org.apache.hadoop.hbase.ipc.FailedServers Maven / Gradle / Ivy
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* 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.hadoop.hbase.net.Address;
import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
import org.apache.yetus.audience.InterfaceAudience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A class to manage a list of servers that failed recently.
*/
@InterfaceAudience.Private
public class FailedServers {
private final Map failedServers = new HashMap();
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;
}
}