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* 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
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package org.apache.cassandra.locator;
import java.io.IOException;
import java.util.*;
import java.util.concurrent.TimeUnit;
import org.junit.BeforeClass;
import org.junit.Test;
import org.apache.cassandra.Util;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.exceptions.ConfigurationException;
import org.apache.cassandra.service.StorageService;
import org.apache.cassandra.utils.FBUtilities;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
public class DynamicEndpointSnitchTest
{
@BeforeClass
public static void setupDD()
{
DatabaseDescriptor.daemonInitialization();
}
private static void setScores(DynamicEndpointSnitch dsnitch, int rounds, List<InetAddressAndPort> hosts, Integer... scores) throws InterruptedException
{
for (int round = 0; round < rounds; round++)
{
for (int i = 0; i < hosts.size(); i++)
dsnitch.receiveTiming(hosts.get(i), scores[i], MILLISECONDS);
}
Thread.sleep(150);
}
private static EndpointsForRange full(InetAddressAndPort... endpoints)
{
EndpointsForRange.Builder rlist = EndpointsForRange.builder(ReplicaUtils.FULL_RANGE, endpoints.length);
for (InetAddressAndPort endpoint: endpoints)
{
rlist.add(ReplicaUtils.full(endpoint));
}
return rlist.build();
}
@Test
public void testSnitch() throws InterruptedException, IOException, ConfigurationException
{
// do this because SS needs to be initialized before DES can work properly.
DatabaseDescriptor.setDynamicBadnessThreshold(0.1);
StorageService.instance.unsafeInitialize();
SimpleSnitch ss = new SimpleSnitch();
DynamicEndpointSnitch dsnitch = new DynamicEndpointSnitch(ss, String.valueOf(ss.hashCode()));
InetAddressAndPort self = FBUtilities.getBroadcastAddressAndPort();
InetAddressAndPort host1 = InetAddressAndPort.getByName("127.0.0.2");
InetAddressAndPort host2 = InetAddressAndPort.getByName("127.0.0.3");
InetAddressAndPort host3 = InetAddressAndPort.getByName("127.0.0.4");
InetAddressAndPort host4 = InetAddressAndPort.getByName("127.0.0.5");
List<InetAddressAndPort> hosts = Arrays.asList(host1, host2, host3);
// first, make all hosts equal
setScores(dsnitch, 1, hosts, 10, 10, 10);
EndpointsForRange order = full(host1, host2, host3);
Util.assertRCEquals(order, dsnitch.sortedByProximity(self, full(host1, host2, host3)));
// make host1 a little worse
setScores(dsnitch, 1, hosts, 20, 10, 10);
order = full(host2, host3, host1);
Util.assertRCEquals(order, dsnitch.sortedByProximity(self, full(host1, host2, host3)));
// make host2 as bad as host1
setScores(dsnitch, 2, hosts, 15, 20, 10);
order = full(host3, host1, host2);
Util.assertRCEquals(order, dsnitch.sortedByProximity(self, full(host1, host2, host3)));
// make host3 the worst
setScores(dsnitch, 3, hosts, 10, 10, 30);
order = full(host1, host2, host3);
Util.assertRCEquals(order, dsnitch.sortedByProximity(self, full(host1, host2, host3)));
// make host3 equal to the others
setScores(dsnitch, 5, hosts, 10, 10, 10);
order = full(host1, host2, host3);
Util.assertRCEquals(order, dsnitch.sortedByProximity(self, full(host1, host2, host3)));
/// Tests CASSANDRA-6683 improvements
// make the scores differ enough from the ideal order that we sort by score; under the old
// dynamic snitch behavior (where we only compared neighbors), these wouldn't get sorted
setScores(dsnitch, 20, hosts, 10, 70, 20);
order = full(host1, host3, host2);
Util.assertRCEquals(order, dsnitch.sortedByProximity(self, full(host1, host2, host3)));
order = full(host4, host1, host3, host2);
Util.assertRCEquals(order, dsnitch.sortedByProximity(self, full(host1, host2, host3, host4)));
setScores(dsnitch, 20, hosts, 10, 10, 10);
order = full(host4, host1, host2, host3);
Util.assertRCEquals(order, dsnitch.sortedByProximity(self, full(host1, host2, host3, host4)));
}
}