HDFS-9911. TestDataNodeLifeline Fails intermittently. Contributed by Yiqun Lin

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

@@ -1068,7 +1068,7 @@ class BPServiceActor implements Runnable {
     volatile long nextHeartbeatTime = monotonicNow();
 
     @VisibleForTesting
-    volatile long nextLifelineTime = monotonicNow();
+    volatile long nextLifelineTime;
 
     @VisibleForTesting
     volatile long lastBlockReportTime = monotonicNow();
@@ -1091,6 +1091,7 @@ class BPServiceActor implements Runnable {
       this.heartbeatIntervalMs = heartbeatIntervalMs;
       this.lifelineIntervalMs = lifelineIntervalMs;
       this.blockReportIntervalMs = blockReportIntervalMs;
+      scheduleNextLifeline(nextHeartbeatTime);
     }
 
     // This is useful to make sure NN gets Heartbeat before Blockreport