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* 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,
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package org.apache.cassandra.locator;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import org.junit.BeforeClass;
import org.junit.Test;
import org.apache.cassandra.SchemaLoader;
import org.apache.cassandra.schema.Schema;
import org.apache.cassandra.db.Keyspace;
import org.apache.cassandra.dht.IPartitioner;
import org.apache.cassandra.dht.OrderPreservingPartitioner;
import org.apache.cassandra.dht.OrderPreservingPartitioner.StringToken;
import org.apache.cassandra.dht.RandomPartitioner.BigIntegerToken;
import org.apache.cassandra.dht.Token;
import org.apache.cassandra.schema.KeyspaceMetadata;
import org.apache.cassandra.schema.KeyspaceParams;
import org.apache.cassandra.service.PendingRangeCalculatorService;
import org.apache.cassandra.service.StorageServiceAccessor;
import org.apache.cassandra.utils.ByteBufferUtil;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
public class SimpleStrategyTest
{
public static final String KEYSPACE1 = "SimpleStrategyTest";
@BeforeClass
public static void defineSchema() throws Exception
{
SchemaLoader.prepareServer();
SchemaLoader.createKeyspace(KEYSPACE1, KeyspaceParams.simple(1));
}
@Test
public void tryValidKeyspace()
{
assert Keyspace.open(KEYSPACE1).getReplicationStrategy() != null;
}
@Test
public void testBigIntegerEndpoints() throws UnknownHostException
{
List<Token> endpointTokens = new ArrayList<Token>();
List<Token> keyTokens = new ArrayList<Token>();
for (int i = 0; i < 5; i++) {
endpointTokens.add(new BigIntegerToken(String.valueOf(10 * i)));
keyTokens.add(new BigIntegerToken(String.valueOf(10 * i + 5)));
}
verifyGetNaturalEndpoints(endpointTokens.toArray(new Token[0]), keyTokens.toArray(new Token[0]));
}
@Test
public void testStringEndpoints() throws UnknownHostException
{
IPartitioner partitioner = OrderPreservingPartitioner.instance;
List<Token> endpointTokens = new ArrayList<Token>();
List<Token> keyTokens = new ArrayList<Token>();
for (int i = 0; i < 5; i++) {
endpointTokens.add(new StringToken(String.valueOf((char)('a' + i * 2))));
keyTokens.add(partitioner.getToken(ByteBufferUtil.bytes(String.valueOf((char) ('a' + i * 2 + 1)))));
}
verifyGetNaturalEndpoints(endpointTokens.toArray(new Token[0]), keyTokens.toArray(new Token[0]));
}
// given a list of endpoint tokens, and a set of key tokens falling between the endpoint tokens,
// make sure that the Strategy picks the right endpoints for the keys.
private void verifyGetNaturalEndpoints(Token[] endpointTokens, Token[] keyTokens) throws UnknownHostException
{
TokenMetadata tmd;
AbstractReplicationStrategy strategy;
for (String keyspaceName : Schema.instance.getNonLocalStrategyKeyspaces())
{
tmd = new TokenMetadata();
strategy = getStrategy(keyspaceName, tmd);
List<InetAddress> hosts = new ArrayList<InetAddress>();
for (int i = 0; i < endpointTokens.length; i++)
{
InetAddress ep = InetAddress.getByName("127.0.0." + String.valueOf(i + 1));
tmd.updateNormalToken(endpointTokens[i], ep);
hosts.add(ep);
}
for (int i = 0; i < keyTokens.length; i++)
{
List<InetAddress> endpoints = strategy.getNaturalEndpoints(keyTokens[i]);
assertEquals(strategy.getReplicationFactor(), endpoints.size());
List<InetAddress> correctEndpoints = new ArrayList<InetAddress>();
for (int j = 0; j < endpoints.size(); j++)
correctEndpoints.add(hosts.get((i + j + 1) % hosts.size()));
assertEquals(new HashSet<InetAddress>(correctEndpoints), new HashSet<InetAddress>(endpoints));
}
}
}
@Test
public void testGetEndpointsDuringBootstrap() throws UnknownHostException
{
// the token difference will be RING_SIZE * 2.
final int RING_SIZE = 10;
TokenMetadata tmd = new TokenMetadata();
TokenMetadata oldTmd = StorageServiceAccessor.setTokenMetadata(tmd);
Token[] endpointTokens = new Token[RING_SIZE];
Token[] keyTokens = new Token[RING_SIZE];
for (int i = 0; i < RING_SIZE; i++)
{
endpointTokens[i] = new BigIntegerToken(String.valueOf(RING_SIZE * 2 * i));
keyTokens[i] = new BigIntegerToken(String.valueOf(RING_SIZE * 2 * i + RING_SIZE));
}
List<InetAddress> hosts = new ArrayList<InetAddress>();
for (int i = 0; i < endpointTokens.length; i++)
{
InetAddress ep = InetAddress.getByName("127.0.0." + String.valueOf(i + 1));
tmd.updateNormalToken(endpointTokens[i], ep);
hosts.add(ep);
}
// bootstrap at the end of the ring
Token bsToken = new BigIntegerToken(String.valueOf(210));
InetAddress bootstrapEndpoint = InetAddress.getByName("127.0.0.11");
tmd.addBootstrapToken(bsToken, bootstrapEndpoint);
AbstractReplicationStrategy strategy = null;
for (String keyspaceName : Schema.instance.getNonLocalStrategyKeyspaces())
{
strategy = getStrategy(keyspaceName, tmd);
PendingRangeCalculatorService.calculatePendingRanges(strategy, keyspaceName);
int replicationFactor = strategy.getReplicationFactor();
for (int i = 0; i < keyTokens.length; i++)
{
Collection<InetAddress> endpoints = tmd.getWriteEndpoints(keyTokens[i], keyspaceName, strategy.getNaturalEndpoints(keyTokens[i]));
assertTrue(endpoints.size() >= replicationFactor);
for (int j = 0; j < replicationFactor; j++)
{
//Check that the old nodes are definitely included
assertTrue(endpoints.contains(hosts.get((i + j + 1) % hosts.size())));
}
// bootstrapEndpoint should be in the endpoints for i in MAX-RF to MAX, but not in any earlier ep.
if (i < RING_SIZE - replicationFactor)
assertFalse(endpoints.contains(bootstrapEndpoint));
else
assertTrue(endpoints.contains(bootstrapEndpoint));
}
}
StorageServiceAccessor.setTokenMetadata(oldTmd);
}
private AbstractReplicationStrategy getStrategy(String keyspaceName, TokenMetadata tmd)
{
KeyspaceMetadata ksmd = Schema.instance.getKeyspaceMetadata(keyspaceName);
return AbstractReplicationStrategy.createReplicationStrategy(
keyspaceName,
ksmd.params.replication.klass,
tmd,
new SimpleSnitch(),
ksmd.params.replication.options);
}
}