| /* |
| * 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.clientImpl; |
| |
| 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.clientImpl.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.util.HostAndPort; |
| 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; |
| |
| 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); |
| |
| 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", |
| context.getInstanceName()); |
| try { |
| Thread.sleep(attempts * 250L); |
| } catch (InterruptedException e) { |
| throw new AccumuloException(e); |
| } |
| } |
| |
| throw new AccumuloException( |
| "Timed out trying to communicate with manager from " + context.getInstanceName()); |
| } |
| |
| public static ReplicationCoordinator.Client getCoordinatorConnection(ClientContext context) { |
| List<String> locations = context.getManagerLocations(); |
| |
| if (locations.isEmpty()) { |
| log.debug("No managers for replication to instance {}", context.getInstanceName()); |
| return null; |
| } |
| |
| // This is the manager thrift service, we just want the hostname, not the port |
| String managerThriftService = locations.get(0); |
| if (managerThriftService.endsWith(":0")) { |
| log.warn("Manager found for {} did not have real location {}", context.getInstanceName(), |
| managerThriftService); |
| return null; |
| } |
| |
| String zkPath = context.getZooKeeperRoot() + Constants.ZMANAGER_REPLICATION_COORDINATOR_ADDR; |
| String replCoordinatorAddr; |
| |
| log.debug("Using ZooKeeper quorum at {} with path {} to find peer Manager information", |
| context.getZooKeepers(), zkPath); |
| |
| // Get the coordinator port for the manager we're trying to connect to |
| try { |
| ZooReader reader = |
| new ZooReader(context.getZooKeepers(), context.getZooKeepersSessionTimeOut()); |
| replCoordinatorAddr = new String(reader.getData(zkPath), 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 manager at {}", coordinatorAddr); |
| |
| try { |
| // Manager requests can take a long time: don't ever time out |
| return ThriftUtil.getClientNoTimeout(new ReplicationCoordinator.Client.Factory(), |
| coordinatorAddr, context); |
| } catch (TTransportException tte) { |
| log.debug("Failed to connect to manager 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; |
| } |
| } |
| |
| private static void close(TServiceClient client) { |
| 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.getInstanceName()); |
| } |
| |
| public static <T> T executeServicerWithReturn(ClientContext context, HostAndPort tserver, |
| ClientExecReturn<T,ReplicationServicer.Client> exec, long timeout) |
| throws AccumuloException, AccumuloSecurityException { |
| ReplicationServicer.Client client = null; |
| 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); |
| } |
| } |
| |
| } |