HADOOP-19361. RPC DeferredMetrics bugfix. (#7220). Contributed by hfutatzhanghb.

Reviewed-by: Jian Zhang <keepromise@apache.org>

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/ProtobufRpcEngine.java

@@ -214,7 +214,7 @@ public class ProtobufRpcEngine implements RpcEngine {
         throws ServiceException {
       long startTime = 0;
       if (LOG.isDebugEnabled()) {
-        startTime = Time.now();
+        startTime = Time.monotonicNow();
       }
       
       if (args.length != 2) { // RpcController + Message
@@ -267,7 +267,7 @@ public class ProtobufRpcEngine implements RpcEngine {
       }
 
       if (LOG.isDebugEnabled()) {
-        long callTime = Time.now() - startTime;
+        long callTime = Time.monotonicNow() - startTime;
         LOG.debug("Call: " + method.getName() + " took " + callTime + "ms");
       }
       

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/ProtobufRpcEngine2.java

@@ -223,7 +223,7 @@ public class ProtobufRpcEngine2 implements RpcEngine {
         throws ServiceException {
       long startTime = 0;
       if (LOG.isDebugEnabled()) {
-        startTime = Time.now();
+        startTime = Time.monotonicNow();
       }
 
       if (args.length != 2) { // RpcController + Message
@@ -278,7 +278,7 @@ public class ProtobufRpcEngine2 implements RpcEngine {
       }
 
       if (LOG.isDebugEnabled()) {
-        long callTime = Time.now() - startTime;
+        long callTime = Time.monotonicNow() - startTime;
         LOG.debug("Call: " + method.getName() + " took " + callTime + "ms");
       }