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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.documentapi.messagebus.protocol;
import com.yahoo.jrt.slobrok.api.Mirror;
import org.junit.Test;
import java.util.Arrays;
import java.util.List;
import java.util.Random;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
/**
* @author Simon Thoresen Hult
*/
public class LoadBalancerTestCase {
@Test
public void requireThatParseExceptionIsReadable() {
assertIllegalArgument("foo", "bar", "Expected recipient on the form 'foo/x/[y.]number/z', got 'bar'.");
assertIllegalArgument("foo", "foobar", "Expected recipient on the form 'foo/x/[y.]number/z', got 'foobar'.");
assertIllegalArgument("foo", "foo", "Expected recipient on the form 'foo/x/[y.]number/z', got 'foo'.");
assertIllegalArgument("foo", "foo/", "Expected recipient on the form 'foo/x/[y.]number/z', got 'foo/'.");
assertIllegalArgument("foo", "foo/0", "Expected recipient on the form 'foo/x/[y.]number/z', got 'foo/0'.");
assertIllegalArgument("foo", "foo/0.", "Expected recipient on the form 'foo/x/[y.]number/z', got 'foo/0.'.");
assertIllegalArgument("foo", "foo/0.bar", "Expected recipient on the form 'foo/x/[y.]number/z', got 'foo/0.bar'.");
assertIllegalArgument("foo", "foo/bar", "Expected recipient on the form 'foo/x/[y.]number/z', got 'foo/bar'.");
assertIllegalArgument("foo", "foo/bar.", "Expected recipient on the form 'foo/x/[y.]number/z', got 'foo/bar.'.");
assertIllegalArgument("foo", "foo/bar.0", "Expected recipient on the form 'foo/x/[y.]number/z', got 'foo/bar.0'.");
}
private static void assertIllegalArgument(String clusterName, String recipient, String expectedMessage) {
LoadBalancer policy = new AdaptiveLoadBalancer(clusterName);
try {
fail("Expected exception, got index " + policy.getIndex(recipient) + ".");
} catch (IllegalArgumentException e) {
assertEquals(expectedMessage, e.getMessage());
}
}
@Test
public void testLoadBalancerCreation() {
LoadBalancerPolicy lbp = new LoadBalancerPolicy("cluster=docproc/cluster.mobile.indexing;session=chain.mobile.indexing");
assertTrue(lbp.getLoadBalancer() instanceof AdaptiveLoadBalancer);
lbp = new LoadBalancerPolicy("cluster=docproc/cluster.mobile.indexing;session=chain.mobile.indexing;type=legacy");
assertTrue(lbp.getLoadBalancer() instanceof AdaptiveLoadBalancer);
lbp = new LoadBalancerPolicy("cluster=docproc/cluster.mobile.indexing;session=chain.mobile.indexing;type=adaptive");
assertTrue(lbp.getLoadBalancer() instanceof AdaptiveLoadBalancer);
}
@Test
public void testAdaptiveLoadBalancer() {
LoadBalancer lb = new AdaptiveLoadBalancer("foo", new Random(1));
List<Mirror.Entry> entries = Arrays.asList(new Mirror.Entry("foo/0/default", "tcp/bar:1"),
new Mirror.Entry("foo/1/default", "tcp/bar:2"),
new Mirror.Entry("foo/2/default", "tcp/bar:3"));
List<LoadBalancer.NodeMetrics> weights = lb.getNodeWeights();
for (int i = 0; i < 9999; i++) {
LoadBalancer.Node node = lb.getRecipient(entries);
assertNotNull(node);
}
long sentSum = 0;
for (var metrics : weights) {
assertTrue(10 > Math.abs(metrics.sent() - 3333));
sentSum += metrics.sent();
}
assertEquals(9999, sentSum);
for (var metrics : weights) {
metrics.reset();
}
// Simulate 1/1, 1/2, 1/4 processing capacity
for (int i = 0; i < 9999; i++) {
LoadBalancer.Node node = lb.getRecipient(entries);
assertNotNull(node);
if (node.entry.getName().contains("1")) {
lb.received(node, false);
} else if (node.entry.getName().contains("2")) {
if ((i % 2) == 0) {
lb.received(node, false);
}
} else {
if ((i % 4) == 0) {
lb.received(node, false);
}
}
}
sentSum = 0;
long sumPending = 0;
for (var metrics : weights) {
System.out.println("m: s=" + metrics.sent() + " p=" + metrics.pending());
sentSum += metrics.sent();
sumPending += metrics.pending();
}
assertEquals(9999, sentSum);
assertEquals(2039, sumPending);
assertEquals(1332, weights.get(0).sent());
assertEquals(6645, weights.get(1).sent());
assertEquals(2022, weights.get(2).sent());
assertEquals(1020, weights.get(0).pending());
assertEquals(0, weights.get(1).pending());
assertEquals(1019, weights.get(2).pending());
}
private void verifyLoadBalancerOneItemOnly(LoadBalancer lb) {
List<Mirror.Entry> entries = Arrays.asList(new Mirror.Entry("foo/0/default", "tcp/bar:1") );
List<LoadBalancer.NodeMetrics> weights = lb.getNodeWeights();
assertEquals("foo/0/default" , lb.getRecipient(entries).entry.getName());
lb.received(new LoadBalancer.Node(new Mirror.Entry("foo/0/default", "tcp/bar:1"), weights.get(0)), true); // busy
assertEquals("foo/0/default" , lb.getRecipient(entries).entry.getName());
}
@Test
public void testLoadBalancerOneItemOnly() {
verifyLoadBalancerOneItemOnly(new AdaptiveLoadBalancer("foo"));
}
}
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