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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.solr.cloud;
import org.apache.solr.common.SolrException;
import org.apache.zookeeper.server.ServerConfig;
import org.apache.zookeeper.server.ZooKeeperServerMain;
import org.apache.zookeeper.server.quorum.QuorumPeer;
import org.apache.zookeeper.server.quorum.QuorumPeerConfig;
import org.apache.zookeeper.server.quorum.QuorumPeerMain;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.invoke.MethodHandles;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.nio.charset.StandardCharsets;
import java.util.Map;
import java.util.Properties;
import java.util.regex.Pattern;
public class SolrZkServer {
private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
String zkRun;
String zkHost;
int solrPort;
Properties props;
SolrZkServerProps zkProps;
private Thread zkThread; // the thread running a zookeeper server, only if zkRun is set
private String dataHome;
private String confHome;
public SolrZkServer(String zkRun, String zkHost, String dataHome, String confHome, int solrPort) {
this.zkRun = zkRun;
this.zkHost = zkHost;
this.dataHome = dataHome;
this.confHome = confHome;
this.solrPort = solrPort;
}
public String getClientString() {
if (zkHost != null) return zkHost;
if (zkProps == null) return null;
// if the string wasn't passed as zkHost, then use the standalone server we started
if (zkRun == null) return null;
return "localhost:" + zkProps.getClientPortAddress().getPort();
}
public void parseConfig() {
if (zkProps == null) {
zkProps = new SolrZkServerProps();
// set default data dir
// TODO: use something based on IP+port??? support ensemble all from same solr home?
zkProps.setDataDir(dataHome);
zkProps.zkRun = zkRun;
zkProps.solrPort = Integer.toString(solrPort);
}
try {
props = SolrZkServerProps.getProperties(confHome + '/' + "zoo.cfg");
SolrZkServerProps.injectServers(props, zkRun, zkHost);
if (props.getProperty("clientPort") == null) {
props.setProperty("clientPort", Integer.toString(solrPort + 1000));
}
zkProps.parseProperties(props);
} catch (QuorumPeerConfig.ConfigException | IOException e) {
if (zkRun != null)
throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, e);
}
}
public Map getServers() {
return zkProps.getServers();
}
public void start() {
if (zkRun == null) return;
zkThread = new Thread() {
@Override
public void run() {
try {
if (zkProps.getServers().size() > 1) {
QuorumPeerMain zkServer = new QuorumPeerMain();
zkServer.runFromConfig(zkProps);
} else {
ServerConfig sc = new ServerConfig();
sc.readFrom(zkProps);
ZooKeeperServerMain zkServer = new ZooKeeperServerMain();
zkServer.runFromConfig(sc);
}
log.info("ZooKeeper Server exited.");
} catch (Exception e) {
log.error("ZooKeeper Server ERROR", e);
throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, e);
}
}
};
if (zkProps.getServers().size() > 1) {
log.info("STARTING EMBEDDED ENSEMBLE ZOOKEEPER SERVER at port " + zkProps.getClientPortAddress().getPort());
} else {
log.info("STARTING EMBEDDED STANDALONE ZOOKEEPER SERVER at port " + zkProps.getClientPortAddress().getPort());
}
zkThread.setDaemon(true);
zkThread.start();
try {
Thread.sleep(500); // pause for ZooKeeper to start
} catch (Exception e) {
log.error("STARTING ZOOKEEPER", e);
}
}
public void stop() {
if (zkRun == null) return;
zkThread.interrupt();
}
}
// Allows us to set a default for the data dir before parsing
// zoo.cfg (which validates that there is a dataDir)
class SolrZkServerProps extends QuorumPeerConfig {
private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
private static final Pattern MISSING_MYID_FILE_PATTERN = Pattern.compile(".*myid file is missing$");
String solrPort; // port that Solr is listening on
String zkRun;
/**
* Parse a ZooKeeper configuration file
* @param path the patch of the configuration file
* @throws ConfigException error processing configuration
*/
public static Properties getProperties(String path) throws ConfigException {
File configFile = new File(path);
log.info("Reading configuration from: " + configFile);
try {
if (!configFile.exists()) {
throw new IllegalArgumentException(configFile.toString()
+ " file is missing");
}
Properties cfg = new Properties();
FileInputStream in = new FileInputStream(configFile);
try {
cfg.load(new InputStreamReader(in, StandardCharsets.UTF_8));
} finally {
in.close();
}
return cfg;
} catch (IOException | IllegalArgumentException e) {
throw new ConfigException("Error processing " + path, e);
}
}
// Adds server.x if they don't exist, based on zkHost if it does exist.
// Given zkHost=localhost:1111,localhost:2222 this will inject
// server.0=localhost:1112:1113
// server.1=localhost:2223:2224
public static void injectServers(Properties props, String zkRun, String zkHost) {
// if clientPort not already set, use zkRun
if (zkRun != null && props.getProperty("clientPort")==null) {
int portIdx = zkRun.lastIndexOf(':');
if (portIdx > 0) {
String portStr = zkRun.substring(portIdx+1);
props.setProperty("clientPort", portStr);
}
}
boolean hasServers = hasServers(props);
if (!hasServers && zkHost != null) {
int alg = Integer.parseInt(props.getProperty("electionAlg","3").trim());
String[] hosts = zkHost.split(",");
int serverNum = 0;
for (String hostAndPort : hosts) {
hostAndPort = hostAndPort.trim();
int portIdx = hostAndPort.lastIndexOf(':');
String clientPortStr = hostAndPort.substring(portIdx+1);
int clientPort = Integer.parseInt(clientPortStr);
String host = hostAndPort.substring(0,portIdx);
String serverStr = host + ':' + (clientPort+1);
// zk leader election algorithms other than 0 need an extra port for leader election.
if (alg != 0) {
serverStr = serverStr + ':' + (clientPort+2);
}
props.setProperty("server."+serverNum, serverStr);
serverNum++;
}
}
}
public static boolean hasServers(Properties props) {
for (Object key : props.keySet())
if (((String)key).startsWith("server."))
return true;
return false;
}
// called by the modified version of parseProperties
// when the myid file is missing.
public Long getMyServerId() {
if (zkRun == null && solrPort == null) return null;
Map slist = getServers();
String myHost = "localhost";
InetSocketAddress thisAddr = null;
if (zkRun != null && zkRun.length()>0) {
String parts[] = zkRun.split(":");
myHost = parts[0];
thisAddr = new InetSocketAddress(myHost, Integer.parseInt(parts[1]) + 1);
} else {
// default to localhost:
thisAddr = new InetSocketAddress(myHost, Integer.parseInt(solrPort)+1001);
}
// first try a straight match by host
Long me = null;
boolean multiple = false;
int port = 0;
for (QuorumPeer.QuorumServer server : slist.values()) {
if (server.addr.getHostName().equals(myHost)) {
multiple = me!=null;
me = server.id;
port = server.addr.getPort();
}
}
if (!multiple) {
// only one host matched... assume it's me.
setClientPort(port - 1);
return me;
}
if (me == null) {
// no hosts matched.
return null;
}
// multiple matches... try to figure out by port.
for (QuorumPeer.QuorumServer server : slist.values()) {
if (server.addr.equals(thisAddr)) {
if (clientPortAddress == null || clientPortAddress.getPort() <= 0)
setClientPort(server.addr.getPort() - 1);
return server.id;
}
}
return null;
}
public void setDataDir(String dataDir) {
this.dataDir = dataDir;
}
public void setClientPort(int clientPort) {
if (clientPortAddress != null) {
try {
this.clientPortAddress = new InetSocketAddress(
InetAddress.getByName(clientPortAddress.getHostName()), clientPort);
} catch (UnknownHostException e) {
throw new RuntimeException(e);
}
} else {
this.clientPortAddress = new InetSocketAddress(clientPort);
}
}
/**
* Parse config from a Properties.
* @param zkProp Properties to parse from.
*/
@Override
public void parseProperties(Properties zkProp)
throws IOException, ConfigException {
try {
super.parseProperties(zkProp);
} catch (IllegalArgumentException e) {
if (MISSING_MYID_FILE_PATTERN.matcher(e.getMessage()).matches()) {
Long myid = getMyServerId();
if (myid != null) {
serverId = myid;
return;
}
if (zkRun == null) return;
}
throw e;
}
}
}
