public void setLastAcceptedState(ClusterState clusterState) {
     }
 
     @Override
-    public PersistedStateStats getStats() {
+    public PersistedStateStats getUploadStats() {
         return null;
     }
 

server/src/main/java/org/opensearch/cluster/coordination/PublicationTransportHandler.java

@@ -178,6 +178,10 @@ public PublishClusterStateStats stats() {
         );
     }
 
+    public PersistedStateStats getDownloadStats() {
+        return remoteClusterStateService.getDownloadStats();
+    }
+
     private PublishWithJoinResponse handleIncomingPublishRequest(BytesTransportRequest request) throws IOException {
         try (StreamInput in = CompressedStreamUtils.decompressBytes(request, namedWriteableRegistry)) {
             ClusterState incomingState;
@@ -231,69 +235,75 @@ private PublishWithJoinResponse handleIncomingPublishRequest(BytesTransportReque
     }
 
     // package private for testing
-    PublishWithJoinResponse handleIncomingRemotePublishRequest(RemotePublishRequest request) throws IOException {
-        if (transportService.getLocalNode().equals(request.getSourceNode())) {
-            return acceptRemoteStateOnLocalNode(request);
-        }
-        // TODO Make cluster state download non-blocking: https://github.com/opensearch-project/OpenSearch/issues/14102
-        ClusterMetadataManifest manifest = remoteClusterStateService.getClusterMetadataManifestByFileName(
-            request.getClusterUUID(),
-            request.getManifestFile()
-        );
-        if (manifest == null) {
-            throw new IllegalStateException("Publication failed as manifest was not found for " + request);
-        }
-        boolean applyFullState = false;
-        final ClusterState lastSeen = lastSeenClusterState.get();
-        if (lastSeen == null) {
-            logger.debug(() -> "Diff cannot be applied as there is no last cluster state");
-            applyFullState = true;
-        } else if (manifest.getDiffManifest() == null) {
-            logger.trace(() -> "There is no diff in the manifest");
-            applyFullState = true;
-        } else if (manifest.getDiffManifest().getFromStateUUID().equals(lastSeen.stateUUID()) == false) {
-            logger.debug(() -> "Last cluster state not compatible with the diff");
-            applyFullState = true;
-        }
-
-        if (applyFullState == true) {
-            logger.debug(
-                () -> new ParameterizedMessage(
-                    "Downloading full cluster state for term {}, version {}, stateUUID {}",
-                    manifest.getClusterTerm(),
-                    manifest.getStateVersion(),
-                    manifest.getStateUUID()
-                )
-            );
-            ClusterState clusterState = remoteClusterStateService.getClusterStateForManifest(
-                request.getClusterName(),
-                manifest,
-                transportService.getLocalNode().getId(),
-                true
-            );
-            fullClusterStateReceivedCount.incrementAndGet();
-            final PublishWithJoinResponse response = acceptState(clusterState);
-            lastSeenClusterState.set(clusterState);
-            return response;
-        } else {
-            logger.debug(
-                () -> new ParameterizedMessage(
-                    "Downloading diff cluster state for term {}, version {}, previousUUID {}, current UUID {}",
-                    manifest.getClusterTerm(),
-                    manifest.getStateVersion(),
-                    manifest.getDiffManifest().getFromStateUUID(),
-                    manifest.getStateUUID()
-                )
-            );
-            ClusterState clusterState = remoteClusterStateService.getClusterStateUsingDiff(
-                manifest,
-                lastSeen,
-                transportService.getLocalNode().getId()
+    PublishWithJoinResponse handleIncomingRemotePublishRequest(RemotePublishRequest request) throws IOException, RuntimeException {
+        try {
+            if (transportService.getLocalNode().equals(request.getSourceNode())) {
+                return acceptRemoteStateOnLocalNode(request);
+            }
+            // TODO Make cluster state download non-blocking: https://github.com/opensearch-project/OpenSearch/issues/14102
+            ClusterMetadataManifest manifest = remoteClusterStateService.getClusterMetadataManifestByFileName(
+                request.getClusterUUID(),
+                request.getManifestFile()
             );
-            compatibleClusterStateDiffReceivedCount.incrementAndGet();
-            final PublishWithJoinResponse response = acceptState(clusterState);
-            lastSeenClusterState.compareAndSet(lastSeen, clusterState);
-            return response;
+            if (manifest == null) {
+                throw new IllegalStateException("Publication failed as manifest was not found for " + request);
+            }
+            boolean applyFullState = false;
+            final ClusterState lastSeen = lastSeenClusterState.get();
+            if (lastSeen == null) {
+                logger.debug(() -> "Diff cannot be applied as there is no last cluster state");
+                applyFullState = true;
+            } else if (manifest.getDiffManifest() == null) {
+                logger.debug(() -> "There is no diff in the manifest");
+                applyFullState = true;
+            } else if (manifest.getDiffManifest().getFromStateUUID().equals(lastSeen.stateUUID()) == false) {
+                logger.debug(() -> "Last cluster state not compatible with the diff");
+                applyFullState = true;
+            }
+
+            if (applyFullState == true) {
+                logger.debug(
+                    () -> new ParameterizedMessage(
+                        "Downloading full cluster state for term {}, version {}, stateUUID {}",
+                        manifest.getClusterTerm(),
+                        manifest.getStateVersion(),
+                        manifest.getStateUUID()
+                    )
+                );
+                ClusterState clusterState = remoteClusterStateService.getClusterStateForManifest(
+                    request.getClusterName(),
+                    manifest,
+                    transportService.getLocalNode().getId(),
+                    true
+                );
+                fullClusterStateReceivedCount.incrementAndGet();
+                final PublishWithJoinResponse response = acceptState(clusterState);
+                lastSeenClusterState.set(clusterState);
+                return response;
+            } else {
+                logger.debug(
+                    () -> new ParameterizedMessage(
+                        "Downloading diff cluster state for term {}, version {}, previousUUID {}, current UUID {}",
+                        manifest.getClusterTerm(),
+                        manifest.getStateVersion(),
+                        manifest.getDiffManifest().getFromStateUUID(),
+                        manifest.getStateUUID()
+                    )
+                );
+                ClusterState clusterState = remoteClusterStateService.getClusterStateUsingDiff(
+                    manifest,
+                    lastSeen,
+                    transportService.getLocalNode().getId()
+                );
+                compatibleClusterStateDiffReceivedCount.incrementAndGet();
+                final PublishWithJoinResponse response = acceptState(clusterState);
+                lastSeenClusterState.compareAndSet(lastSeen, clusterState);
+                return response;
+            }
+        } catch (Exception e) {
+            remoteClusterStateService.readMetadataFailed();
+            if (e instanceof IOException) throw new IOException("IOException in reading remote cluster state", e);
+            throw new RuntimeException("Runtime exception in reading remote cluster state", e);
         }
     }
 

server/src/main/java/org/opensearch/gateway/GatewayMetaState.java

@@ -618,7 +618,7 @@ public void setLastAcceptedState(ClusterState clusterState) {
         }
 
         @Override
-        public PersistedStateStats getStats() {
+        public PersistedStateStats getUploadStats() {
             // Note: These stats are not published yet, will come in future
             return null;
         }
@@ -745,8 +745,8 @@ assert verifyManifestAndClusterState(manifestDetails.getClusterMetadataManifest(
         }
 
         @Override
-        public PersistedStateStats getStats() {
-            return remoteClusterStateService.getStats();
+        public PersistedStateStats getUploadStats() {
+            return remoteClusterStateService.getUploadStats();
         }
 
         private boolean verifyManifestAndClusterState(ClusterMetadataManifest manifest, ClusterState clusterState) {

server/src/main/java/org/opensearch/gateway/remote/RemoteClusterStateService.java

@@ -18,6 +18,7 @@
 import org.opensearch.cluster.DiffableUtils;
 import org.opensearch.cluster.block.ClusterBlocks;
 import org.opensearch.cluster.coordination.CoordinationMetadata;
+import org.opensearch.cluster.coordination.PersistedStateStats;
 import org.opensearch.cluster.metadata.DiffableStringMap;
 import org.opensearch.cluster.metadata.IndexMetadata;
 import org.opensearch.cluster.metadata.Metadata;
@@ -258,8 +259,8 @@ public RemoteClusterStateManifestInfo writeFullMetadata(ClusterState clusterStat
         );
 
         final long durationMillis = TimeValue.nsecToMSec(relativeTimeNanosSupplier.getAsLong() - startTimeNanos);
-        remoteStateStats.stateSucceeded();
-        remoteStateStats.stateTook(durationMillis);
+        remoteStateStats.stateUploadSucceeded();
+        remoteStateStats.stateUploadTook(durationMillis);
         if (durationMillis >= slowWriteLoggingThreshold.getMillis()) {
             logger.warn(
                 "writing cluster state took [{}ms] which is above the warn threshold of [{}]; "
@@ -450,8 +451,8 @@ public RemoteClusterStateManifestInfo writeIncrementalMetadata(
         );
 
         final long durationMillis = TimeValue.nsecToMSec(relativeTimeNanosSupplier.getAsLong() - startTimeNanos);
-        remoteStateStats.stateSucceeded();
-        remoteStateStats.stateTook(durationMillis);
+        remoteStateStats.stateUploadSucceeded();
+        remoteStateStats.stateUploadTook(durationMillis);
         ParameterizedMessage clusterStateUploadTimeMessage = new ParameterizedMessage(
             CLUSTER_STATE_UPLOAD_TIME_LOG_STRING,
             manifestDetails.getClusterMetadataManifest().getStateVersion(),
@@ -1315,8 +1316,10 @@ public ClusterState getClusterStateForManifest(
         String localNodeId,
         boolean includeEphemeral
     ) throws IOException {
+        final ClusterState clusterState;
+        final long startTimeNanos = relativeTimeNanosSupplier.getAsLong();
         if (manifest.onOrAfterCodecVersion(CODEC_V2)) {
-            return readClusterStateInParallel(
+            clusterState = readClusterStateInParallel(
                 ClusterState.builder(new ClusterName(clusterName)).build(),
                 manifest,
                 manifest.getClusterUUID(),
@@ -1336,7 +1339,7 @@ public ClusterState getClusterStateForManifest(
                 includeEphemeral
             );
         } else {
-            ClusterState clusterState = readClusterStateInParallel(
+            ClusterState state = readClusterStateInParallel(
                 ClusterState.builder(new ClusterName(clusterName)).build(),
                 manifest,
                 manifest.getClusterUUID(),
@@ -1357,15 +1360,20 @@ public ClusterState getClusterStateForManifest(
                 false
             );
             Metadata.Builder mb = Metadata.builder(remoteGlobalMetadataManager.getGlobalMetadata(manifest.getClusterUUID(), manifest));
-            mb.indices(clusterState.metadata().indices());
-            return ClusterState.builder(clusterState).metadata(mb).build();
+            mb.indices(state.metadata().indices());
+            clusterState = ClusterState.builder(state).metadata(mb).build();
         }
+        final long durationMillis = TimeValue.nsecToMSec(relativeTimeNanosSupplier.getAsLong() - startTimeNanos);
+        remoteStateStats.stateDownloadSucceeded();
+        remoteStateStats.stateDownloadTook(durationMillis);
 
+        return clusterState;
     }
 
     public ClusterState getClusterStateUsingDiff(ClusterMetadataManifest manifest, ClusterState previousState, String localNodeId)
         throws IOException {
         assert manifest.getDiffManifest() != null : "Diff manifest null which is required for downloading cluster state";
+        final long startTimeNanos = relativeTimeNanosSupplier.getAsLong();
         ClusterStateDiffManifest diff = manifest.getDiffManifest();
         List<UploadedIndexMetadata> updatedIndices = diff.getIndicesUpdated().stream().map(idx -> {
             Optional<UploadedIndexMetadata> uploadedIndexMetadataOptional = manifest.getIndices()
@@ -1441,11 +1449,17 @@ public ClusterState getClusterStateUsingDiff(ClusterMetadataManifest manifest, C
             indexRoutingTables.remove(indexName);
         }
 
-        return clusterStateBuilder.stateUUID(manifest.getStateUUID())
+        ClusterState clusterState = clusterStateBuilder.stateUUID(manifest.getStateUUID())
             .version(manifest.getStateVersion())
             .metadata(metadataBuilder)
             .routingTable(new RoutingTable(manifest.getRoutingTableVersion(), indexRoutingTables))
             .build();
+
+        final long durationMillis = TimeValue.nsecToMSec(relativeTimeNanosSupplier.getAsLong() - startTimeNanos);
+        remoteStateStats.stateDownloadSucceeded();
+        remoteStateStats.stateDownloadTook(durationMillis);
+
+        return clusterState;
     }
 
     /**
@@ -1641,10 +1655,18 @@ void setRemoteClusterStateAttributesManager(RemoteClusterStateAttributesManager
     }
 
     public void writeMetadataFailed() {
-        getStats().stateFailed();
+        remoteStateStats.stateUploadFailed();
+    }
+
+    public void readMetadataFailed() {
+        remoteStateStats.stateDownloadFailed();
+    }
+
+    public PersistedStateStats getUploadStats() {
+        return remoteStateStats.getUploadStats();
     }
 
-    public RemotePersistenceStats getStats() {
-        return remoteStateStats;
+    public PersistedStateStats getDownloadStats() {
+        return remoteStateStats.getDownloadStats();
     }
 }

server/src/main/java/org/opensearch/gateway/remote/RemoteDownloadStats.java

@@ -0,0 +1,19 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.gateway.remote;
+
+import org.opensearch.cluster.coordination.PersistedStateStats;
+
+public class RemoteDownloadStats extends PersistedStateStats {
+    static final String REMOTE_DOWNLOAD = "remote_download";
+
+    public RemoteDownloadStats() {
+        super(REMOTE_DOWNLOAD);
+    }
+}