fix(restli): log aspect-not-found as a warning rather than as an error

metadata-service/restli-servlet-impl/src/main/java/com/linkedin/metadata/filter/RestliLoggingFilter.java

@@ -1,5 +1,6 @@
 package com.linkedin.metadata.filter;
 
+import com.linkedin.metadata.restli.NonExceptionHttpErrorResponse;
 import com.linkedin.restli.common.HttpMethod;
 import com.linkedin.restli.common.HttpStatus;
 import com.linkedin.restli.server.filter.Filter;
@@ -33,7 +34,9 @@ public CompletableFuture<Void> onError(
       final FilterRequestContext requestContext,
       final FilterResponseContext responseContext) {
     logResponse(requestContext, responseContext);
-    log.error("Rest.li error: ", th);
+    if (!(th instanceof NonExceptionHttpErrorResponse)) {
+      log.error("Rest.li error: ", th);
+    }
     return CompletableFuture.completedFuture(null);
   }
 

metadata-service/restli-servlet-impl/src/main/java/com/linkedin/metadata/resources/entity/AspectResource.java

@@ -13,15 +13,13 @@
 import com.codahale.metrics.MetricRegistry;
 import com.datahub.authentication.Authentication;
 import com.datahub.authentication.AuthenticationContext;
-import com.datahub.authorization.EntitySpec;
 import com.datahub.plugins.auth.authorization.Authorizer;
 import com.google.common.annotations.VisibleForTesting;
 import com.linkedin.aspect.GetTimeseriesAspectValuesResponse;
 import com.linkedin.common.AuditStamp;
 import com.linkedin.common.urn.Urn;
 import com.linkedin.metadata.aspect.EnvelopedAspectArray;
 import com.linkedin.metadata.aspect.VersionedAspect;
-import com.linkedin.metadata.authorization.Disjunctive;
 import com.linkedin.metadata.authorization.PoliciesConfig;
 import com.linkedin.metadata.entity.EntityService;
 import com.linkedin.metadata.entity.IngestResult;
@@ -153,9 +151,8 @@ public Task<AnyRecord> get(
           final VersionedAspect aspect =
               _entityService.getVersionedAspect(opContext, urn, aspectName, version);
           if (aspect == null) {
-            throw RestliUtil.resourceNotFoundException(
-                String.format(
-                    "Did not find urn: %s aspect: %s version: %s", urn, aspectName, version));
+              log.warn("Did not find urn: {} aspect: {} version: {}", urn, aspectName, version);
+              throw RestliUtil.nonExceptionResourceNotFound();
           }
           return new AnyRecord(aspect.data());
         },

metadata-utils/src/main/java/com/linkedin/metadata/restli/NonExceptionHttpErrorResponse.java

@@ -0,0 +1,47 @@
+package com.linkedin.metadata.restli;
+
+import com.linkedin.restli.common.HttpStatus;
+import com.linkedin.restli.server.RestLiServiceException;
+import com.linkedin.restli.server.errors.ServiceError;
+
+/**
+ * Captures an error <i>response</i> (e.g. 404-not-found) that is not to be regarded as an
+ * <i>exception</i> within the server. <br>
+ * <br>
+ * Restli apparently requires http-error-responses to be represented by {@link
+ * RestLiServiceException}; thus, we need this class to specify an error <i>response</i> that isn't
+ * really an <i>exception</i> (in the context of the server). <br>
+ * To highlight the unusual purpose of this exception, the name of this class is also deliberately
+ * unconventional (the class-name doesn't end with "Exception").
+ */
+public class NonExceptionHttpErrorResponse extends RestLiServiceException {
+
+  public NonExceptionHttpErrorResponse(HttpStatus status) {
+    super(status);
+  }
+
+  public NonExceptionHttpErrorResponse(HttpStatus status, String message) {
+    super(status, message);
+  }
+
+  public NonExceptionHttpErrorResponse(HttpStatus status, Throwable cause) {
+    super(status, cause);
+  }
+
+  public NonExceptionHttpErrorResponse(HttpStatus status, String message, Throwable cause) {
+    super(status, message, cause);
+  }
+
+  public NonExceptionHttpErrorResponse(
+      HttpStatus status, String message, Throwable cause, boolean writableStackTrace) {
+    super(status, message, cause, writableStackTrace);
+  }
+
+  public NonExceptionHttpErrorResponse(ServiceError serviceError) {
+    super(serviceError);
+  }
+
+  public NonExceptionHttpErrorResponse(ServiceError serviceError, Throwable cause) {
+    super(serviceError, cause);
+  }
+}

metadata-utils/src/main/java/com/linkedin/metadata/restli/RestliUtil.java

@@ -79,6 +79,11 @@ public static RestLiServiceException resourceNotFoundException() {
     return resourceNotFoundException(null);
   }
 
+  @Nonnull
+  public static RestLiServiceException nonExceptionResourceNotFound() {
+    return new NonExceptionHttpErrorResponse(HttpStatus.S_404_NOT_FOUND);
+  }
+
   @Nonnull
   public static RestLiServiceException resourceNotFoundException(@Nullable String message) {
     return new RestLiServiceException(HttpStatus.S_404_NOT_FOUND, message);