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Common functionality for HBase
/**
*
* 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.zookeeper;
import java.io.IOException;
import java.util.Map.Entry;
import java.util.Properties;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HConstants;
import org.apache.yetus.audience.InterfaceAudience;
import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;
/**
* Utility methods for reading, and building the ZooKeeper configuration.
*
* The order and priority for reading the config are as follows:
* (1). Property with "hbase.zookeeper.property." prefix from HBase XML
* (2). other zookeeper related properties in HBASE XML
*/
@InterfaceAudience.Private
public final class ZKConfig {
private static final String VARIABLE_START = "${";
private ZKConfig() {
}
/**
* Make a Properties object holding ZooKeeper config.
* Parses the corresponding config options from the HBase XML configs
* and generates the appropriate ZooKeeper properties.
* @param conf Configuration to read from.
* @return Properties holding mappings representing ZooKeeper config file.
*/
public static Properties makeZKProps(Configuration conf) {
return makeZKPropsFromHbaseConfig(conf);
}
/**
* Make a Properties object holding ZooKeeper config.
* Parses the corresponding config options from the HBase XML configs
* and generates the appropriate ZooKeeper properties.
*
* @param conf Configuration to read from.
* @return Properties holding mappings representing ZooKeeper config file.
*/
private static Properties makeZKPropsFromHbaseConfig(Configuration conf) {
Properties zkProperties = new Properties();
// Directly map all of the hbase.zookeeper.property.KEY properties.
// Synchronize on conf so no loading of configs while we iterate
synchronized (conf) {
for (Entry entry : conf) {
String key = entry.getKey();
if (key.startsWith(HConstants.ZK_CFG_PROPERTY_PREFIX)) {
String zkKey = key.substring(HConstants.ZK_CFG_PROPERTY_PREFIX_LEN);
String value = entry.getValue();
// If the value has variables substitutions, need to do a get.
if (value.contains(VARIABLE_START)) {
value = conf.get(key);
}
zkProperties.setProperty(zkKey, value);
}
}
}
// If clientPort is not set, assign the default.
if (zkProperties.getProperty(HConstants.CLIENT_PORT_STR) == null) {
zkProperties.put(HConstants.CLIENT_PORT_STR,
HConstants.DEFAULT_ZOOKEPER_CLIENT_PORT);
}
// Create the server.X properties.
int peerPort = conf.getInt("hbase.zookeeper.peerport", 2888);
int leaderPort = conf.getInt("hbase.zookeeper.leaderport", 3888);
final String[] serverHosts = conf.getStrings(HConstants.ZOOKEEPER_QUORUM,
HConstants.LOCALHOST);
String serverHost;
String address;
String key;
for (int i = 0; i < serverHosts.length; ++i) {
if (serverHosts[i].contains(":")) {
serverHost = serverHosts[i].substring(0, serverHosts[i].indexOf(':'));
} else {
serverHost = serverHosts[i];
}
address = serverHost + ":" + peerPort + ":" + leaderPort;
key = "server." + i;
zkProperties.put(key, address);
}
return zkProperties;
}
/**
* Return the ZK Quorum servers string given the specified configuration
*
* @param conf
* @return Quorum servers String
*/
private static String getZKQuorumServersStringFromHbaseConfig(Configuration conf) {
String defaultClientPort = Integer.toString(
conf.getInt(HConstants.ZOOKEEPER_CLIENT_PORT, HConstants.DEFAULT_ZOOKEPER_CLIENT_PORT));
// Build the ZK quorum server string with "server:clientport" list, separated by ','
final String[] serverHosts =
conf.getStrings(HConstants.ZOOKEEPER_QUORUM, HConstants.LOCALHOST);
return buildZKQuorumServerString(serverHosts, defaultClientPort);
}
/**
* Return the ZK Quorum servers string given the specified configuration.
* @return Quorum servers
*/
public static String getZKQuorumServersString(Configuration conf) {
return getZKQuorumServersStringFromHbaseConfig(conf);
}
/**
* Build the ZK quorum server string with "server:clientport" list, separated by ','
*
* @param serverHosts a list of servers for ZK quorum
* @param clientPort the default client port
* @return the string for a list of "server:port" separated by ","
*/
public static String buildZKQuorumServerString(String[] serverHosts, String clientPort) {
StringBuilder quorumStringBuilder = new StringBuilder();
String serverHost;
for (int i = 0; i < serverHosts.length; ++i) {
if (serverHosts[i].contains(":")) {
serverHost = serverHosts[i]; // just use the port specified from the input
} else {
serverHost = serverHosts[i] + ":" + clientPort;
}
if (i > 0) {
quorumStringBuilder.append(',');
}
quorumStringBuilder.append(serverHost);
}
return quorumStringBuilder.toString();
}
/**
* Verifies that the given key matches the expected format for a ZooKeeper cluster key.
* The Quorum for the ZK cluster can have one the following formats (see examples below):
*
*
* - s1,s2,s3 (no client port in the list, the client port could be obtained from
* clientPort)
* - s1:p1,s2:p2,s3:p3 (with client port, which could be same or different for each server,
* in this case, the clientPort would be ignored)
* - s1:p1,s2,s3:p3 (mix of (1) and (2) - if port is not specified in a server, it would use
* the clientPort; otherwise, it would use the specified port)
*
*
* @param key the cluster key to validate
* @throws IOException if the key could not be parsed
*/
public static void validateClusterKey(String key) throws IOException {
transformClusterKey(key);
}
/**
* Separate the given key into the three configurations it should contain:
* hbase.zookeeper.quorum, hbase.zookeeper.client.port
* and zookeeper.znode.parent
* @param key
* @return the three configuration in the described order
* @throws IOException
*/
public static ZKClusterKey transformClusterKey(String key) throws IOException {
String[] parts = key.split(":");
if (parts.length == 3) {
if (!parts[2].matches("/.*[^/]")) {
throw new IOException("Cluster key passed " + key + " is invalid, the format should be:" +
HConstants.ZOOKEEPER_QUORUM + ":" + HConstants.ZOOKEEPER_CLIENT_PORT + ":"
+ HConstants.ZOOKEEPER_ZNODE_PARENT);
}
return new ZKClusterKey(parts [0], Integer.parseInt(parts [1]), parts [2]);
}
if (parts.length > 3) {
// The quorum could contain client port in server:clientport format, try to transform more.
String zNodeParent = parts [parts.length - 1];
if (!zNodeParent.matches("/.*[^/]")) {
throw new IOException("Cluster key passed " + key + " is invalid, the format should be:"
+ HConstants.ZOOKEEPER_QUORUM + ":" + HConstants.ZOOKEEPER_CLIENT_PORT + ":"
+ HConstants.ZOOKEEPER_ZNODE_PARENT);
}
String clientPort = parts [parts.length - 2];
// The first part length is the total length minus the lengths of other parts and minus 2 ":"
int endQuorumIndex = key.length() - zNodeParent.length() - clientPort.length() - 2;
String quorumStringInput = key.substring(0, endQuorumIndex);
String[] serverHosts = quorumStringInput.split(",");
// The common case is that every server has its own client port specified - this means
// that (total parts - the ZNodeParent part - the ClientPort part) is equal to
// (the number of "," + 1) - "+ 1" because the last server has no ",".
if ((parts.length - 2) == (serverHosts.length + 1)) {
return new ZKClusterKey(quorumStringInput, Integer.parseInt(clientPort), zNodeParent);
}
// For the uncommon case that some servers has no port specified, we need to build the
// server:clientport list using default client port for servers without specified port.
return new ZKClusterKey(
buildZKQuorumServerString(serverHosts, clientPort),
Integer.parseInt(clientPort),
zNodeParent);
}
throw new IOException("Cluster key passed " + key + " is invalid, the format should be:" +
HConstants.ZOOKEEPER_QUORUM + ":" + HConstants.ZOOKEEPER_CLIENT_PORT + ":"
+ HConstants.ZOOKEEPER_ZNODE_PARENT);
}
/**
* Get the key to the ZK ensemble for this configuration without
* adding a name at the end
* @param conf Configuration to use to build the key
* @return ensemble key without a name
*/
public static String getZooKeeperClusterKey(Configuration conf) {
return getZooKeeperClusterKey(conf, null);
}
/**
* Get the key to the ZK ensemble for this configuration and append
* a name at the end
* @param conf Configuration to use to build the key
* @param name Name that should be appended at the end if not empty or null
* @return ensemble key with a name (if any)
*/
public static String getZooKeeperClusterKey(Configuration conf, String name) {
String ensemble = conf.get(HConstants.ZOOKEEPER_QUORUM).replaceAll(
"[\\t\\n\\x0B\\f\\r]", "");
StringBuilder builder = new StringBuilder(ensemble);
builder.append(":");
builder.append(conf.get(HConstants.ZOOKEEPER_CLIENT_PORT));
builder.append(":");
builder.append(conf.get(HConstants.ZOOKEEPER_ZNODE_PARENT));
if (name != null && !name.isEmpty()) {
builder.append(",");
builder.append(name);
}
return builder.toString();
}
/**
* Standardize the ZK quorum string: make it a "server:clientport" list, separated by ','
* @param quorumStringInput a string contains a list of servers for ZK quorum
* @param clientPort the default client port
* @return the string for a list of "server:port" separated by ","
*/
@VisibleForTesting
public static String standardizeZKQuorumServerString(String quorumStringInput,
String clientPort) {
String[] serverHosts = quorumStringInput.split(",");
return buildZKQuorumServerString(serverHosts, clientPort);
}
// The Quorum for the ZK cluster can have one the following format (see examples below):
// (1). s1,s2,s3 (no client port in the list, the client port could be obtained from clientPort)
// (2). s1:p1,s2:p2,s3:p3 (with client port, which could be same or different for each server,
// in this case, the clientPort would be ignored)
// (3). s1:p1,s2,s3:p3 (mix of (1) and (2) - if port is not specified in a server, it would use
// the clientPort; otherwise, it would use the specified port)
@VisibleForTesting
public static class ZKClusterKey {
private String quorumString;
private int clientPort;
private String znodeParent;
ZKClusterKey(String quorumString, int clientPort, String znodeParent) {
this.quorumString = quorumString;
this.clientPort = clientPort;
this.znodeParent = znodeParent;
}
public String getQuorumString() {
return quorumString;
}
public int getClientPort() {
return clientPort;
}
public String getZnodeParent() {
return znodeParent;
}
}
}