heron/scheduler-core/src/java/com/twitter/heron/scheduler/RuntimeManagerMain.java - incubator-heron - Git at Google

 // Copyright 2016 Twitter. All rights reserved.
 //
 // Licensed 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 com.twitter.heron.scheduler;

 import java.io.IOException;
 import java.io.PrintStream;
 import java.nio.charset.StandardCharsets;
 import java.util.logging.Level;
 import java.util.logging.Logger;

 import org.apache.commons.cli.CommandLine;
 import org.apache.commons.cli.CommandLineParser;
 import org.apache.commons.cli.DefaultParser;
 import org.apache.commons.cli.HelpFormatter;
 import org.apache.commons.cli.Option;
 import org.apache.commons.cli.Options;
 import org.apache.commons.cli.ParseException;

 import com.twitter.heron.common.basics.DryRunFormatType;
 import com.twitter.heron.common.basics.SysUtils;
 import com.twitter.heron.common.utils.logging.LoggingHelper;
 import com.twitter.heron.proto.system.ExecutionEnvironment;
 import com.twitter.heron.scheduler.client.ISchedulerClient;
 import com.twitter.heron.scheduler.client.SchedulerClientFactory;
 import com.twitter.heron.scheduler.dryrun.UpdateDryRunResponse;
 import com.twitter.heron.scheduler.utils.DryRunRenders;
 import com.twitter.heron.spi.common.Config;
 import com.twitter.heron.spi.common.ConfigLoader;
 import com.twitter.heron.spi.common.Context;
 import com.twitter.heron.spi.common.Key;
 import com.twitter.heron.spi.packing.PackingException;
 import com.twitter.heron.spi.scheduler.SchedulerException;
 import com.twitter.heron.spi.statemgr.IStateManager;
 import com.twitter.heron.spi.statemgr.SchedulerStateManagerAdaptor;
 import com.twitter.heron.spi.utils.ReflectionUtils;
 import com.twitter.heron.spi.utils.TMasterException;

 public class RuntimeManagerMain {
   private static final Logger LOG = Logger.getLogger(RuntimeManagerMain.class.getName());

   // Print usage options
   private static void usage(Options options) {
     HelpFormatter formatter = new HelpFormatter();
     formatter.printHelp("RuntimeManagerMain", options);
   }

   // Construct all required command line options
   private static Options constructOptions() {
     Options options = new Options();

     Option cluster = Option.builder("c")
         .desc("Cluster name in which the topology needs to run on")
         .longOpt("cluster")
         .hasArgs()
         .argName("cluster")
         .required()
         .build();

     Option role = Option.builder("r")
         .desc("Role under which the topology needs to run")
         .longOpt("role")
         .hasArgs()
         .argName("role")
         .required()
         .build();

     Option environment = Option.builder("e")
         .desc("Environment under which the topology needs to run")
         .longOpt("environment")
         .hasArgs()
         .argName("environment")
         .required()
         .build();

     Option submitUser = Option.builder("s")
         .desc("User submitting the topology")
         .longOpt("submit_user")
         .hasArgs()
         .argName("submit userid")
         .required()
         .build();

     Option topologyName = Option.builder("n")
         .desc("Name of the topology")
         .longOpt("topology_name")
         .hasArgs()
         .argName("topology name")
         .required()
         .build();

     Option heronHome = Option.builder("d")
         .desc("Directory where heron is installed")
         .longOpt("heron_home")
         .hasArgs()
         .argName("heron home dir")
         .required()
         .build();

     Option componentParallelism = Option.builder("a")
         .desc("Component parallelism to update: <name>:<value>,<name>:<value>,...")
         .longOpt("component_parallelism")
         .hasArgs()
         .argName("component parallelism")
         .build();

     Option configFile = Option.builder("p")
         .desc("Path of the config files")
         .longOpt("config_path")
         .hasArgs()
         .argName("config path")
         .required()
         .build();

     Option configOverrides = Option.builder("o")
         .desc("Command line override config path")
         .longOpt("override_config_file")
         .hasArgs()
         .argName("override config file")
         .build();

     Option releaseFile = Option.builder("b")
         .desc("Release file name")
         .longOpt("release_file")
         .hasArgs()
         .argName("release information")
         .build();

     Option command = Option.builder("m")
         .desc("Command to run")
         .longOpt("command")
         .hasArgs()
         .required()
         .argName("command to run")
         .build();

     Option containerId = Option.builder("i")
         .desc("Container Id for restart command")
         .longOpt("container_id")
         .hasArgs()
         .argName("container id")
         .build();

     Option dryRun = Option.builder("u")
         .desc("run in dry-run mode")
         .longOpt("dry_run")
         .required(false)
         .build();

     Option dryRunFormat = Option.builder("t")
         .desc("dry-run format")
         .longOpt("dry_run_format")
         .hasArg()
         .required(false)
         .build();

     Option verbose = Option.builder("v")
         .desc("Enable debug logs")
         .longOpt("verbose")
         .build();

     options.addOption(cluster);
     options.addOption(role);
     options.addOption(environment);
     options.addOption(submitUser);
     options.addOption(topologyName);
     options.addOption(configFile);
     options.addOption(configOverrides);
     options.addOption(releaseFile);
     options.addOption(command);
     options.addOption(heronHome);
     options.addOption(containerId);
     options.addOption(componentParallelism);
     options.addOption(dryRun);
     options.addOption(dryRunFormat);
     options.addOption(verbose);

     return options;
   }

   // construct command line help options
   private static Options constructHelpOptions() {
     Options options = new Options();
     Option help = Option.builder("h")
         .desc("List all options and their description")
         .longOpt("help")
         .build();

     options.addOption(help);
     return options;
   }

   public static void main(String[] args)
       throws ClassNotFoundException, IllegalAccessException,
       InstantiationException, IOException, ParseException {

     Options options = constructOptions();
     Options helpOptions = constructHelpOptions();
     CommandLineParser parser = new DefaultParser();
     // parse the help options first.
     CommandLine cmd = parser.parse(helpOptions, args, true);

     if (cmd.hasOption("h")) {
       usage(options);
       return;
     }

     try {
       // Now parse the required options
       cmd = parser.parse(options, args);
     } catch (ParseException e) {
       usage(options);
       throw new RuntimeException("Error parsing command line options: ", e);
     }

     Boolean verbose = false;
     Level logLevel = Level.INFO;
     if (cmd.hasOption("v")) {
       logLevel = Level.ALL;
       verbose = true;
     }

     // init log
     LoggingHelper.loggerInit(logLevel, false);

     String cluster = cmd.getOptionValue("cluster");
     String role = cmd.getOptionValue("role");
     String environ = cmd.getOptionValue("environment");
     String submitUser = cmd.getOptionValue("submit_user");
     String heronHome = cmd.getOptionValue("heron_home");
     String configPath = cmd.getOptionValue("config_path");
     String overrideConfigFile = cmd.getOptionValue("override_config_file");
     String releaseFile = cmd.getOptionValue("release_file");
     String topologyName = cmd.getOptionValue("topology_name");
     String commandOption = cmd.getOptionValue("command");
     String componentParallelism = cmd.getOptionValue("component_parallelism");

     // Optional argument in the case of restart
     // TODO(karthik): convert into CLI
     String containerId = Integer.toString(-1);
     if (cmd.hasOption("container_id")) {
       containerId = cmd.getOptionValue("container_id");
     }

     Boolean dryRun = false;
     if (cmd.hasOption("u")) {
       dryRun = true;
     }

     // Default dry-run output format type
     DryRunFormatType dryRunFormat = DryRunFormatType.TABLE;
     if (dryRun && cmd.hasOption("t")) {
       String format = cmd.getOptionValue("dry_run_format");
       dryRunFormat = DryRunFormatType.getDryRunFormatType(format);
       LOG.fine(String.format("Running dry-run mode using format %s", format));
     }

     Command command = Command.makeCommand(commandOption);

     // add config parameters from the command line
     Config.Builder commandLineConfig = Config.newBuilder()
         .put(Key.CLUSTER, cluster)
         .put(Key.ROLE, role)
         .put(Key.ENVIRON, environ)
         .put(Key.SUBMIT_USER, submitUser)
         .put(Key.DRY_RUN, dryRun)
         .put(Key.DRY_RUN_FORMAT_TYPE, dryRunFormat)
         .put(Key.VERBOSE, verbose)
         .put(Key.TOPOLOGY_CONTAINER_ID, containerId);

     // This is a command line option, but not a valid config key. Hence we don't use Keys
     if (componentParallelism != null) {
       commandLineConfig.put(
           RuntimeManagerRunner.NEW_COMPONENT_PARALLELISM_KEY, componentParallelism);
     }

     Config.Builder topologyConfig = Config.newBuilder()
         .put(Key.TOPOLOGY_NAME, topologyName);

     // build the final config by expanding all the variables
     Config config = Config.toLocalMode(Config.newBuilder()
         .putAll(ConfigLoader.loadConfig(heronHome, configPath, releaseFile, overrideConfigFile))
         .putAll(commandLineConfig.build())
         .putAll(topologyConfig.build())
         .build());

     LOG.fine("Static config loaded successfully ");
     LOG.fine(config.toString());

     /* Meaning of exit status code:
       - status code = 0:
         program exits without error
       - 0 < status code < 100:
         program fails to execute before program execution. For example,
         JVM cannot find or load main class
       - 100 <= status code < 200:
         program fails to launch after program execution. For example,
         topology definition file fails to be loaded
       - status code == 200
         program sends out dry-run response */
     /* Since only stderr is used (by logging), we use stdout here to
        propagate any message back to Python's executor.py (invoke site). */
     // Create a new instance of RuntimeManagerMain
     RuntimeManagerMain runtimeManagerMain = new RuntimeManagerMain(config, command);
     try {
       runtimeManagerMain.manageTopology();
       // SUPPRESS CHECKSTYLE IllegalCatch
     } catch (UpdateDryRunResponse response) {
       LOG.log(Level.FINE, "Sending out dry-run response");
       // Output may contain UTF-8 characters, so we should print using UTF-8 encoding
       PrintStream out = new PrintStream(System.out, true, StandardCharsets.UTF_8.name());
       out.print(DryRunRenders.render(response, Context.dryRunFormatType(config)));
       // SUPPRESS CHECKSTYLE RegexpSinglelineJava
       // Exit with status code 200 to indicate dry-run response is sent out
       System.exit(200);
       // SUPPRESS CHECKSTYLE IllegalCatch
     } catch (Exception e) {
       LOG.log(Level.FINE, "Exception when submitting topology", e);
       System.out.println(e.getMessage());
       // Exit with status code 100 to indicate that error has happened on user-land
       // SUPPRESS CHECKSTYLE RegexpSinglelineJava
       System.exit(100);
     }
   }

   // holds all the config read
   private final Config config;

   // command to manage a topology
   private final Command command;

   public RuntimeManagerMain(
       Config config,
       Command command) {
     // initialize the options
     this.config = config;
     this.command = command;
   }

   /**
    * Manager a topology
    * 1. Instantiate necessary resources
    * 2. Valid whether the runtime management is legal
    * 3. Complete the runtime management for a specific command
    *
    */
   public void manageTopology()
       throws TopologyRuntimeManagementException, TMasterException, PackingException {
     String topologyName = Context.topologyName(config);
     // 1. Do prepare work
     // create an instance of state manager
     String statemgrClass = Context.stateManagerClass(config);
     IStateManager statemgr;
     try {
       statemgr = ReflectionUtils.newInstance(statemgrClass);
     } catch (IllegalAccessException | InstantiationException | ClassNotFoundException e) {
       throw new TopologyRuntimeManagementException(String.format(
           "Failed to instantiate state manager class '%s'",
           statemgrClass), e);
     }

     // Put it in a try block so that we can always clean resources
     try {
       // initialize the statemgr
       statemgr.initialize(config);

       // TODO(mfu): timeout should read from config
       SchedulerStateManagerAdaptor adaptor = new SchedulerStateManagerAdaptor(statemgr, 5000);

       validateRuntimeManage(adaptor, topologyName);

       // 2. Try to manage topology if valid
       // invoke the appropriate command to manage the topology
       LOG.log(Level.FINE, "Topology: {0} to be {1}ed", new Object[]{topologyName, command});

       // build the runtime config
       Config runtime = Config.newBuilder()
           .put(Key.TOPOLOGY_NAME, Context.topologyName(config))
           .put(Key.SCHEDULER_STATE_MANAGER_ADAPTOR, adaptor)
           .build();

       // Create a ISchedulerClient basing on the config
       ISchedulerClient schedulerClient = getSchedulerClient(runtime);

       callRuntimeManagerRunner(runtime, schedulerClient);
     } finally {
       // 3. Do post work basing on the result
       // Currently nothing to do here

       // 4. Close the resources
       SysUtils.closeIgnoringExceptions(statemgr);
     }
   }

   protected void validateRuntimeManage(
       SchedulerStateManagerAdaptor adaptor,
       String topologyName) throws TopologyRuntimeManagementException {
     // Check whether the topology has already been running
     Boolean isTopologyRunning = adaptor.isTopologyRunning(topologyName);

     if (isTopologyRunning == null || isTopologyRunning.equals(Boolean.FALSE)) {
       throw new TopologyRuntimeManagementException(
           String.format("Topology '%s' does not exist", topologyName));
     }

     // Check whether cluster/role/environ matched
     ExecutionEnvironment.ExecutionState executionState = adaptor.getExecutionState(topologyName);
     if (executionState == null) {
       throw new TopologyRuntimeManagementException(
           String.format("Failed to get execution state for topology %s", topologyName));
     }

     String stateCluster = executionState.getCluster();
     String stateRole = executionState.getRole();
     String stateEnv = executionState.getEnviron();
     String configCluster = Context.cluster(config);
     String configRole = Context.role(config);
     String configEnv = Context.environ(config);
     if (!stateCluster.equals(configCluster)
         || !stateRole.equals(configRole)
         || !stateEnv.equals(configEnv)) {
       String currentState = String.format("%s/%s/%s", stateCluster, stateRole, stateEnv);
       String configState = String.format("%s/%s/%s", configCluster, configRole, configEnv);
       throw new TopologyRuntimeManagementException(String.format(
           "cluster/role/environ does not match. Topology '%s' is running at %s, not %s",
           topologyName, currentState, configState));
     }
   }

   protected void callRuntimeManagerRunner(Config runtime, ISchedulerClient schedulerClient)
     throws TopologyRuntimeManagementException, TMasterException, PackingException {
     // create an instance of the runner class
     RuntimeManagerRunner runtimeManagerRunner =
         new RuntimeManagerRunner(config, runtime, command, schedulerClient);

     // invoke the appropriate handlers based on command
     runtimeManagerRunner.call();
   }

   protected ISchedulerClient getSchedulerClient(Config runtime)
       throws SchedulerException {
     return new SchedulerClientFactory(config, runtime).getSchedulerClient();
   }
 }
	// Copyright 2016 Twitter. All rights reserved.
	//
	// Licensed 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 com.twitter.heron.scheduler;

	import java.io.IOException;
	import java.io.PrintStream;
	import java.nio.charset.StandardCharsets;
	import java.util.logging.Level;
	import java.util.logging.Logger;

	import org.apache.commons.cli.CommandLine;
	import org.apache.commons.cli.CommandLineParser;
	import org.apache.commons.cli.DefaultParser;
	import org.apache.commons.cli.HelpFormatter;
	import org.apache.commons.cli.Option;
	import org.apache.commons.cli.Options;
	import org.apache.commons.cli.ParseException;

	import com.twitter.heron.common.basics.DryRunFormatType;
	import com.twitter.heron.common.basics.SysUtils;
	import com.twitter.heron.common.utils.logging.LoggingHelper;
	import com.twitter.heron.proto.system.ExecutionEnvironment;
	import com.twitter.heron.scheduler.client.ISchedulerClient;
	import com.twitter.heron.scheduler.client.SchedulerClientFactory;
	import com.twitter.heron.scheduler.dryrun.UpdateDryRunResponse;
	import com.twitter.heron.scheduler.utils.DryRunRenders;
	import com.twitter.heron.spi.common.Config;
	import com.twitter.heron.spi.common.ConfigLoader;
	import com.twitter.heron.spi.common.Context;
	import com.twitter.heron.spi.common.Key;
	import com.twitter.heron.spi.packing.PackingException;
	import com.twitter.heron.spi.scheduler.SchedulerException;
	import com.twitter.heron.spi.statemgr.IStateManager;
	import com.twitter.heron.spi.statemgr.SchedulerStateManagerAdaptor;
	import com.twitter.heron.spi.utils.ReflectionUtils;
	import com.twitter.heron.spi.utils.TMasterException;

	public class RuntimeManagerMain {
	private static final Logger LOG = Logger.getLogger(RuntimeManagerMain.class.getName());

	// Print usage options
	private static void usage(Options options) {
	HelpFormatter formatter = new HelpFormatter();
	formatter.printHelp("RuntimeManagerMain", options);
	}

	// Construct all required command line options
	private static Options constructOptions() {
	Options options = new Options();

	Option cluster = Option.builder("c")
	.desc("Cluster name in which the topology needs to run on")
	.longOpt("cluster")
	.hasArgs()
	.argName("cluster")
	.required()
	.build();

	Option role = Option.builder("r")
	.desc("Role under which the topology needs to run")
	.longOpt("role")
	.hasArgs()
	.argName("role")
	.required()
	.build();

	Option environment = Option.builder("e")
	.desc("Environment under which the topology needs to run")
	.longOpt("environment")
	.hasArgs()
	.argName("environment")
	.required()
	.build();

	Option submitUser = Option.builder("s")
	.desc("User submitting the topology")
	.longOpt("submit_user")
	.hasArgs()
	.argName("submit userid")
	.required()
	.build();

	Option topologyName = Option.builder("n")
	.desc("Name of the topology")
	.longOpt("topology_name")
	.hasArgs()
	.argName("topology name")
	.required()
	.build();

	Option heronHome = Option.builder("d")
	.desc("Directory where heron is installed")
	.longOpt("heron_home")
	.hasArgs()
	.argName("heron home dir")
	.required()
	.build();

	Option componentParallelism = Option.builder("a")
	.desc("Component parallelism to update: <name>:<value>,<name>:<value>,...")
	.longOpt("component_parallelism")
	.hasArgs()
	.argName("component parallelism")
	.build();

	Option configFile = Option.builder("p")
	.desc("Path of the config files")
	.longOpt("config_path")
	.hasArgs()
	.argName("config path")
	.required()
	.build();

	Option configOverrides = Option.builder("o")
	.desc("Command line override config path")
	.longOpt("override_config_file")
	.hasArgs()
	.argName("override config file")
	.build();

	Option releaseFile = Option.builder("b")
	.desc("Release file name")
	.longOpt("release_file")
	.hasArgs()
	.argName("release information")
	.build();

	Option command = Option.builder("m")
	.desc("Command to run")
	.longOpt("command")
	.hasArgs()
	.required()
	.argName("command to run")
	.build();

	Option containerId = Option.builder("i")
	.desc("Container Id for restart command")
	.longOpt("container_id")
	.hasArgs()
	.argName("container id")
	.build();

	Option dryRun = Option.builder("u")
	.desc("run in dry-run mode")
	.longOpt("dry_run")
	.required(false)
	.build();

	Option dryRunFormat = Option.builder("t")
	.desc("dry-run format")
	.longOpt("dry_run_format")
	.hasArg()
	.required(false)
	.build();

	Option verbose = Option.builder("v")
	.desc("Enable debug logs")
	.longOpt("verbose")
	.build();

	options.addOption(cluster);
	options.addOption(role);
	options.addOption(environment);
	options.addOption(submitUser);
	options.addOption(topologyName);
	options.addOption(configFile);
	options.addOption(configOverrides);
	options.addOption(releaseFile);
	options.addOption(command);
	options.addOption(heronHome);
	options.addOption(containerId);
	options.addOption(componentParallelism);
	options.addOption(dryRun);
	options.addOption(dryRunFormat);
	options.addOption(verbose);

	return options;
	}

	// construct command line help options
	private static Options constructHelpOptions() {
	Options options = new Options();
	Option help = Option.builder("h")
	.desc("List all options and their description")
	.longOpt("help")
	.build();

	options.addOption(help);
	return options;
	}

	public static void main(String[] args)
	throws ClassNotFoundException, IllegalAccessException,
	InstantiationException, IOException, ParseException {

	Options options = constructOptions();
	Options helpOptions = constructHelpOptions();
	CommandLineParser parser = new DefaultParser();
	// parse the help options first.
	CommandLine cmd = parser.parse(helpOptions, args, true);

	if (cmd.hasOption("h")) {
	usage(options);
	return;
	}

	try {
	// Now parse the required options
	cmd = parser.parse(options, args);
	} catch (ParseException e) {
	usage(options);
	throw new RuntimeException("Error parsing command line options: ", e);
	}

	Boolean verbose = false;
	Level logLevel = Level.INFO;
	if (cmd.hasOption("v")) {
	logLevel = Level.ALL;
	verbose = true;
	}

	// init log
	LoggingHelper.loggerInit(logLevel, false);

	String cluster = cmd.getOptionValue("cluster");
	String role = cmd.getOptionValue("role");
	String environ = cmd.getOptionValue("environment");
	String submitUser = cmd.getOptionValue("submit_user");
	String heronHome = cmd.getOptionValue("heron_home");
	String configPath = cmd.getOptionValue("config_path");
	String overrideConfigFile = cmd.getOptionValue("override_config_file");
	String releaseFile = cmd.getOptionValue("release_file");
	String topologyName = cmd.getOptionValue("topology_name");
	String commandOption = cmd.getOptionValue("command");
	String componentParallelism = cmd.getOptionValue("component_parallelism");

	// Optional argument in the case of restart
	// TODO(karthik): convert into CLI
	String containerId = Integer.toString(-1);
	if (cmd.hasOption("container_id")) {
	containerId = cmd.getOptionValue("container_id");
	}

	Boolean dryRun = false;
	if (cmd.hasOption("u")) {
	dryRun = true;
	}

	// Default dry-run output format type
	DryRunFormatType dryRunFormat = DryRunFormatType.TABLE;
	if (dryRun && cmd.hasOption("t")) {
	String format = cmd.getOptionValue("dry_run_format");
	dryRunFormat = DryRunFormatType.getDryRunFormatType(format);
	LOG.fine(String.format("Running dry-run mode using format %s", format));
	}

	Command command = Command.makeCommand(commandOption);

	// add config parameters from the command line
	Config.Builder commandLineConfig = Config.newBuilder()
	.put(Key.CLUSTER, cluster)
	.put(Key.ROLE, role)
	.put(Key.ENVIRON, environ)
	.put(Key.SUBMIT_USER, submitUser)
	.put(Key.DRY_RUN, dryRun)
	.put(Key.DRY_RUN_FORMAT_TYPE, dryRunFormat)
	.put(Key.VERBOSE, verbose)
	.put(Key.TOPOLOGY_CONTAINER_ID, containerId);

	// This is a command line option, but not a valid config key. Hence we don't use Keys
	if (componentParallelism != null) {
	commandLineConfig.put(
	RuntimeManagerRunner.NEW_COMPONENT_PARALLELISM_KEY, componentParallelism);
	}

	Config.Builder topologyConfig = Config.newBuilder()
	.put(Key.TOPOLOGY_NAME, topologyName);

	// build the final config by expanding all the variables
	Config config = Config.toLocalMode(Config.newBuilder()
	.putAll(ConfigLoader.loadConfig(heronHome, configPath, releaseFile, overrideConfigFile))
	.putAll(commandLineConfig.build())
	.putAll(topologyConfig.build())
	.build());

	LOG.fine("Static config loaded successfully ");
	LOG.fine(config.toString());

	/* Meaning of exit status code:
	- status code = 0:
	program exits without error
	- 0 < status code < 100:
	program fails to execute before program execution. For example,
	JVM cannot find or load main class
	- 100 <= status code < 200:
	program fails to launch after program execution. For example,
	topology definition file fails to be loaded
	- status code == 200
	program sends out dry-run response */
	/* Since only stderr is used (by logging), we use stdout here to
	propagate any message back to Python's executor.py (invoke site). */
	// Create a new instance of RuntimeManagerMain
	RuntimeManagerMain runtimeManagerMain = new RuntimeManagerMain(config, command);
	try {
	runtimeManagerMain.manageTopology();
	// SUPPRESS CHECKSTYLE IllegalCatch
	} catch (UpdateDryRunResponse response) {
	LOG.log(Level.FINE, "Sending out dry-run response");
	// Output may contain UTF-8 characters, so we should print using UTF-8 encoding
	PrintStream out = new PrintStream(System.out, true, StandardCharsets.UTF_8.name());
	out.print(DryRunRenders.render(response, Context.dryRunFormatType(config)));
	// SUPPRESS CHECKSTYLE RegexpSinglelineJava
	// Exit with status code 200 to indicate dry-run response is sent out
	System.exit(200);
	// SUPPRESS CHECKSTYLE IllegalCatch
	} catch (Exception e) {
	LOG.log(Level.FINE, "Exception when submitting topology", e);
	System.out.println(e.getMessage());
	// Exit with status code 100 to indicate that error has happened on user-land
	// SUPPRESS CHECKSTYLE RegexpSinglelineJava
	System.exit(100);
	}
	}

	// holds all the config read
	private final Config config;

	// command to manage a topology
	private final Command command;

	public RuntimeManagerMain(
	Config config,
	Command command) {
	// initialize the options
	this.config = config;
	this.command = command;
	}

	/**
	* Manager a topology
	* 1. Instantiate necessary resources
	* 2. Valid whether the runtime management is legal
	* 3. Complete the runtime management for a specific command
	*
	*/
	public void manageTopology()
	throws TopologyRuntimeManagementException, TMasterException, PackingException {
	String topologyName = Context.topologyName(config);
	// 1. Do prepare work
	// create an instance of state manager
	String statemgrClass = Context.stateManagerClass(config);
	IStateManager statemgr;
	try {
	statemgr = ReflectionUtils.newInstance(statemgrClass);
	} catch (IllegalAccessException \| InstantiationException \| ClassNotFoundException e) {
	throw new TopologyRuntimeManagementException(String.format(
	"Failed to instantiate state manager class '%s'",
	statemgrClass), e);
	}

	// Put it in a try block so that we can always clean resources
	try {
	// initialize the statemgr
	statemgr.initialize(config);

	// TODO(mfu): timeout should read from config
	SchedulerStateManagerAdaptor adaptor = new SchedulerStateManagerAdaptor(statemgr, 5000);

	validateRuntimeManage(adaptor, topologyName);

	// 2. Try to manage topology if valid
	// invoke the appropriate command to manage the topology
	LOG.log(Level.FINE, "Topology: {0} to be {1}ed", new Object[]{topologyName, command});

	// build the runtime config
	Config runtime = Config.newBuilder()
	.put(Key.TOPOLOGY_NAME, Context.topologyName(config))
	.put(Key.SCHEDULER_STATE_MANAGER_ADAPTOR, adaptor)
	.build();

	// Create a ISchedulerClient basing on the config
	ISchedulerClient schedulerClient = getSchedulerClient(runtime);

	callRuntimeManagerRunner(runtime, schedulerClient);
	} finally {
	// 3. Do post work basing on the result
	// Currently nothing to do here

	// 4. Close the resources
	SysUtils.closeIgnoringExceptions(statemgr);
	}
	}

	protected void validateRuntimeManage(
	SchedulerStateManagerAdaptor adaptor,
	String topologyName) throws TopologyRuntimeManagementException {
	// Check whether the topology has already been running
	Boolean isTopologyRunning = adaptor.isTopologyRunning(topologyName);

	if (isTopologyRunning == null \|\| isTopologyRunning.equals(Boolean.FALSE)) {
	throw new TopologyRuntimeManagementException(
	String.format("Topology '%s' does not exist", topologyName));
	}

	// Check whether cluster/role/environ matched
	ExecutionEnvironment.ExecutionState executionState = adaptor.getExecutionState(topologyName);
	if (executionState == null) {
	throw new TopologyRuntimeManagementException(
	String.format("Failed to get execution state for topology %s", topologyName));
	}

	String stateCluster = executionState.getCluster();
	String stateRole = executionState.getRole();
	String stateEnv = executionState.getEnviron();
	String configCluster = Context.cluster(config);
	String configRole = Context.role(config);
	String configEnv = Context.environ(config);
	if (!stateCluster.equals(configCluster)
	\|\| !stateRole.equals(configRole)
	\|\| !stateEnv.equals(configEnv)) {
	String currentState = String.format("%s/%s/%s", stateCluster, stateRole, stateEnv);
	String configState = String.format("%s/%s/%s", configCluster, configRole, configEnv);
	throw new TopologyRuntimeManagementException(String.format(
	"cluster/role/environ does not match. Topology '%s' is running at %s, not %s",
	topologyName, currentState, configState));
	}
	}

	protected void callRuntimeManagerRunner(Config runtime, ISchedulerClient schedulerClient)
	throws TopologyRuntimeManagementException, TMasterException, PackingException {
	// create an instance of the runner class
	RuntimeManagerRunner runtimeManagerRunner =
	new RuntimeManagerRunner(config, runtime, command, schedulerClient);

	// invoke the appropriate handlers based on command
	runtimeManagerRunner.call();
	}

	protected ISchedulerClient getSchedulerClient(Config runtime)
	throws SchedulerException {
	return new SchedulerClientFactory(config, runtime).getSchedulerClient();
	}
	}