Apache9 commented on code in PR #6450:
URL: https://github.com/apache/hbase/pull/6450#discussion_r1836818467


##########
hbase-asyncfs/src/main/java/org/apache/hadoop/hbase/io/asyncfs/FanOutOneBlockAsyncDFSOutput.java:
##########
@@ -354,10 +364,24 @@ private void setupReceiver(int timeoutMs) {
     }
   }
 
+  private static final String DUMMY_DFS_OUTPUT_STREAM_CLASS =
+    "org.apache.hadoop.hdfs.DummyDFSOutputStream";
+
+  private DFSOutputStream tryCreateDummyDFSOutputStream(EnumSet<CreateFlag> 
createFlags) {
+    try {
+      return (DFSOutputStream) 
Class.forName(DUMMY_DFS_OUTPUT_STREAM_CLASS).getConstructors()[0]
+        .newInstance(this, client, src, stat, createFlags, summer);
+    } catch (Exception e) {
+      LOG.debug("can not instantiate DummyDFSOutputStream, should be hadoop 
2.x", e);

Review Comment:
   We could have a try to safe the constructor so we do not need to do this 
everytime.



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