Merge branch 'HDFS-17588' of https://github.com/fuchaohong/hadoop into HDFS-17588

Author: fuchaohong

hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/router/TestObserverWithRouter.java

@@ -907,8 +907,7 @@ public void testAutoMsyncDefault(ConfigSetting configSetting) throws Exception {
         break;
       case USE_ROUTER_OBSERVER_READ_PROXY_PROVIDER:
       case USE_ROUTER_OBSERVER_READ_CONFIGURED_FAILOVER_PROXY_PROVIDER:
-        // An msync is sent to each active namenode for each read.
-        // Total msyncs will be (1 * num_of_nameservices).
+        // An msync is sent to each active namenode.
         assertEquals("Msyncs sent to the active namenodes",
             NUM_NAMESERVICES * 1, rpcCountForActive);
         // All reads should be sent of the observer.