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https://issues.apache.org/jira/browse/SCB-370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16388831#comment-16388831
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ASF GitHub Bot commented on SCB-370:
------------------------------------
wujimin commented on a change in pull request #572: [SCB-370] Improve latency
and max precision
URL:
https://github.com/apache/incubator-servicecomb-java-chassis/pull/572#discussion_r172712666
##########
File path:
metrics/metrics-core/src/main/java/org/apache/servicecomb/metrics/core/HighPrecisionBasicTimer.java
##########
@@ -0,0 +1,101 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.servicecomb.metrics.core;
+
+import java.util.concurrent.TimeUnit;
+
+import org.apache.servicecomb.foundation.metrics.MetricsConst;
+
+import com.netflix.servo.monitor.BasicTimer;
+import com.netflix.servo.monitor.Monitor;
+import com.netflix.servo.monitor.MonitorConfig;
+import com.netflix.servo.tag.Tags;
+
+//latency and max should return by default millisecond unit value for easy use
+//because Timer is extends NumericMonitor<Long> so only can return Long result
value and lost precision (value after the decimal point will be remove)
+//warp BasicTimer, return custom Monitor<Double> for calculate double
millisecond value
+public class HighPrecisionBasicTimer extends BasicTimer {
+ private final MonitorForTimerValue timerValueMonitor;
+
+ private final MonitorForTimerMax timerMaxMonitor;
+
+ public MonitorForTimerValue getTimerValueMonitor() {
+ return timerValueMonitor;
+ }
+
+ public MonitorForTimerMax getTimerMaxMonitor() {
+ return timerMaxMonitor;
+ }
+
+ public HighPrecisionBasicTimer(MonitorConfig config) {
+ super(config, TimeUnit.NANOSECONDS);
+ this.timerValueMonitor = new MonitorForTimerValue(this);
+ this.timerMaxMonitor = new MonitorForTimerMax(this);
+ }
+
+ class MonitorForTimerValue implements Monitor<Double> {
+
+ private final BasicTimer timer;
+
+ public MonitorForTimerValue(BasicTimer timer) {
+ this.timer = timer;
+ }
+
+ @Override
+ public Double getValue() {
+ return this.getValue(0);
+ }
+
+ @Override
+ public Double getValue(int pollerIndex) {
+ //we need direct div for keep value after the decimal point
+ long nanoValue = timer.getValue();
+ return (double) nanoValue / (double) 1000000;
Review comment:
it seems that you confused input unit and output unit
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> Metrics timer (like latency) output precision must to nano level not milli
> level
> --------------------------------------------------------------------------------
>
> Key: SCB-370
> URL: https://issues.apache.org/jira/browse/SCB-370
> Project: Apache ServiceComb
> Issue Type: Sub-task
> Components: Java-Chassis
> Affects Versions: java-chassis-1.0.0-m1
> Reporter: yangyongzheng
> Assignee: yangyongzheng
> Priority: Major
> Fix For: java-chassis-1.0.0-m1
>
>
> current metrics latency default unit is MILLISECONDS and low than 1
> milliseconds like 0.5 will return 0,we need support higher accuracy and keep
> value after the decimal point
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