/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file 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,
* 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 org.apache.accumulo.core.client.impl;
import static java.nio.charset.StandardCharsets.UTF_8;
import static java.util.Objects.requireNonNull;
import java.util.List;
import org.apache.accumulo.core.Constants;
import org.apache.accumulo.core.client.AccumuloException;
import org.apache.accumulo.core.client.AccumuloSecurityException;
import org.apache.accumulo.core.client.Instance;
import org.apache.accumulo.core.client.impl.thrift.ThriftSecurityException;
import org.apache.accumulo.core.replication.thrift.ReplicationCoordinator;
import org.apache.accumulo.core.replication.thrift.ReplicationServicer;
import org.apache.accumulo.core.rpc.ThriftUtil;
import org.apache.accumulo.core.zookeeper.ZooUtil;
import org.apache.accumulo.fate.zookeeper.ZooReader;
import org.apache.thrift.TServiceClient;
import org.apache.thrift.transport.TTransportException;
import org.apache.zookeeper.KeeperException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.net.HostAndPort;
public class ReplicationClient {
private static final Logger log = LoggerFactory.getLogger(ReplicationClient.class);
/**
* @param context
* the client session for the peer replicant
* @return Client to the ReplicationCoordinator service
*/
public static ReplicationCoordinator.Client getCoordinatorConnectionWithRetry(ClientContext context) throws AccumuloException {
requireNonNull(context);
Instance instance = context.getInstance();
for (int attempts = 1; attempts <= 10; attempts++) {
ReplicationCoordinator.Client result = getCoordinatorConnection(context);
if (result != null)
return result;
log.debug("Could not get ReplicationCoordinator connection to {}, will retry", instance.getInstanceName());
try {
Thread.sleep(attempts * 250);
} catch (InterruptedException e) {
throw new AccumuloException(e);
}
}
throw new AccumuloException("Timed out trying to communicate with master from " + instance.getInstanceName());
}
public static ReplicationCoordinator.Client getCoordinatorConnection(ClientContext context) {
Instance instance = context.getInstance();
List<String> locations = instance.getMasterLocations();
if (locations.size() == 0) {
log.debug("No masters for replication to instance {}", instance.getInstanceName());
return null;
}
// This is the master thrift service, we just want the hostname, not the port
String masterThriftService = locations.get(0);
if (masterThriftService.endsWith(":0")) {
log.warn("Master found for {} did not have real location {}", instance.getInstanceName(), masterThriftService);
return null;
}
String zkPath = ZooUtil.getRoot(instance) + Constants.ZMASTER_REPLICATION_COORDINATOR_ADDR;
String replCoordinatorAddr;
log.debug("Using ZooKeeper quorum at {} with path {} to find peer Master information", instance.getZooKeepers(), zkPath);
// Get the coordinator port for the master we're trying to connect to
try {
ZooReader reader = new ZooReader(instance.getZooKeepers(), instance.getZooKeepersSessionTimeOut());
replCoordinatorAddr = new String(reader.getData(zkPath, null), UTF_8);
} catch (KeeperException | InterruptedException e) {
log.error("Could not fetch remote coordinator port", e);
return null;
}
// Throw the hostname and port through HostAndPort to get some normalization
HostAndPort coordinatorAddr = HostAndPort.fromString(replCoordinatorAddr);
log.debug("Connecting to master at {}", coordinatorAddr);
try {
// Master requests can take a long time: don't ever time out
ReplicationCoordinator.Client client = ThriftUtil.getClientNoTimeout(new ReplicationCoordinator.Client.Factory(), coordinatorAddr, context);
return client;
} catch (TTransportException tte) {
log.debug("Failed to connect to master coordinator service ({})", coordinatorAddr, tte);
return null;
}
}
/**
* Attempt a single time to create a ReplicationServicer client to the given host
*
* @param context
* The client session for the peer replicant
* @param server
* Server to connect to
* @param timeout
* RPC timeout in milliseconds
* @return A ReplicationServicer client to the given host in the given instance
*/
public static ReplicationServicer.Client getServicerConnection(ClientContext context, HostAndPort server, long timeout) throws TTransportException {
requireNonNull(context);
requireNonNull(server);
try {
return ThriftUtil.getClient(new ReplicationServicer.Client.Factory(), server, context, timeout);
} catch (TTransportException tte) {
log.debug("Failed to connect to servicer ({}), will retry...", server, tte);
throw tte;
}
}
public static void close(ReplicationCoordinator.Iface iface) {
TServiceClient client = (TServiceClient) iface;
if (client != null && client.getInputProtocol() != null && client.getInputProtocol().getTransport() != null) {
ThriftTransportPool.getInstance().returnTransport(client.getInputProtocol().getTransport());
} else {
log.debug("Attempt to close null connection to the remote system", new Exception());
}
}
public static void close(ReplicationServicer.Iface iface) {
TServiceClient client = (TServiceClient) iface;
if (client != null && client.getInputProtocol() != null && client.getInputProtocol().getTransport() != null) {
ThriftTransportPool.getInstance().returnTransport(client.getInputProtocol().getTransport());
} else {
log.debug("Attempt to close null connection to the remote system", new Exception());
}
}
public static <T> T executeCoordinatorWithReturn(ClientContext context, ClientExecReturn<T,ReplicationCoordinator.Client> exec) throws AccumuloException,
AccumuloSecurityException {
ReplicationCoordinator.Client client = null;
for (int i = 0; i < 10; i++) {
try {
client = getCoordinatorConnectionWithRetry(context);
return exec.execute(client);
} catch (TTransportException tte) {
log.debug("ReplicationClient coordinator request failed, retrying ... ", tte);
try {
Thread.sleep(100);
} catch (InterruptedException e) {
throw new AccumuloException(e);
}
} catch (ThriftSecurityException e) {
throw new AccumuloSecurityException(e.user, e.code, e);
} catch (AccumuloException e) {
throw e;
} catch (Exception e) {
throw new AccumuloException(e);
} finally {
if (client != null)
close(client);
}
}
throw new AccumuloException("Could not connect to ReplicationCoordinator at " + context.getInstance().getInstanceName());
}
public static <T> T executeServicerWithReturn(ClientContext context, HostAndPort tserver, ClientExecReturn<T,ReplicationServicer.Client> exec, long timeout)
throws AccumuloException, AccumuloSecurityException, TTransportException {
ReplicationServicer.Client client = null;
while (true) {
try {
client = getServicerConnection(context, tserver, timeout);
return exec.execute(client);
} catch (ThriftSecurityException e) {
throw new AccumuloSecurityException(e.user, e.code, e);
} catch (AccumuloException e) {
throw e;
} catch (Exception e) {
throw new AccumuloException(e);
} finally {
if (client != null)
close(client);
}
}
}
}