CaoManhDat commented on a change in pull request #1470:
URL: https://github.com/apache/lucene-solr/pull/1470#discussion_r418416881



##########
File path: 
solr/solrj/src/java/org/apache/solr/client/solrj/impl/Http2SolrClient.java
##########
@@ -359,65 +366,95 @@ public void send(OutStream outStream, SolrRequest req, 
String collection) throws
     outStream.flush();
   }
 
-  public NamedList<Object> request(SolrRequest solrRequest,
-                                      String collection,
-                                      OnComplete onComplete) throws 
IOException, SolrServerException {
-    Request req = makeRequest(solrRequest, collection);
+  private static final Exception CANCELLED_EXCEPTION = new Exception();
+
+  public Cancellable asyncRequest(SolrRequest solrRequest, String collection, 
OnComplete onComplete) {
+    Request req;
+    try {
+      req = makeRequest(solrRequest, collection);
+    } catch (SolrServerException | IOException e) {
+      onComplete.onFailure(e);
+      return () -> {};

Review comment:
       +1




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