| /** |
| * 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.hadoop.hbase.ipc; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.yetus.audience.InterfaceAudience; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.apache.hadoop.hbase.net.Address; |
| import org.apache.hadoop.hbase.util.EnvironmentEdgeManager; |
| |
| /** |
| * A class to manage a list of servers that failed recently. |
| */ |
| @InterfaceAudience.Private |
| public class FailedServers { |
| private final Map<Address, Long> failedServers = new HashMap<Address, Long>(); |
| private long latestExpiry = 0; |
| private final int recheckServersTimeout; |
| private static final Logger LOG = LoggerFactory.getLogger(FailedServers.class); |
| |
| public FailedServers(Configuration conf) { |
| this.recheckServersTimeout = conf.getInt( |
| RpcClient.FAILED_SERVER_EXPIRY_KEY, RpcClient.FAILED_SERVER_EXPIRY_DEFAULT); |
| } |
| |
| /** |
| * Add an address to the list of the failed servers list. |
| */ |
| public synchronized void addToFailedServers(Address address, Throwable throwable) { |
| final long expiry = EnvironmentEdgeManager.currentTime() + recheckServersTimeout; |
| this.failedServers.put(address, expiry); |
| this.latestExpiry = expiry; |
| if (LOG.isDebugEnabled()) { |
| LOG.debug( |
| "Added failed server with address " + address + " to list caused by " |
| + throwable.toString()); |
| } |
| } |
| |
| /** |
| * Check if the server should be considered as bad. Clean the old entries of the list. |
| * |
| * @return true if the server is in the failed servers list |
| */ |
| public synchronized boolean isFailedServer(final Address address) { |
| if (failedServers.isEmpty()) { |
| return false; |
| } |
| final long now = EnvironmentEdgeManager.currentTime(); |
| if (now > this.latestExpiry) { |
| failedServers.clear(); |
| return false; |
| } |
| Long expiry = this.failedServers.get(address); |
| if (expiry == null) { |
| return false; |
| } |
| if (expiry >= now) { |
| return true; |
| } else { |
| this.failedServers.remove(address); |
| } |
| return false; |
| } |
| } |