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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.jdisc.state;
import com.fasterxml.jackson.databind.JsonNode;
import com.yahoo.component.Vtag;
import com.yahoo.jdisc.Metric;
import com.yahoo.vespa.defaults.Defaults;
import org.junit.Test;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.TreeMap;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
/**
* @author Simon Thoresen Hult
*/
public class StateHandlerTest extends StateHandlerTestBase {
@Test
public void testReportPriorToFirstSnapshot() throws Exception {
metric.add("foo", 1, null);
metric.set("bar", 4, null);
JsonNode json = requestAsJson("http://localhost/state/v1/all");
assertEquals(json.toString(), "up", json.get("status").get("code").asText());
assertFalse(json.toString(), json.get("metrics").has("values"));
}
@Test
public void testReportIncludesMetricsAfterSnapshot() throws Exception {
metric.add("foo", 1, null);
metric.set("bar", 4, null);
advanceToNextSnapshot();
JsonNode json1 = requestAsJson("http://localhost/state/v1/metrics");
assertEquals(json1.toString(), "up", json1.get("status").get("code").asText());
assertEquals(json1.toString(), 2, json1.get("metrics").get("values").size());
metric.add("fuz", 1, metric.createContext(new HashMap<>(0)));
advanceToNextSnapshot();
JsonNode json2 = requestAsJson("http://localhost/state/v1/metrics");
assertEquals(json2.toString(), "up", json2.get("status").get("code").asText());
assertEquals(json2.toString(), 3, json2.get("metrics").get("values").size());
}
/**
* Tests that we restart an metric when it changes type from gauge to counter or back.
* This may happen in practice on config reloads.
*/
@Test
public void testMetricTypeChangeIsAllowed() {
String metricName = "myMetric";
Metric.Context metricContext = null;
{
// Add a count metric
metric.add(metricName, 1, metricContext);
metric.add(metricName, 2, metricContext);
// Change it to a gauge metric
metric.set(metricName, 9, metricContext);
advanceToNextSnapshot();
MetricValue resultingMetric = monitor.snapshot().iterator().next().getValue().get(metricName);
assertEquals(GaugeMetric.class, resultingMetric.getClass());
assertEquals("Value was reset and produces the last gauge value",
9.0, ((GaugeMetric) resultingMetric).getLast(), 0.000001);
}
{
// Add a gauge metric
metric.set(metricName, 9, metricContext);
// Change it to a count metric
metric.add(metricName, 1, metricContext);
metric.add(metricName, 2, metricContext);
advanceToNextSnapshot();
MetricValue resultingMetric = monitor.snapshot().iterator().next().getValue().get(metricName);
assertEquals(CountMetric.class, resultingMetric.getClass());
assertEquals("Value was reset, and changed to add semantics giving 1+2",
3, ((CountMetric) resultingMetric).getCount());
}
}
@Test
public void testAverageAggregationOfValues() throws Exception {
metric.set("bar", 4, null);
metric.set("bar", 5, null);
metric.set("bar", 7, null);
metric.set("bar", 2, null);
advanceToNextSnapshot();
JsonNode json = requestAsJson("http://localhost/state/v1/all");
assertEquals(json.toString(), "up", json.get("status").get("code").asText());
assertEquals(json.toString(), 1, json.get("metrics").get("values").size());
assertEquals(json.toString(), 4.5,
json.get("metrics").get("values").get(0).get("values").get("average").asDouble(), 0.001);
}
@Test
public void testSumAggregationOfCounts() throws Exception {
metric.add("foo", 1, null);
metric.add("foo", 1, null);
metric.add("foo", 2, null);
metric.add("foo", 1, null);
advanceToNextSnapshot();
JsonNode json = requestAsJson("http://localhost/state/v1/all");
assertEquals(json.toString(), "up", json.get("status").get("code").asText());
assertEquals(json.toString(), 1, json.get("metrics").get("values").size());
assertEquals(json.toString(), 5,
json.get("metrics").get("values").get(0).get("values").get("count").asDouble(), 0.001);
}
@Test
public void testReadabilityOfJsonReport() throws Exception {
metric.add("foo", 1, null);
advanceToNextSnapshot();
assertEquals("{\n" +
" \"metrics\": {\n" +
" \"snapshot\": {\n" +
" \"from\": 0,\n" +
" \"to\": 300\n" +
" },\n" +
" \"values\": [{\n" +
" \"name\": \"foo\",\n" +
" \"values\": {\n" +
" \"count\": 1,\n" +
" \"rate\": 0.0033333333333333335\n" +
" }\n" +
" }]\n" +
" },\n" +
" \"status\": {\"code\": \"up\"},\n" +
" \"time\": 300000\n" +
"}",
requestAsString("http://localhost/state/v1/all"));
Metric.Context ctx = metric.createContext(Collections.singletonMap("component", "test"));
metric.set("bar", 2, ctx);
metric.set("bar", 3, ctx);
metric.set("bar", 4, ctx);
metric.set("bar", 5, ctx);
advanceToNextSnapshot();
assertEquals("{\n" +
" \"metrics\": {\n" +
" \"snapshot\": {\n" +
" \"from\": 300,\n" +
" \"to\": 600\n" +
" },\n" +
" \"values\": [\n" +
" {\n" +
" \"name\": \"foo\",\n" +
" \"values\": {\n" +
" \"count\": 0,\n" +
" \"rate\": 0\n" +
" }\n" +
" },\n" +
" {\n" +
" \"dimensions\": {\"component\": \"test\"},\n" +
" \"name\": \"bar\",\n" +
" \"values\": {\n" +
" \"average\": 3.5,\n" +
" \"count\": 4,\n" +
" \"last\": 5,\n" +
" \"max\": 5,\n" +
" \"min\": 2,\n" +
" \"rate\": 0.013333333333333334,\n" +
" \"sum\": 14\n" +
" }\n" +
" }\n" +
" ]\n" +
" },\n" +
" \"status\": {\"code\": \"up\"},\n" +
" \"time\": 600000\n" +
"}",
requestAsString("http://localhost/state/v1/all"));
}
@Test
public void testNotAggregatingCountsBeyondSnapshots() throws Exception {
metric.add("foo", 1, null);
metric.add("foo", 1, null);
advanceToNextSnapshot();
metric.add("foo", 2, null);
metric.add("foo", 1, null);
advanceToNextSnapshot();
JsonNode json = requestAsJson("http://localhost/state/v1/all");
assertEquals(json.toString(), "up", json.get("status").get("code").asText());
assertEquals(json.toString(), 1, json.get("metrics").get("values").size());
assertEquals(json.toString(), 3,
json.get("metrics").get("values").get(0).get("values").get("count").asDouble(), 0.001);
}
@Test
public void testSnapshottingTimes() throws Exception {
metric.add("foo", 1, null);
metric.set("bar", 3, null);
// At this time we should not have done any snapshotting
{
JsonNode json = requestAsJson("http://localhost/state/v1/all");
assertFalse(json.toString(), json.get("metrics").has("snapshot"));
}
// At this time first snapshot should have been generated
advanceToNextSnapshot();
{
JsonNode json = requestAsJson("http://localhost/state/v1/all");
assertTrue(json.toString(), json.get("metrics").has("snapshot"));
assertEquals(0.0, json.get("metrics").get("snapshot").get("from").asDouble(), 0.00001);
assertEquals(300.0, json.get("metrics").get("snapshot").get("to").asDouble(), 0.00001);
}
// No new snapshot
{
JsonNode json = requestAsJson("http://localhost/state/v1/all");
assertTrue(json.toString(), json.get("metrics").has("snapshot"));
assertEquals(0.0, json.get("metrics").get("snapshot").get("from").asDouble(), 0.00001);
assertEquals(300.0, json.get("metrics").get("snapshot").get("to").asDouble(), 0.00001);
}
// A new snapshot
advanceToNextSnapshot();
{
JsonNode json = requestAsJson("http://localhost/state/v1/all");
assertTrue(json.toString(), json.get("metrics").has("snapshot"));
assertEquals(300.0, json.get("metrics").get("snapshot").get("from").asDouble(), 0.00001);
assertEquals(600.0, json.get("metrics").get("snapshot").get("to").asDouble(), 0.00001);
}
}
@Test
public void testFreshStartOfValuesBeyondSnapshot() throws Exception {
metric.set("bar", 4, null);
metric.set("bar", 5, null);
advanceToNextSnapshot();
metric.set("bar", 4, null);
metric.set("bar", 2, null);
advanceToNextSnapshot();
JsonNode json = requestAsJson("http://localhost/state/v1/all");
assertEquals(json.toString(), "up", json.get("status").get("code").asText());
assertEquals(json.toString(), 1, json.get("metrics").get("values").size());
assertEquals(json.toString(), 3,
json.get("metrics").get("values").get(0).get("values").get("average").asDouble(), 0.001);
}
@Test
public void snapshotsPreserveLastGaugeValue() throws Exception {
metric.set("bar", 4, null);
advanceToNextSnapshot();
advanceToNextSnapshot();
JsonNode json = requestAsJson("http://localhost/state/v1/all");
JsonNode metricValues = getFirstMetricValueNode(json);
assertEquals(json.toString(), 4, metricValues.get("last").asDouble(), 0.001);
// Use 'last' as avg/min/max when none has been set explicitly during snapshot period
assertEquals(json.toString(), 4, metricValues.get("average").asDouble(), 0.001);
assertEquals(json.toString(), 4, metricValues.get("min").asDouble(), 0.001);
assertEquals(json.toString(), 4, metricValues.get("max").asDouble(), 0.001);
// Count is tracked per period.
assertEquals(json.toString(), 0, metricValues.get("count").asInt());
}
private JsonNode getFirstMetricValueNode(JsonNode root) {
assertEquals(root.toString(), 1, root.get("metrics").get("values").size());
JsonNode metricValues = root.get("metrics").get("values").get(0).get("values");
assertTrue(root.toString(), metricValues.has("last"));
return metricValues;
}
@Test
public void gaugeSnapshotsTracksCountMinMaxAvgPerPeriod() throws Exception {
metric.set("bar", 10000, null); // Ensure any cross-snapshot noise is visible
advanceToNextSnapshot();
metric.set("bar", 20, null);
metric.set("bar", 40, null);
advanceToNextSnapshot();
JsonNode json = requestAsJson("http://localhost/state/v1/all");
JsonNode metricValues = getFirstMetricValueNode(json);
assertEquals(json.toString(), 40, metricValues.get("last").asDouble(), 0.001);
// Last snapshot had explicit values set
assertEquals(json.toString(), 30, metricValues.get("average").asDouble(), 0.001);
assertEquals(json.toString(), 20, metricValues.get("min").asDouble(), 0.001);
assertEquals(json.toString(), 40, metricValues.get("max").asDouble(), 0.001);
assertEquals(json.toString(), 2, metricValues.get("count").asInt());
}
@Test
public void testHealthAggregation() throws Exception {
Map<String, String> dimensions1 = new TreeMap<>();
dimensions1.put("port", String.valueOf(Defaults.getDefaults().vespaWebServicePort()));
Metric.Context context1 = metric.createContext(dimensions1);
Map<String, String> dimensions2 = new TreeMap<>();
dimensions2.put("port", "80");
Metric.Context context2 = metric.createContext(dimensions2);
metric.add("serverNumSuccessfulResponses", 4, context1);
metric.add("serverNumSuccessfulResponses", 2, context2);
metric.set("serverTotalSuccessfulResponseLatency", 20, context1);
metric.set("serverTotalSuccessfulResponseLatency", 40, context2);
metric.add("random", 3, context1);
advanceToNextSnapshot();
JsonNode json = requestAsJson("http://localhost/state/v1/health");
assertEquals(json.toString(), "up", json.get("status").get("code").asText());
assertEquals(json.toString(), 2, json.get("metrics").get("values").size());
assertEquals(json.toString(), "requestsPerSecond",
json.get("metrics").get("values").get(0).get("name").asText());
assertEquals(json.toString(), 6,
json.get("metrics").get("values").get(0).get("values").get("count").asDouble(), 0.001);
assertEquals(json.toString(), "latencySeconds",
json.get("metrics").get("values").get(1).get("name").asText());
assertEquals(json.toString(), 0.03,
json.get("metrics").get("values").get(1).get("values").get("average").asDouble(), 0.001);
}
@Test
public void testStateConfig() throws Exception {
JsonNode root = requestAsJson("http://localhost/state/v1/config");
JsonNode config = root.get("config");
JsonNode container = config.get("container");
assertEquals(META_GENERATION, container.get("generation").asLong());
}
@Test
public void testStateVersion() throws Exception {
JsonNode root = requestAsJson("http://localhost/state/v1/version");
JsonNode version = root.get("version");
assertEquals(Vtag.currentVersion.toString(), version.asText());
}
}
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