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_r266641485
##########
File path:
zookeeper-server/src/main/java/org/apache/zookeeper/server/Request.java
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@@ -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:
If the metric is of type Set, then we need the key. If not, then key should
be null. For example, ACK_LATENCY is of type AvgMinMaxPercentileCounterSet,
meaning we record the latency for each server and the server_id is the key.
Maybe it's better to overload logLatency(), one with key parameter, one w/o
parameter, instead of checking null. What do you think?
Also I have been thinking how to represent Set metrics using the new APIs.
My intuition is that context should be the answer but we probably need a couple
more APIs.
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