hachikuji commented on code in PR #13207:
URL: https://github.com/apache/kafka/pull/13207#discussion_r1099065953
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raft/src/main/java/org/apache/kafka/raft/internals/KafkaRaftMetrics.java:
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@@ -133,26 +131,27 @@ public KafkaRaftMetrics(Metrics metrics, String
metricGrpPrefix, QuorumState sta
"The average number of records appended per sec as the leader
of the raft quorum."),
new Rate(TimeUnit.SECONDS, new WindowedSum()));
- this.pollIdleSensor = metrics.sensor("poll-idle-ratio");
- this.pollIdleSensor.add(metrics.metricName("poll-idle-ratio-avg",
+ this.pollDurationSensor = metrics.sensor("poll-idle-ratio");
+ this.pollDurationSensor.add(metrics.metricName(
+ "poll-idle-ratio-avg",
metricGroupName,
- "The average fraction of time the client's poll() is idle as
opposed to waiting for the user code to process records."),
- new Avg());
+ "The ratio of time the Raft IO thread is idle as opposed to " +
+ "doing work (e.g. handling requests or replicating from
the leader)"
+ ),
+ new TimeRatio(1.0)
+ );
}
public void updatePollStart(long currentTimeMs) {
- if (pollEndMs.isPresent() && pollStartMs.isPresent()) {
- long pollTimeMs = Math.max(pollEndMs.getAsLong() -
pollStartMs.getAsLong(), 0L);
- long totalTimeMs = Math.max(currentTimeMs -
pollStartMs.getAsLong(), 1L);
- this.pollIdleSensor.record(pollTimeMs / (double) totalTimeMs,
currentTimeMs);
- }
-
this.pollStartMs = OptionalLong.of(currentTimeMs);
- this.pollEndMs = OptionalLong.empty();
}
public void updatePollEnd(long currentTimeMs) {
- this.pollEndMs = OptionalLong.of(currentTimeMs);
+ if (pollStartMs.isPresent()) {
+ long pollDurationMs = Math.max(currentTimeMs -
pollStartMs.getAsLong(), 0L);
Review Comment:
The clock we rely on is not monotonic, so it is possible to go backwards. It
seems better to handle this case gracefully with a default value than to crash
the IO thread.
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