/*
* 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.server.master.state;
import java.util.ArrayList;
import java.util.List;
import org.apache.accumulo.core.Constants;
import org.apache.accumulo.core.master.thrift.DeadServer;
import org.apache.accumulo.fate.zookeeper.IZooReaderWriter;
import org.apache.accumulo.fate.zookeeper.ZooUtil.NodeExistsPolicy;
import org.apache.accumulo.fate.zookeeper.ZooUtil.NodeMissingPolicy;
import org.apache.accumulo.server.zookeeper.ZooReaderWriter;
import org.apache.log4j.Logger;
import org.apache.zookeeper.data.Stat;
import org.apache.zookeeper.KeeperException.NoNodeException;
public class DeadServerList {
private static final Logger log = Logger.getLogger(DeadServerList.class);
private final String path;
public DeadServerList(String path) {
this.path = path;
IZooReaderWriter zoo = ZooReaderWriter.getInstance();
try {
zoo.mkdirs(path);
} catch (Exception ex) {
log.error("Unable to make parent directories of " + path, ex);
}
}
public List<DeadServer> getList() {
List<DeadServer> result = new ArrayList<DeadServer>();
IZooReaderWriter zoo = ZooReaderWriter.getInstance();
try {
List<String> children = zoo.getChildren(path);
if (children != null) {
for (String child : children) {
Stat stat = new Stat();
byte[] data;
try {
data = zoo.getData(path + "/" + child, stat);
} catch (NoNodeException nne) {
// Another thread or process can delete child while this loop is running.
// We ignore this error since it's harmless if we miss the deleted server
// in the dead server list.
continue;
}
DeadServer server = new DeadServer(child, stat.getMtime(), new String(data, Constants.UTF8));
result.add(server);
}
}
} catch (Exception ex) {
log.error(ex, ex);
}
return result;
}
public void delete(String server) {
IZooReaderWriter zoo = ZooReaderWriter.getInstance();
try {
zoo.recursiveDelete(path + "/" + server, NodeMissingPolicy.SKIP);
} catch (Exception ex) {
log.error(ex, ex);
}
}
public void post(String server, String cause) {
IZooReaderWriter zoo = ZooReaderWriter.getInstance();
try {
zoo.putPersistentData(path + "/" + server, cause.getBytes(Constants.UTF8), NodeExistsPolicy.SKIP);
} catch (Exception ex) {
log.error(ex, ex);
}
}
}