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From GitBox <...@apache.org>
Subject [GitHub] [zookeeper] jhuan31 commented on a change in pull request #856: ZOOKEEPER-3319: Add metrics for follower and observer
Date Tue, 19 Mar 2019 02:36:04 GMT
jhuan31 commented on a change in pull request #856: ZOOKEEPER-3319: Add metrics for follower
and observer
URL: https://github.com/apache/zookeeper/pull/856#discussion_r266711644
 
 

 ##########
 File path: zookeeper-server/src/main/java/org/apache/zookeeper/server/Request.java
 ##########
 @@ -305,4 +305,25 @@ public void setException(KeeperException e) {
     public KeeperException getException() {
         return e;
     }
+
+    public void logLatency(ServerMetrics metric, String key, long currentTime) {
+        if (hdr != null) {
+            /* Request header is created by leader. If there is clock drift
+             * latency might be negative. Headers use wall time, not
+             * CLOCK_MONOTONIC.
+             */
+            long latency = currentTime - hdr.getTime();
+            if (latency > 0) {
+                if (key != null) {
+                    metric.add(key, latency);
 
 Review comment:
   > ......Maybe it's better to overload logLatency(), one with key parameter, one w/o
parameter, instead of checking null. What do you think?
   > 
   > Yes it may be a good idea, can you try?
   
   Ok, I will refactor the code.

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