HDFS-15111. stopStandbyServices() should log which service state it is transitioning from. Contributed by Xieming Li.

(cherry picked from commit b182dd809cf42aed66806901631ad6062ca0820c)
(cherry picked from commit 7bfa123d583d94607600e38bd754e38fbafc64d2)

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java

@@ -95,6 +95,7 @@ import java.util.concurrent.atomic.AtomicLong;
 
 import static org.apache.hadoop.hdfs.server.namenode.FSDirStatAndListingOp.*;
 import static org.apache.hadoop.ha.HAServiceProtocol.HAServiceState.ACTIVE;
+import static org.apache.hadoop.ha.HAServiceProtocol.HAServiceState.STANDBY;
 import static org.apache.hadoop.ha.HAServiceProtocol.HAServiceState.OBSERVER;
 import org.apache.hadoop.hdfs.protocol.OpenFileEntry;
 import org.apache.hadoop.hdfs.server.protocol.SlowDiskReports;
@@ -1391,7 +1392,8 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
 
   /** Stop services required in standby state */
   void stopStandbyServices() throws IOException {
-    LOG.info("Stopping services started for standby state");
+    HAServiceState curState = getState() == OBSERVER? OBSERVER : STANDBY;
+    LOG.info("Stopping services started for {} state", curState);
     if (standbyCheckpointer != null) {
       standbyCheckpointer.stop();
     }