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From GitBox <...@apache.org>
Subject [GitHub] [zookeeper] eolivelli commented on a change in pull request #856: ZOOKEEPER-3319: Add metrics for follower and observer
Date Mon, 18 Mar 2019 23:06:41 GMT
eolivelli 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_r266676004
 
 

 ##########
 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:
   For the new API I have a new proposal which fits the Counter Set summaries.
   Please take a look here
   
   https://github.com/apache/zookeeper/pull/854/files
   
   This new patch covers perfectly existing model of your set of patches, it is 100% compatible

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