HDFS-13092. Reduce verbosity for ThrottledAsyncChecker#schedule. Contributed by Mukul Kumar Singh.

(cherry picked from commit 3ce2190b581526ad2d49e8c3a47be1547037310c)

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/checker/ThrottledAsyncChecker.java

@@ -119,7 +119,6 @@ public class ThrottledAsyncChecker<K, V> implements AsyncChecker<K, V> {
   @Override
   public Optional<ListenableFuture<V>> schedule(Checkable<K, V> target,
                                                 K context) {
-    LOG.info("Scheduling a check for {}", target);
     if (checksInProgress.containsKey(target)) {
       return Optional.absent();
     }
@@ -135,6 +134,7 @@ public class ThrottledAsyncChecker<K, V> implements AsyncChecker<K, V> {
       }
     }
 
+    LOG.info("Scheduling a check for {}", target);
     final ListenableFuture<V> lfWithoutTimeout = executorService.submit(
         new Callable<V>() {
           @Override