com.netflix.astyanax.connectionpool.impl.TokenAwareConnectionPoolImpl Maven / Gradle / Ivy
/*******************************************************************************
* Copyright 2011 Netflix
*
* Licensed 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 com.netflix.astyanax.connectionpool.impl;
import java.util.Arrays;
import java.util.List;
import java.util.Random;
import java.util.concurrent.atomic.AtomicInteger;
import com.netflix.astyanax.connectionpool.ConnectionFactory;
import com.netflix.astyanax.connectionpool.ConnectionPoolConfiguration;
import com.netflix.astyanax.connectionpool.ConnectionPoolMonitor;
import com.netflix.astyanax.connectionpool.ExecuteWithFailover;
import com.netflix.astyanax.connectionpool.HostConnectionPool;
import com.netflix.astyanax.connectionpool.Operation;
import com.netflix.astyanax.connectionpool.exceptions.ConnectionException;
import com.netflix.astyanax.connectionpool.exceptions.NoAvailableHostsException;
/**
* Connection pool that partitions connections by the hosts which own the token
* being operated on. When a token is not available or an operation is known to
* span multiple tokens (such as a batch mutate or an index query) host pools
* are picked using round robin.
*
* This implementation takes an optimistic approach which is optimized for a
* well functioning ring with all nodes up and keeps downed hosts in the
* internal data structures.
*
* @author elandau
*
* @param
*/
public class TokenAwareConnectionPoolImpl extends AbstractHostPartitionConnectionPool {
private AtomicInteger roundRobinCounter = new AtomicInteger(new Random().nextInt(997));
private static final int MAX_RR_COUNTER = Integer.MAX_VALUE/2;
public TokenAwareConnectionPoolImpl(ConnectionPoolConfiguration configuration, ConnectionFactory factory,
ConnectionPoolMonitor monitor) {
super(configuration, factory, monitor);
}
@SuppressWarnings("unchecked")
public ExecuteWithFailover newExecuteWithFailover(Operation op) throws ConnectionException {
try {
List> pools;
boolean isSorted = false;
if (op.getPinnedHost() != null) {
HostConnectionPool pool = hosts.get(op.getPinnedHost());
if (pool == null) {
throw new NoAvailableHostsException("Host " + op.getPinnedHost() + " not active");
}
pools = Arrays.> asList(pool);
}
else {
TokenHostConnectionPoolPartition partition = topology.getPartition(op.getRowKey());
pools = partition.getPools();
isSorted = partition.isSorted();
}
int index = roundRobinCounter.incrementAndGet();
if (index > MAX_RR_COUNTER) {
roundRobinCounter.set(0);
}
AbstractExecuteWithFailoverImpl executeWithFailover = null;
switch (config.getHostSelectorStrategy()) {
case ROUND_ROBIN:
executeWithFailover = new RoundRobinExecuteWithFailover(config, monitor, pools, isSorted ? 0 : index);
break;
case LEAST_OUTSTANDING:
executeWithFailover = new LeastOutstandingExecuteWithFailover(config, monitor, pools);
break;
default:
executeWithFailover = new RoundRobinExecuteWithFailover(config, monitor, pools, isSorted ? 0 : index);
break;
}
return executeWithFailover;
}
catch (ConnectionException e) {
monitor.incOperationFailure(e.getHost(), e);
throw e;
}
}
}