rishisankar commented on a change in pull request #1770:
URL: https://github.com/apache/lucene-solr/pull/1770#discussion_r474810544



##########
File path: 
solr/solrj/src/java/org/apache/solr/client/solrj/impl/BaseCloudSolrClient.java
##########
@@ -853,6 +858,18 @@ public RouteException(ErrorCode errorCode, 
NamedList<Throwable> throwables, Map<
 
   @Override
   public NamedList<Object> request(@SuppressWarnings({"rawtypes"})SolrRequest 
request, String collection) throws SolrServerException, IOException {
+      // synchronous requests should return an already completed future
+      return getNowOrException(makeRequest(request, collection, false));
+  }
+
+  CompletableFuture<NamedList<Object>> makeRequest(SolrRequest<?> request,
+                                                   String collection,
+                                                   boolean isAsyncRequest) 
throws SolrServerException, IOException {
+    if (isAsyncRequest && !(getLbClient() instanceof LBHttp2SolrClient)) {
+      log.warn("Asynchronous requests require HTTP/2 SolrJ client, defaulting 
to synchronous request.");
+      isAsyncRequest = false;

Review comment:
       The reason I included this check was because I later cast 
`(LBHttp2SolrClient)getLbClient()` (in sendRequest) - so even without this 
check, custom LB client implementations wouldn't work unless they subclass 
LBHttp2SolrClient. Perhaps another approach is to add an abstract asyncRequest 
method to LBSolrClient (which both `LBHttpSolrClient` and `LBHttp2SolrClient` 
extend) and just call that instead - and throw an 
`UnsupportedOperationException` in the case of the HTTP/1 client for now. What 
do you think?




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