/*
* 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.flink.configuration;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import org.apache.flink.annotation.Internal;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Global configuration object for Flink. Similar to Java properties configuration
* objects it includes key-value pairs which represent the framework's configuration.
*/
@Internal
public final class GlobalConfiguration {
private static final Logger LOG = LoggerFactory.getLogger(GlobalConfiguration.class);
public static final String FLINK_CONF_FILENAME = "flink-conf.yaml";
// --------------------------------------------------------------------------------------------
private GlobalConfiguration() {}
// --------------------------------------------------------------------------------------------
private static Configuration dynamicProperties = null;
/**
* Set the process-wide dynamic properties to be merged with the loaded configuration.
*/
public static void setDynamicProperties(Configuration dynamicProperties) {
GlobalConfiguration.dynamicProperties = new Configuration(dynamicProperties);
}
/**
* Get the dynamic properties.
*/
public static Configuration getDynamicProperties() {
return GlobalConfiguration.dynamicProperties;
}
// --------------------------------------------------------------------------------------------
/**
* Loads the global configuration from the environment. Fails if an error occurs during loading. Returns an
* empty configuration object if the environment variable is not set. In production this variable is set but
* tests and local execution/debugging don't have this environment variable set. That's why we should fail
* if it is not set.
* @return Returns the Configuration
*/
public static Configuration loadConfiguration() {
final String configDir = System.getenv(ConfigConstants.ENV_FLINK_CONF_DIR);
if (configDir == null) {
return new Configuration();
}
return loadConfiguration(configDir);
}
/**
* Loads the configuration files from the specified directory.
* <p>
* YAML files are supported as configuration files.
*
* @param configDir
* the directory which contains the configuration files
*/
public static Configuration loadConfiguration(final String configDir) {
if (configDir == null) {
throw new IllegalArgumentException("Given configuration directory is null, cannot load configuration");
}
final File confDirFile = new File(configDir);
if (!(confDirFile.exists())) {
throw new IllegalConfigurationException(
"The given configuration directory name '" + configDir +
"' (" + confDirFile.getAbsolutePath() + ") does not describe an existing directory.");
}
// get Flink yaml configuration file
final File yamlConfigFile = new File(confDirFile, FLINK_CONF_FILENAME);
if (!yamlConfigFile.exists()) {
throw new IllegalConfigurationException(
"The Flink config file '" + yamlConfigFile +
"' (" + confDirFile.getAbsolutePath() + ") does not exist.");
}
Configuration conf = loadYAMLResource(yamlConfigFile);
if(dynamicProperties != null) {
conf.addAll(dynamicProperties);
}
return conf;
}
/**
* Loads a YAML-file of key-value pairs.
* <p>
* Colon and whitespace ": " separate key and value (one per line). The hash tag "#" starts a single-line comment.
* <p>
* Example:
*
* <pre>
* jobmanager.rpc.address: localhost # network address for communication with the job manager
* jobmanager.rpc.port : 6123 # network port to connect to for communication with the job manager
* taskmanager.rpc.port : 6122 # network port the task manager expects incoming IPC connections
* </pre>
* <p>
* This does not span the whole YAML specification, but only the *syntax* of simple YAML key-value pairs (see issue
* #113 on GitHub). If at any point in time, there is a need to go beyond simple key-value pairs syntax
* compatibility will allow to introduce a YAML parser library.
*
* @param file the YAML file to read from
* @see <a href="http://www.yaml.org/spec/1.2/spec.html">YAML 1.2 specification</a>
*/
private static Configuration loadYAMLResource(File file) {
final Configuration config = new Configuration();
try (BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(file)))){
String line;
int lineNo = 0;
while ((line = reader.readLine()) != null) {
lineNo++;
// 1. check for comments
String[] comments = line.split("#", 2);
String conf = comments[0].trim();
// 2. get key and value
if (conf.length() > 0) {
String[] kv = conf.split(": ", 2);
// skip line with no valid key-value pair
if (kv.length == 1) {
LOG.warn("Error while trying to split key and value in configuration file " + file + ":" + lineNo + ": \"" + line + "\"");
continue;
}
String key = kv[0].trim();
String value = kv[1].trim();
// sanity check
if (key.length() == 0 || value.length() == 0) {
LOG.warn("Error after splitting key and value in configuration file " + file + ":" + lineNo + ": \"" + line + "\"");
continue;
}
LOG.info("Loading configuration property: {}, {}", key, value);
config.setString(key, value);
}
}
} catch (IOException e) {
throw new RuntimeException("Error parsing YAML configuration.", e);
}
return config;
}
}