/*
 * 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.storm;

import static org.apache.storm.validation.ConfigValidationAnnotations.IsBoolean;
import static org.apache.storm.validation.ConfigValidationAnnotations.IsImplementationOfClass;
import static org.apache.storm.validation.ConfigValidationAnnotations.IsInteger;
import static org.apache.storm.validation.ConfigValidationAnnotations.IsListEntryCustom;
import static org.apache.storm.validation.ConfigValidationAnnotations.IsMapEntryCustom;
import static org.apache.storm.validation.ConfigValidationAnnotations.IsMapEntryType;
import static org.apache.storm.validation.ConfigValidationAnnotations.IsNoDuplicateInList;
import static org.apache.storm.validation.ConfigValidationAnnotations.IsNumber;
import static org.apache.storm.validation.ConfigValidationAnnotations.IsPositiveNumber;
import static org.apache.storm.validation.ConfigValidationAnnotations.IsString;
import static org.apache.storm.validation.ConfigValidationAnnotations.IsStringList;
import static org.apache.storm.validation.ConfigValidationAnnotations.IsStringOrStringList;
import static org.apache.storm.validation.ConfigValidationAnnotations.NotNull;
import static org.apache.storm.validation.ConfigValidationAnnotations.Password;

import java.util.ArrayList;
import java.util.Map;
import org.apache.storm.container.ResourceIsolationInterface;
import org.apache.storm.nimbus.ITopologyActionNotifierPlugin;
import org.apache.storm.scheduler.blacklist.reporters.IReporter;
import org.apache.storm.scheduler.blacklist.strategies.IBlacklistStrategy;
import org.apache.storm.scheduler.resource.strategies.priority.ISchedulingPriorityStrategy;
import org.apache.storm.scheduler.resource.strategies.scheduling.IStrategy;
import org.apache.storm.security.auth.IAuthorizer;
import org.apache.storm.security.auth.IHttpCredentialsPlugin;
import org.apache.storm.validation.ConfigValidation;
import org.apache.storm.validation.Validated;

/**
 * Storm configs are specified as a plain old map. This class provides constants for all the configurations possible on a Storm cluster.
 * Each constant is paired with an annotation that defines the validity criterion of the corresponding field. Default values for these
 * configs can be found in defaults.yaml.
 *
 * <p>This class extends {@link org.apache.storm.Config} for supporting Storm Daemons.
 */
public class DaemonConfig implements Validated {

    /**
     * We check with this interval that whether the Netty channel is writable and try to write pending messages.
     */
    @IsInteger
    public static final String STORM_NETTY_FLUSH_CHECK_INTERVAL_MS = "storm.messaging.netty.flush.check.interval.ms";

    /**
     * A list of daemon metrics  reporter plugin class names. These plugins must implement {@link
     * org.apache.storm.daemon.metrics.reporters.PreparableReporter} interface.
     */
    @IsStringList
    public static final String STORM_DAEMON_METRICS_REPORTER_PLUGINS = "storm.daemon.metrics.reporter.plugins";

    /**
     * A specify domain for daemon metrics reporter plugin to limit reporting to specific domain.
     */
    @IsString
    public static final String STORM_DAEMON_METRICS_REPORTER_PLUGIN_DOMAIN = "storm.daemon.metrics.reporter.plugin.domain";

    /**
     * A specify csv reporter directory for CvsPreparableReporter daemon metrics reporter.
     */
    @IsString
    public static final String STORM_DAEMON_METRICS_REPORTER_CSV_LOG_DIR = "storm.daemon.metrics.reporter.csv.log.dir";

    /**
     * A directory that holds configuration files for log4j2. It can be either a relative or an absolute directory. If relative, it is
     * relative to the storm's home directory.
     */
    @IsString
    public static final String STORM_LOG4J2_CONF_DIR = "storm.log4j2.conf.dir";

    /**
     * A global task scheduler used to assign topologies's tasks to supervisors' workers.
     *
     * <p>If this is not set, a default system scheduler will be used.
     */
    @IsString
    public static final String STORM_SCHEDULER = "storm.scheduler";

    /**
     * Max time to attempt to schedule one topology. The default is 60 seconds
     */
    @IsInteger
    @IsPositiveNumber
    public static final String SCHEDULING_TIMEOUT_SECONDS_PER_TOPOLOGY = "scheduling.timeout.seconds.per.topology";

    /**
     * The number of seconds that the blacklist scheduler will concern of bad slots or supervisors.
     */
    @IsPositiveNumber
    public static final String BLACKLIST_SCHEDULER_TOLERANCE_TIME = "blacklist.scheduler.tolerance.time.secs";

    /**
     * The number of hit count that will trigger blacklist in tolerance time.
     */
    @IsPositiveNumber
    public static final String BLACKLIST_SCHEDULER_TOLERANCE_COUNT = "blacklist.scheduler.tolerance.count";

    /**
     * The number of seconds that the blacklisted slots or supervisor will be resumed.
     */
    @IsPositiveNumber
    public static final String BLACKLIST_SCHEDULER_RESUME_TIME = "blacklist.scheduler.resume.time.secs";

    /**
     * The class that the blacklist scheduler will report the blacklist.
     */
    @NotNull
    @IsImplementationOfClass(implementsClass = IReporter.class)
    public static final String BLACKLIST_SCHEDULER_REPORTER = "blacklist.scheduler.reporter";

    /**
     * The class that specifies the eviction strategy to use in blacklist scheduler.
     * If you are using the RAS scheduler please set this to
     * "org.apache.storm.scheduler.blacklist.strategies.RasBlacklistStrategy" or you may
     * get odd behavior when the cluster is full and there are blacklisted nodes.
     */
    @NotNull
    @IsImplementationOfClass(implementsClass = IBlacklistStrategy.class)
    public static final String BLACKLIST_SCHEDULER_STRATEGY = "blacklist.scheduler.strategy";

    /**
     * Whether {@link org.apache.storm.scheduler.blacklist.BlacklistScheduler} will assume the supervisor is bad
     * based on bad slots or not.
     * A bad slot indicates the situation where the nimbus doesn't receive heartbeat from the worker in time,
     * it's hard to differentiate if it's because of the supervisor node or the worker itself.
     * If this is set to true, the scheduler will consider a supervisor is bad when seeing bad slots in it.
     * Otherwise, the scheduler will assume a supervisor is bad only when it does not receive supervisor heartbeat in time.
     */
    @IsBoolean
    public static final String BLACKLIST_SCHEDULER_ASSUME_SUPERVISOR_BAD_BASED_ON_BAD_SLOT
            = "blacklist.scheduler.assume.supervisor.bad.based.on.bad.slot";

    /**
     * Whether we want to display all the resource capacity and scheduled usage on the UI page. You MUST have this variable set if you are
     * using any kind of resource-related scheduler.
     * <p/>
     * If this is not set, we will not display resource capacity and usage on the UI.
     */
    @IsBoolean
    public static final String SCHEDULER_DISPLAY_RESOURCE = "scheduler.display.resource";

    /**
     * The directory where storm's health scripts go.
     */
    @IsString
    public static final String STORM_HEALTH_CHECK_DIR = "storm.health.check.dir";

    /**
     * The time to allow any given healthcheck script to run before it is marked failed due to timeout.
     */
    @IsNumber
    public static final String STORM_HEALTH_CHECK_TIMEOUT_MS = "storm.health.check.timeout.ms";

    /**
     * This is the user that the Nimbus daemon process is running as. May be used when security is enabled to authorize actions in the
     * cluster.
     */
    @IsString
    public static final String NIMBUS_DAEMON_USER = "nimbus.daemon.user";

    /**
     * This parameter is used by the storm-deploy project to configure the jvm options for the nimbus daemon.
     */
    @IsStringOrStringList
    public static final String NIMBUS_CHILDOPTS = "nimbus.childopts";


    /**
     * How long without heartbeating a task can go before nimbus will consider the task dead and reassign it to another location.
     * Can be exceeded when {@link Config#TOPOLOGY_WORKER_TIMEOUT_SECS} is set.
     */
    @IsInteger
    @IsPositiveNumber
    public static final String NIMBUS_TASK_TIMEOUT_SECS = "nimbus.task.timeout.secs";

    /**
     * How often nimbus should wake up to check heartbeats and do reassignments. Note that if a machine ever goes down Nimbus will
     * immediately wake up and take action. This parameter is for checking for failures when there's no explicit event like that occurring.
     */
    @IsInteger
    @IsPositiveNumber
    public static final String NIMBUS_MONITOR_FREQ_SECS = "nimbus.monitor.freq.secs";

    /**
     * How often nimbus should wake the cleanup thread to clean the inbox.
     *
     * @see #NIMBUS_INBOX_JAR_EXPIRATION_SECS
     */
    @IsInteger
    @IsPositiveNumber
    public static final String NIMBUS_CLEANUP_INBOX_FREQ_SECS = "nimbus.cleanup.inbox.freq.secs";

    /**
     * The length of time a jar file lives in the inbox before being deleted by the cleanup thread.
     *
     * <p>Probably keep this value greater than or equal to NIMBUS_CLEANUP_INBOX_JAR_EXPIRATION_SECS. Note that the time
     * it takes to delete an inbox jar file is going to be somewhat more than NIMBUS_CLEANUP_INBOX_JAR_EXPIRATION_SECS
     * (depending on how often NIMBUS_CLEANUP_FREQ_SECS is set to).
     *
     * @see #NIMBUS_CLEANUP_INBOX_FREQ_SECS
     */
    @IsInteger
    public static final String NIMBUS_INBOX_JAR_EXPIRATION_SECS = "nimbus.inbox.jar.expiration.secs";

    /**
     * How long before a supervisor can go without heartbeating before nimbus considers it dead and stops assigning new work to it.
     */
    @IsInteger
    @IsPositiveNumber
    public static final String NIMBUS_SUPERVISOR_TIMEOUT_SECS = "nimbus.supervisor.timeout.secs";

    /**
     * A special timeout used when a task is initially launched. During launch, this is the timeout used until the first heartbeat,
     * overriding nimbus.task.timeout.secs.
     *
     * <p>A separate timeout exists for launch because there can be quite a bit of overhead
     * to launching new JVM's and configuring them.</p>
     * Can be exceeded when {@link Config#TOPOLOGY_WORKER_TIMEOUT_SECS} is set.
     */
    @IsInteger
    @IsPositiveNumber
    public static final String NIMBUS_TASK_LAUNCH_SECS = "nimbus.task.launch.secs";

    /**
     * During upload/download with the master, how long an upload or download connection is idle before nimbus considers it dead and drops
     * the connection.
     */
    @IsInteger
    public static final String NIMBUS_FILE_COPY_EXPIRATION_SECS = "nimbus.file.copy.expiration.secs";

    /**
     * A custom class that implements ITopologyValidator that is run whenever a topology is submitted. Can be used to provide
     * business-specific logic for whether topologies are allowed to run or not.
     */
    @IsString
    public static final String NIMBUS_TOPOLOGY_VALIDATOR = "nimbus.topology.validator";

    /**
     * Class name for authorization plugin for Nimbus.
     */
    @IsString
    public static final String NIMBUS_AUTHORIZER = "nimbus.authorizer";

    /**
     * Class name for authorization plugin for supervisor.
     */
    @IsImplementationOfClass(implementsClass = IAuthorizer.class)
    @IsString
    public static final String SUPERVISOR_AUTHORIZER = "supervisor.authorizer";

    /**
     * Impersonation user ACL config entries.
     */
    @IsString
    public static final String NIMBUS_IMPERSONATION_AUTHORIZER = "nimbus.impersonation.authorizer";

    /**
     * How often nimbus should wake up to renew credentials if needed.
     */
    @IsInteger
    @IsPositiveNumber
    public static final String NIMBUS_CREDENTIAL_RENEW_FREQ_SECS = "nimbus.credential.renewers.freq.secs";

    /**
     * FQCN of a class that implements {@code I} @see org.apache.storm.nimbus.ITopologyActionNotifierPlugin for details.
     */
    @IsImplementationOfClass(implementsClass = ITopologyActionNotifierPlugin.class)
    public static final String NIMBUS_TOPOLOGY_ACTION_NOTIFIER_PLUGIN = "nimbus.topology.action.notifier.plugin.class";

    /**
     * This controls the number of working threads for distributing master assignments to supervisors.
     */
    @IsInteger
    public static final String NIMBUS_ASSIGNMENTS_SERVICE_THREADS = "nimbus.assignments.service.threads";

    /**
     * This controls the number of working thread queue size of assignment service.
     */
    @IsInteger
    public static final String NIMBUS_ASSIGNMENTS_SERVICE_THREAD_QUEUE_SIZE = "nimbus.assignments.service.thread.queue.size";

    /**
     * class controls heartbeats recovery strategy.
     */
    @IsString
    public static final String NIMBUS_WORKER_HEARTBEATS_RECOVERY_STRATEGY_CLASS = "nimbus.worker.heartbeats.recovery.strategy.class";

    /**
     * This controls the number of milliseconds nimbus will wait before deleting a topology blobstore once detected it is able to delete.
     */
    @IsInteger
    public static final String NIMBUS_TOPOLOGY_BLOBSTORE_DELETION_DELAY_MS = "nimbus.topology.blobstore.deletion.delay.ms";

    /**
     * Storm UI binds to this host/interface.
     */
    @IsString
    public static final String UI_HOST = "ui.host";

    /**
     * Storm UI binds to this port.
     */
    @IsInteger
    @IsPositiveNumber
    public static final String UI_PORT = "ui.port";

    /**
     * This controls wheather Storm UI should bind to http port even if ui.port is > 0.
     */
    @IsBoolean
    public static final String UI_DISABLE_HTTP_BINDING = "ui.disable.http.binding";

    /**
     * This controls whether Storm UI displays spout lag for the Kafka spout.
     */
    @IsBoolean
    public static final String UI_DISABLE_SPOUT_LAG_MONITORING = "ui.disable.spout.lag.monitoring";

    /**
     * This controls wheather Storm Logviewer should bind to http port even if logviewer.port is > 0.
     */
    @IsBoolean
    public static final String LOGVIEWER_DISABLE_HTTP_BINDING = "logviewer.disable.http.binding";

    /**
     * This controls wheather Storm DRPC should bind to http port even if drpc.http.port is > 0.
     */
    @IsBoolean
    public static final String DRPC_DISABLE_HTTP_BINDING = "drpc.disable.http.binding";

    /**
     * Storm UI Project BUGTRACKER Link for reporting issue.
     */
    @IsString
    public static final String UI_PROJECT_BUGTRACKER_URL = "ui.project.bugtracker.url";

    /**
     * Storm UI Central Logging URL.
     */
    @IsString
    public static final String UI_CENTRAL_LOGGING_URL = "ui.central.logging.url";

    /**
     * Storm UI drop-down pagination value. Set ui.pagination to be a positive integer or -1 (displays all entries). Valid values: -1, 10,
     * 20, 25 etc.
     */
    @IsInteger
    public static final String UI_PAGINATION = "ui.pagination";

    /**
     * HTTP UI port for log viewer.
     */
    @IsInteger
    @IsPositiveNumber
    public static final String LOGVIEWER_PORT = "logviewer.port";

    /**
     * Childopts for log viewer java process.
     */
    @IsStringOrStringList
    public static final String LOGVIEWER_CHILDOPTS = "logviewer.childopts";

    /**
     * How often to clean up old log files.
     */
    @IsInteger
    @IsPositiveNumber
    public static final String LOGVIEWER_CLEANUP_INTERVAL_SECS = "logviewer.cleanup.interval.secs";

    /**
     * How many minutes since a log was last modified for the log to be considered for clean-up.
     */
    @IsInteger
    @IsPositiveNumber
    public static final String LOGVIEWER_CLEANUP_AGE_MINS = "logviewer.cleanup.age.mins";

    /**
     * The maximum number of bytes all worker log files can take up in MB.
     */
    @IsPositiveNumber
    public static final String LOGVIEWER_MAX_SUM_WORKER_LOGS_SIZE_MB = "logviewer.max.sum.worker.logs.size.mb";

    /**
     * The maximum number of bytes per worker's files can take up in MB.
     */
    @IsPositiveNumber
    public static final String LOGVIEWER_MAX_PER_WORKER_LOGS_SIZE_MB = "logviewer.max.per.worker.logs.size.mb";

    /**
     * Storm Logviewer HTTPS port. Logviewer must use HTTPS if Storm UI is using HTTPS.
     */
    @IsInteger
    @IsPositiveNumber
    public static final String LOGVIEWER_HTTPS_PORT = "logviewer.https.port";

    /**
     * Path to the keystore containing the certs used by Storm Logviewer for HTTPS communications.
     */
    @IsString
    public static final String LOGVIEWER_HTTPS_KEYSTORE_PATH = "logviewer.https.keystore.path";

    /**
     * Password for the keystore for HTTPS for Storm Logviewer.
     */
    @IsString
    @Password
    public static final String LOGVIEWER_HTTPS_KEYSTORE_PASSWORD = "logviewer.https.keystore.password";

    /**
     * Type of the keystore for HTTPS for Storm Logviewer. see http://docs.oracle.com/javase/8/docs/api/java/security/KeyStore.html for more
     * details.
     */
    @IsString
    public static final String LOGVIEWER_HTTPS_KEYSTORE_TYPE = "logviewer.https.keystore.type";

    /**
     * Password to the private key in the keystore for setting up HTTPS (SSL).
     */
    @IsString
    @Password
    public static final String LOGVIEWER_HTTPS_KEY_PASSWORD = "logviewer.https.key.password";

    /**
     * Path to the truststore containing the certs used by Storm Logviewer for HTTPS communications.
     */
    @IsString
    public static final String LOGVIEWER_HTTPS_TRUSTSTORE_PATH = "logviewer.https.truststore.path";

    /**
     * Password for the truststore for HTTPS for Storm Logviewer.
     */
    @IsString
    @Password
    public static final String LOGVIEWER_HTTPS_TRUSTSTORE_PASSWORD = "logviewer.https.truststore.password";

    /**
     * Type of the truststore for HTTPS for Storm Logviewer. see http://docs.oracle.com/javase/8/docs/api/java/security/Truststore.html for
     * more details.
     */
    @IsString
    public static final String LOGVIEWER_HTTPS_TRUSTSTORE_TYPE = "logviewer.https.truststore.type";

    /**
     * Password to the truststore used by Storm Logviewer setting up HTTPS (SSL).
     */
    @IsBoolean
    public static final String LOGVIEWER_HTTPS_WANT_CLIENT_AUTH = "logviewer.https.want.client.auth";

    @IsBoolean
    public static final String LOGVIEWER_HTTPS_NEED_CLIENT_AUTH = "logviewer.https.need.client.auth";

    /**
     * A list of users allowed to view logs via the Log Viewer.
     */
    @IsStringList
    public static final String LOGS_USERS = "logs.users";

    /**
     * A list of groups allowed to view logs via the Log Viewer.
     */
    @IsStringList
    public static final String LOGS_GROUPS = "logs.groups";

    /**
     * Appender name used by log viewer to determine log directory.
     */
    @IsString
    public static final String LOGVIEWER_APPENDER_NAME = "logviewer.appender.name";

    /**
     * A class implementing javax.servlet.Filter for authenticating/filtering Logviewer requests.
     */
    @IsString
    public static final String LOGVIEWER_FILTER = "logviewer.filter";

    /**
     * Initialization parameters for the javax.servlet.Filter for Logviewer.
     */
    @IsMapEntryType(keyType = String.class, valueType = String.class)
    public static final String LOGVIEWER_FILTER_PARAMS = "logviewer.filter.params";

    /**
     * Childopts for Storm UI Java process.
     */
    @IsStringOrStringList
    public static final String UI_CHILDOPTS = "ui.childopts";

    /**
     * A class implementing javax.servlet.Filter for authenticating/filtering UI requests.
     */
    @IsString
    public static final String UI_FILTER = "ui.filter";

    /**
     * Initialization parameters for the javax.servlet.Filter for UI.
     */
    @IsMapEntryType(keyType = String.class, valueType = String.class)
    public static final String UI_FILTER_PARAMS = "ui.filter.params";

    /**
     * The size of the header buffer for the UI in bytes.
     */
    @IsInteger
    @IsPositiveNumber
    public static final String UI_HEADER_BUFFER_BYTES = "ui.header.buffer.bytes";

    /**
     * This port is used by Storm UI for receiving HTTPS (SSL) requests from clients.
     */
    @IsInteger
    @IsPositiveNumber
    public static final String UI_HTTPS_PORT = "ui.https.port";

    /**
     * Path to the keystore used by Storm UI for setting up HTTPS (SSL).
     */
    @IsString
    public static final String UI_HTTPS_KEYSTORE_PATH = "ui.https.keystore.path";

    /**
     * Password to the keystore used by Storm UI for setting up HTTPS (SSL).
     */
    @IsString
    @Password
    public static final String UI_HTTPS_KEYSTORE_PASSWORD = "ui.https.keystore.password";

    /**
     * Type of keystore used by Storm UI for setting up HTTPS (SSL). see http://docs.oracle.com/javase/7/docs/api/java/security/KeyStore
     * .html
     * for more details.
     */
    @IsString
    public static final String UI_HTTPS_KEYSTORE_TYPE = "ui.https.keystore.type";

    /**
     * Password to the private key in the keystore for setting up HTTPS (SSL).
     */
    @IsString
    @Password
    public static final String UI_HTTPS_KEY_PASSWORD = "ui.https.key.password";

    /**
     * Path to the truststore used by Storm UI setting up HTTPS (SSL).
     */
    @IsString
    public static final String UI_HTTPS_TRUSTSTORE_PATH = "ui.https.truststore.path";

    /**
     * Password to the truststore used by Storm UI setting up HTTPS (SSL).
     */
    @IsString
    @Password
    public static final String UI_HTTPS_TRUSTSTORE_PASSWORD = "ui.https.truststore.password";

    /**
     * Type of truststore used by Storm UI for setting up HTTPS (SSL). see http://docs.oracle
     * .com/javase/7/docs/api/java/security/KeyStore.html
     * for more details.
     */
    @IsString
    public static final String UI_HTTPS_TRUSTSTORE_TYPE = "ui.https.truststore.type";

    /**
     * Password to the truststore used by Storm DRPC setting up HTTPS (SSL).
     */
    @IsBoolean
    public static final String UI_HTTPS_WANT_CLIENT_AUTH = "ui.https.want.client.auth";

    @IsBoolean
    public static final String UI_HTTPS_NEED_CLIENT_AUTH = "ui.https.need.client.auth";

    /**
     * The maximum number of threads that should be used by the Pacemaker. When Pacemaker gets loaded it will spawn new threads, up to this
     * many total, to handle the load.
     */
    @IsNumber
    @IsPositiveNumber
    public static final String PACEMAKER_MAX_THREADS = "pacemaker.max.threads";

    /**
     * This parameter is used by the storm-deploy project to configure the jvm options for the pacemaker daemon.
     */
    @IsStringOrStringList
    public static final String PACEMAKER_CHILDOPTS = "pacemaker.childopts";


    /**
     * This port is used by Storm DRPC for receiving HTTP DPRC requests from clients.
     */
    @IsInteger
    public static final String DRPC_HTTP_PORT = "drpc.http.port";

    /**
     * This port is used by Storm DRPC for receiving HTTPS (SSL) DPRC requests from clients.
     */
    @IsInteger
    public static final String DRPC_HTTPS_PORT = "drpc.https.port";

    /**
     * Path to the keystore used by Storm DRPC for setting up HTTPS (SSL).
     */
    @IsString
    public static final String DRPC_HTTPS_KEYSTORE_PATH = "drpc.https.keystore.path";

    /**
     * Password to the keystore used by Storm DRPC for setting up HTTPS (SSL).
     */
    @IsString
    @Password
    public static final String DRPC_HTTPS_KEYSTORE_PASSWORD = "drpc.https.keystore.password";

    /**
     * Type of keystore used by Storm DRPC for setting up HTTPS (SSL). see http://docs.oracle
     * .com/javase/7/docs/api/java/security/KeyStore.html
     * for more details.
     */
    @IsString
    public static final String DRPC_HTTPS_KEYSTORE_TYPE = "drpc.https.keystore.type";

    /**
     * Password to the private key in the keystore for setting up HTTPS (SSL).
     */
    @IsString
    @Password
    public static final String DRPC_HTTPS_KEY_PASSWORD = "drpc.https.key.password";

    /**
     * Path to the truststore used by Storm DRPC setting up HTTPS (SSL).
     */
    @IsString
    public static final String DRPC_HTTPS_TRUSTSTORE_PATH = "drpc.https.truststore.path";

    /**
     * Password to the truststore used by Storm DRPC setting up HTTPS (SSL).
     */
    @IsString
    @Password
    public static final String DRPC_HTTPS_TRUSTSTORE_PASSWORD = "drpc.https.truststore.password";

    /**
     * Type of truststore used by Storm DRPC for setting up HTTPS (SSL). see http://docs.oracle
     * .com/javase/7/docs/api/java/security/KeyStore.html
     * for more details.
     */
    @IsString
    public static final String DRPC_HTTPS_TRUSTSTORE_TYPE = "drpc.https.truststore.type";

    /**
     * Password to the truststore used by Storm DRPC setting up HTTPS (SSL).
     */
    @IsBoolean
    public static final String DRPC_HTTPS_WANT_CLIENT_AUTH = "drpc.https.want.client.auth";

    @IsBoolean
    public static final String DRPC_HTTPS_NEED_CLIENT_AUTH = "drpc.https.need.client.auth";

    /**
     * Class name for authorization plugin for DRPC client.
     */
    @IsString
    public static final String DRPC_AUTHORIZER = "drpc.authorizer";

    /**
     * The timeout on DRPC requests within the DRPC server. Defaults to 10 minutes. Note that requests can also timeout based on the socket
     * timeout on the DRPC client, and separately based on the topology message timeout for the topology implementing the DRPC function.
     */

    @IsInteger
    @IsPositiveNumber
    @NotNull
    public static final String DRPC_REQUEST_TIMEOUT_SECS = "drpc.request.timeout.secs";

    /**
     * Childopts for Storm DRPC Java process.
     */
    @IsStringOrStringList
    public static final String DRPC_CHILDOPTS = "drpc.childopts";

    /**
     * the metadata configured on the supervisor.
     */
    @IsMapEntryType(keyType = String.class, valueType = String.class)
    public static final String SUPERVISOR_SCHEDULER_META = "supervisor.scheduler.meta";

    /**
     * A list of ports that can run workers on this supervisor. Each worker uses one port, and the supervisor will only run one worker per
     * port. Use this configuration to tune how many workers run on each machine.
     */
    @IsNoDuplicateInList
    @NotNull
    @IsListEntryCustom(entryValidatorClasses = { ConfigValidation.IntegerValidator.class, ConfigValidation.PositiveNumberValidator.class })
    public static final String SUPERVISOR_SLOTS_PORTS = "supervisor.slots.ports";

    /**
     * What blobstore implementation the supervisor should use.
     */
    @IsString
    public static final String SUPERVISOR_BLOBSTORE = "supervisor.blobstore.class";

    /**
     * The distributed cache target size in MB. This is a soft limit to the size of the distributed cache contents.
     */
    @IsPositiveNumber
    @IsInteger
    public static final String SUPERVISOR_LOCALIZER_CACHE_TARGET_SIZE_MB = "supervisor.localizer.cache.target.size.mb";

    /**
     * The distributed cache cleanup interval. Controls how often it scans to attempt to cleanup anything over the cache target size.
     */
    @IsPositiveNumber
    @IsInteger
    public static final String SUPERVISOR_LOCALIZER_CACHE_CLEANUP_INTERVAL_MS = "supervisor.localizer.cleanup.interval.ms";

    /**
     * What blobstore download parallelism the supervisor should use.
     */
    @IsPositiveNumber
    @IsInteger
    public static final String SUPERVISOR_BLOBSTORE_DOWNLOAD_THREAD_COUNT = "supervisor.blobstore.download.thread.count";

    /**
     * Maximum number of retries a supervisor is allowed to make for downloading a blob.
     */
    @IsPositiveNumber
    @IsInteger
    public static final String SUPERVISOR_BLOBSTORE_DOWNLOAD_MAX_RETRIES = "supervisor.blobstore.download.max_retries";

    /**
     * What blobstore implementation nimbus should use.
     */
    @IsString
    public static final String NIMBUS_BLOBSTORE = "nimbus.blobstore.class";

    /**
     * During operations with the blob store, via master, how long a connection is idle before nimbus considers it dead and drops the
     * session and any associated connections.
     */
    @IsPositiveNumber
    @IsInteger
    public static final String NIMBUS_BLOBSTORE_EXPIRATION_SECS = "nimbus.blobstore.expiration.secs";

    /**
     * A number representing the maximum number of workers any single topology can acquire.
     * This will be ignored if the Resource Aware Scheduler is used.
     */
    @IsInteger
    @IsPositiveNumber(includeZero = true)
    public static final String NIMBUS_SLOTS_PER_TOPOLOGY = "nimbus.slots.perTopology";

    /**
     * A class implementing javax.servlet.Filter for DRPC HTTP requests.
     */
    @IsString
    public static final String DRPC_HTTP_FILTER = "drpc.http.filter";

    /**
     * Initialization parameters for the javax.servlet.Filter of the DRPC HTTP service.
     */
    @IsMapEntryType(keyType = String.class, valueType = String.class)
    public static final String DRPC_HTTP_FILTER_PARAMS = "drpc.http.filter.params";

    /**
     * A number representing the maximum number of executors any single topology can acquire.
     */
    @IsInteger
    @IsPositiveNumber(includeZero = true)
    public static final String NIMBUS_EXECUTORS_PER_TOPOLOGY = "nimbus.executors.perTopology";

    /**
     * This parameter is used by the storm-deploy project to configure the jvm options for the supervisor daemon.
     */
    @IsStringOrStringList
    public static final String SUPERVISOR_CHILDOPTS = "supervisor.childopts";

    /**
     * How long a worker can go without heartbeating during the initial launch before the supervisor tries to restart the worker process.
     * This value override supervisor.worker.timeout.secs during launch because there is additional overhead to starting and configuring the
     * JVM on launch.
     * Can be exceeded when {@link Config#TOPOLOGY_WORKER_TIMEOUT_SECS} is set.
     */
    @IsInteger
    @IsPositiveNumber
    @NotNull
    public static final String SUPERVISOR_WORKER_START_TIMEOUT_SECS = "supervisor.worker.start.timeout.secs";

    /**
     * Whether or not the supervisor should launch workers assigned to it. Defaults to true -- and you should probably never change this
     * value. This configuration is used in the Storm unit tests.
     */
    @IsBoolean
    public static final String SUPERVISOR_ENABLE = "supervisor.enable";

    /**
     * how often the supervisor sends a heartbeat to the master.
     */
    @IsInteger
    public static final String SUPERVISOR_HEARTBEAT_FREQUENCY_SECS = "supervisor.heartbeat.frequency.secs";


    /**
     * How often the supervisor checks the worker heartbeats to see if any of them need to be restarted.
     */
    @IsInteger
    @IsPositiveNumber
    public static final String SUPERVISOR_MONITOR_FREQUENCY_SECS = "supervisor.monitor.frequency.secs";


    /**
     * The jvm profiler opts provided to workers launched by this supervisor.
     */
    @IsStringOrStringList
    public static final String WORKER_PROFILER_CHILDOPTS = "worker.profiler.childopts";

    /**
     * Enable profiling of worker JVMs using Oracle's Java Flight Recorder. Unlocking commercial features requires a special license from
     * Oracle. See http://www.oracle.com/technetwork/java/javase/terms/products/index.html
     */
    @IsBoolean
    public static final String WORKER_PROFILER_ENABLED = "worker.profiler.enabled";

    /**
     * The command launched supervisor with worker arguments pid, action and [target_directory] Where action is - start profile, stop
     * profile, jstack, heapdump and kill against pid.
     */
    @IsString
    public static final String WORKER_PROFILER_COMMAND = "worker.profiler.command";

    /**
     * A list of classes implementing IClusterMetricsConsumer (See storm.yaml.example for exact config format). Each listed class will be
     * routed cluster related metrics data. Each listed class maps 1:1 to a ClusterMetricsConsumerExecutor and they're executed in Nimbus.
     * Only consumers which run in leader Nimbus receives metrics data.
     */
    @IsListEntryCustom(entryValidatorClasses = { ConfigValidation.ClusterMetricRegistryValidator.class })
    public static final String STORM_CLUSTER_METRICS_CONSUMER_REGISTER = "storm.cluster.metrics.consumer.register";

    /**
     * How often cluster metrics data is published to metrics consumer.
     */
    @NotNull
    @IsPositiveNumber
    public static final String STORM_CLUSTER_METRICS_CONSUMER_PUBLISH_INTERVAL_SECS =
        "storm.cluster.metrics.consumer.publish.interval.secs";

    /**
     * Enables user-first classpath. See topology.classpath.beginning.
     */
    @IsBoolean
    public static final String STORM_TOPOLOGY_CLASSPATH_BEGINNING_ENABLED = "storm.topology.classpath.beginning.enabled";

    /**
     * This value is passed to spawned JVMs (e.g., Nimbus, Supervisor, and Workers) for the java.library.path value. java.library.path tells
     * the JVM where to look for native libraries. It is necessary to set this config correctly since Storm uses the ZeroMQ and JZMQ native
     * libs.
     */
    @IsString
    public static final String JAVA_LIBRARY_PATH = "java.library.path";

    /**
     * The path to use as the zookeeper dir when running a zookeeper server via "storm dev-zookeeper". This zookeeper instance is only
     * intended for development; it is not a production grade zookeeper setup.
     */
    @IsString
    public static final String DEV_ZOOKEEPER_PATH = "dev.zookeeper.path";

    /**
     * A map from topology name to the number of machines that should be dedicated for that topology. Set storm.scheduler to
     * org.apache.storm.scheduler.IsolationScheduler to make use of the isolation scheduler.
     */
    @IsMapEntryType(keyType = String.class, valueType = Number.class)
    public static final String ISOLATION_SCHEDULER_MACHINES = "isolation.scheduler.machines";

    /**
     * For ArtifactoryConfigLoader, this can either be a reference to an individual file in Artifactory or to a directory. If it is a
     * directory, the file with the largest lexographic name will be returned. Users need to add "artifactory+" to the beginning of the real
     * URI to use ArtifactoryConfigLoader. For FileConfigLoader, this is the URI pointing to a file.
     */
    @IsString
    public static final String SCHEDULER_CONFIG_LOADER_URI = "scheduler.config.loader.uri";

    /**
     * It is the frequency at which the plugin will call out to artifactory instead of returning the most recently cached result. Currently
     * it's only used in ArtifactoryConfigLoader.
     */
    @IsInteger
    @IsPositiveNumber
    public static final String SCHEDULER_CONFIG_LOADER_POLLTIME_SECS = "scheduler.config.loader.polltime.secs";

    /**
     * It is the amount of time an http connection to the artifactory server will wait before timing out. Currently it's only used in
     * ArtifactoryConfigLoader.
     */
    @IsInteger
    @IsPositiveNumber
    public static final String SCHEDULER_CONFIG_LOADER_TIMEOUT_SECS = "scheduler.config.loader.timeout.secs";

    /**
     * It is the part of the uri, configurable in Artifactory, which represents the top of the directory tree. It's only used in
     * ArtifactoryConfigLoader.
     */
    @IsString
    public static final String SCHEDULER_CONFIG_LOADER_ARTIFACTORY_BASE_DIRECTORY = "scheduler.config.loader.artifactory.base.directory";

    /**
     * A map from the user name to the number of machines that should that user is allowed to use. Set storm.scheduler to
     * org.apache.storm.scheduler.multitenant.MultitenantScheduler
     */
    @IsMapEntryType(keyType = String.class, valueType = Number.class)
    public static final String MULTITENANT_SCHEDULER_USER_POOLS = "multitenant.scheduler.user.pools";

    /**
     * A map of users to another map of the resource guarantees of the user. Used by Resource Aware Scheduler to ensure per user resource
     * guarantees.
     */
    @IsMapEntryCustom(
        keyValidatorClasses = { ConfigValidation.StringValidator.class },
        valueValidatorClasses = { ConfigValidation.UserResourcePoolEntryValidator.class })
    public static final String RESOURCE_AWARE_SCHEDULER_USER_POOLS = "resource.aware.scheduler.user.pools";

    /**
     * the class that specifies the scheduling priority strategy to use in ResourceAwareScheduler.
     */
    @NotNull
    @IsImplementationOfClass(implementsClass = ISchedulingPriorityStrategy.class)
    public static final String RESOURCE_AWARE_SCHEDULER_PRIORITY_STRATEGY = "resource.aware.scheduler.priority.strategy";

    /**
     * The maximum number of times that the RAS will attempt to schedule a topology. The default is 5.
     */
    @IsInteger
    @IsPositiveNumber
    public static final String RESOURCE_AWARE_SCHEDULER_MAX_TOPOLOGY_SCHEDULING_ATTEMPTS =
        "resource.aware.scheduler.max.topology.scheduling.attempts";

    /*
     * The maximum number of states that will be searched looking for a solution in the constraint solver strategy
     */
    @IsInteger
    @IsPositiveNumber
    public static final String RESOURCE_AWARE_SCHEDULER_MAX_STATE_SEARCH = "resource.aware.scheduler.constraint.max.state.search";

    /**
     * How often nimbus's background thread to sync code for missing topologies should run.
     */
    @IsInteger
    public static final String NIMBUS_CODE_SYNC_FREQ_SECS = "nimbus.code.sync.freq.secs";

    /**
     * The plugin to be used for resource isolation.
     */
    @IsImplementationOfClass(implementsClass = ResourceIsolationInterface.class)
    public static final String STORM_RESOURCE_ISOLATION_PLUGIN = "storm.resource.isolation.plugin";

    /**
     * CGroup Setting below.
     */

    /**
     * resources to to be controlled by cgroups.
     */
    @IsStringList
    public static final String STORM_CGROUP_RESOURCES = "storm.cgroup.resources";

    /**
     * name for the cgroup hierarchy.
     */
    @IsString
    public static final String STORM_CGROUP_HIERARCHY_NAME = "storm.cgroup.hierarchy.name";

    /**
     * flag to determine whether to use a resource isolation plugin Also determines whether the unit tests for cgroup runs. If
     * storm.resource.isolation.plugin.enable is set to false the unit tests for cgroups will not run
     */
    @IsBoolean
    public static final String STORM_RESOURCE_ISOLATION_PLUGIN_ENABLE = "storm.resource.isolation.plugin.enable";
    /**
     * Class implementing MetricStore.  Runs on Nimbus.
     */
    @NotNull
    @IsString
    // Validating class implementation could fail on non-Nimbus Daemons.  Nimbus will catch the class not found on startup
    // and log an error message, so just validating this as a String for now.
    public static final String STORM_METRIC_STORE_CLASS = "storm.metricstore.class";
    /**
     * Class implementing WorkerMetricsProcessor.  Runs on Supervisors.
     */
    @NotNull
    @IsString
    public static final String STORM_METRIC_PROCESSOR_CLASS = "storm.metricprocessor.class";
    /**
     * RocksDB file location. This setting is specific to the org.apache.storm.metricstore.rocksdb.RocksDbStore implementation for the
     * storm.metricstore.class.
     */
    @IsString
    public static final String STORM_ROCKSDB_LOCATION = "storm.metricstore.rocksdb.location";
    /**
     * RocksDB create if missing flag. This setting is specific to the org.apache.storm.metricstore.rocksdb.RocksDbStore implementation for
     * the storm.metricstore.class.
     */
    @IsBoolean
    public static final String STORM_ROCKSDB_CREATE_IF_MISSING = "storm.metricstore.rocksdb.create_if_missing";
    /**
     * RocksDB metadata cache capacity. This setting is specific to the org.apache.storm.metricstore.rocksdb.RocksDbStore implementation for
     * the storm.metricstore.class.
     */
    @IsInteger
    public static final String STORM_ROCKSDB_METADATA_STRING_CACHE_CAPACITY = "storm.metricstore.rocksdb.metadata_string_cache_capacity";
    /**
     * RocksDB setting for length of metric retention. This setting is specific to the org.apache.storm.metricstore.rocksdb.RocksDbStore
     * implementation for the storm.metricstore.class.
     */
    @IsInteger
    public static final String STORM_ROCKSDB_METRIC_RETENTION_HOURS = "storm.metricstore.rocksdb.retention_hours";

    // Configs for memory enforcement done by the supervisor (not cgroups directly)
    /**
     * RocksDB setting for period of metric deletion thread. This setting is specific to the org.apache.storm.metricstore.rocksdb
     * .RocksDbStore
     * implementation for the storm.metricstore.class.
     */
    @IsInteger
    public static final String STORM_ROCKSDB_METRIC_DELETION_PERIOD_HOURS = "storm.metricstore.rocksdb.deletion_period_hours";
    /**
     * In nimbus on startup check if all of the zookeeper ACLs are correct before starting.  If not don't start nimbus.
     */
    @IsBoolean
    public static final String STORM_NIMBUS_ZOOKEEPER_ACLS_CHECK = "storm.nimbus.zookeeper.acls.check";
    /**
     * In nimbus on startup check if all of the zookeeper ACLs are correct before starting.  If not do your best to fix them before nimbus
     * starts, if it cannot fix them nimbus will not start. This overrides any value set for storm.nimbus.zookeeper.acls.check.
     */
    @IsBoolean
    public static final String STORM_NIMBUS_ZOOKEEPER_ACLS_FIXUP = "storm.nimbus.zookeeper.acls.fixup";
    /**
     * Server side validation that @{see Config#TOPOLOGY_SCHEDULER_STRATEGY} is set ot a subclass of IStrategy.
     */
    @IsImplementationOfClass(implementsClass = IStrategy.class)
    public static final String VALIDATE_TOPOLOGY_SCHEDULER_STRATEGY = Config.TOPOLOGY_SCHEDULER_STRATEGY;

    /**
     * Class name of the HTTP credentials plugin for the UI.
     */
    @IsImplementationOfClass(implementsClass = IHttpCredentialsPlugin.class)
    public static final String UI_HTTP_CREDS_PLUGIN = "ui.http.creds.plugin";

    /**
     * Class name of the HTTP credentials plugin for DRPC.
     */
    @IsImplementationOfClass(implementsClass = IHttpCredentialsPlugin.class)
    public static final String DRPC_HTTP_CREDS_PLUGIN = "drpc.http.creds.plugin";

    /**
     * root directory for cgoups.
     */
    @IsString
    public static String STORM_SUPERVISOR_CGROUP_ROOTDIR = "storm.supervisor.cgroup.rootdir";
    /**
     * the manually set memory limit (in MB) for each CGroup on supervisor node.
     */
    @IsPositiveNumber
    public static String STORM_WORKER_CGROUP_MEMORY_MB_LIMIT = "storm.worker.cgroup.memory.mb.limit";
    /**
     * the manually set cpu share for each CGroup on supervisor node.
     */
    @IsPositiveNumber
    public static String STORM_WORKER_CGROUP_CPU_LIMIT = "storm.worker.cgroup.cpu.limit";
    /**
     * full path to cgexec command.
     */
    @IsString
    public static String STORM_CGROUP_CGEXEC_CMD = "storm.cgroup.cgexec.cmd";
    /**
     * Please use STORM_SUPERVISOR_MEMORY_LIMIT_TOLERANCE_MARGIN_MB instead. The amount of memory a worker can exceed its allocation before
     * cgroup will kill it.
     */
    @IsPositiveNumber(includeZero = true)
    public static String STORM_CGROUP_MEMORY_LIMIT_TOLERANCE_MARGIN_MB =
        "storm.cgroup.memory.limit.tolerance.margin.mb";
    /**
     * To determine whether or not to cgroups should inherit cpuset.cpus and cpuset.mems config values form parent cgroup
     * Note that cpuset.cpus and cpuset.mems configs in a cgroup must be initialized (i.e. contain a valid value) prior to
     * being able to launch processes in that cgroup.  The common use case for this config is when the linux distribution
     * that is used does not support the cgroup.clone_children config.
     */
    @IsBoolean
    public static String STORM_CGROUP_INHERIT_CPUSET_CONFIGS = "storm.cgroup.inherit.cpuset.configs";
    /**
     * Java does not always play nicely with cgroups. It is coming but not fully implemented and not for the way storm uses cgroups. In the
     * short term you can disable the hard memory enforcement by cgroups and let the supervisor handle shooting workers going over their
     * limit in a kinder way.
     */
    @IsBoolean
    public static String STORM_CGROUP_MEMORY_ENFORCEMENT_ENABLE = "storm.cgroup.memory.enforcement.enable";
    /**
     * Memory given to each worker for free (because java and storm have some overhead). This is memory on the box that the workers can use.
     * This should not be included in SUPERVISOR_MEMORY_CAPACITY_MB, as nimbus does not use this memory for scheduling.
     */
    @IsPositiveNumber
    public static String STORM_SUPERVISOR_MEMORY_LIMIT_TOLERANCE_MARGIN_MB =
        "storm.supervisor.memory.limit.tolerance.margin.mb";
    /**
     * A multiplier for the memory limit of a worker that will have the supervisor shoot it immediately. 1.0 means shoot the worker as soon
     * as it goes over. 2.0 means shoot the worker if its usage is double what was requested. This value is combined with
     * STORM_SUPERVISOR_HARD_MEMORY_LIMIT_OVERAGE and which ever is greater is used for enforcement. This allows small workers to not be
     * shot.
     */
    @IsPositiveNumber
    public static String STORM_SUPERVISOR_HARD_MEMORY_LIMIT_MULTIPLIER =
        "storm.supervisor.hard.memory.limit.multiplier";
    /**
     * If the memory usage of a worker goes over its limit by this value is it shot immediately. This value is combined with
     * STORM_SUPERVISOR_HARD_LIMIT_MEMORY_MULTIPLIER and which ever is greater is used for enforcement. This allows small workers to not be
     * shot.
     */
    @IsPositiveNumber(includeZero = true)
    public static String STORM_SUPERVISOR_HARD_LIMIT_MEMORY_OVERAGE_MB = "storm.supervisor.hard.memory.limit.overage.mb";
    /**
     * If the amount of memory that is free in the system (either on the box or in the supervisor's cgroup) is below this number (in MB)
     * consider the system to be in low memory mode and start shooting workers if they are over their limit.
     */
    @IsPositiveNumber
    public static String STORM_SUPERVISOR_LOW_MEMORY_THRESHOLD_MB = "storm.supervisor.low.memory.threshold.mb";
    /**
     * If the amount of memory that is free in the system (either on the box or in the supervisor's cgroup) is below this number (in MB)
     * consider the system to be a little low on memory and start shooting workers if they are over their limit for a given grace period
     * STORM_SUPERVISOR_MEDIUM_MEMORY_GRACE_PERIOD_MS.
     */
    @IsPositiveNumber
    public static String STORM_SUPERVISOR_MEDIUM_MEMORY_THRESHOLD_MB = "storm.supervisor.medium.memory.threshold.mb";
    /**
     * The number of milliseconds that a worker is allowed to be over their limit when there is a medium amount of memory free in the
     * system.
     */
    @IsPositiveNumber
    public static String STORM_SUPERVISOR_MEDIUM_MEMORY_GRACE_PERIOD_MS =
        "storm.supervisor.medium.memory.grace.period.ms";

    /**
     * The config indicates the minimum percentage of cpu for a core that a worker will use. Assuming the a core value to be
     * 100, a value of 10 indicates 10% of the core. The P in PCORE represents the term "physical".  A default value will be set for this
     * config if user does not override.
     * <P></P>
     * Workers in containers or cgroups may require a minimum amount of CPU in order to launch within the supervisor timeout.
     * This setting allows configuring this to occur.
     */
    @IsPositiveNumber(includeZero = true)
    public static String STORM_WORKER_MIN_CPU_PCORE_PERCENT = "storm.worker.min.cpu.pcore.percent";

    // VALIDATION ONLY CONFIGS
    // Some configs inside Config.java may reference classes we don't want to expose in storm-client, but we still want to validate
    // That they reference a valid class.  To allow this to happen we do part of the validation on the client side with annotations on
    // static final members of the Config class, and other validations here.  We avoid naming them the same thing because clojure code
    // walks these two classes and creates clojure constants for these values.
    /**
     * The number of hours a worker token is valid for.  This also sets how frequently worker tokens will be renewed.
     */
    @IsPositiveNumber
    public static String STORM_WORKER_TOKEN_LIFE_TIME_HOURS = "storm.worker.token.life.time.hours";

    public static String getCgroupRootDir(Map<String, Object> conf) {
        return (String) conf.get(STORM_SUPERVISOR_CGROUP_ROOTDIR);
    }

    public static String getCgroupStormHierarchyDir(Map<String, Object> conf) {
        return (String) conf.get(Config.STORM_CGROUP_HIERARCHY_DIR);
    }

    /**
     * Get the cgroup resources from the conf.
     *
     * @param conf the config to read
     * @return the resources.
     */
    public static ArrayList<String> getCgroupStormResources(Map<String, Object> conf) {
        ArrayList<String> ret = new ArrayList<>();
        for (String entry : ((Iterable<String>) conf.get(DaemonConfig.STORM_CGROUP_RESOURCES))) {
            ret.add(entry);
        }
        return ret;
    }

    public static String getCgroupStormHierarchyName(Map<String, Object> conf) {
        return (String) conf.get(DaemonConfig.STORM_CGROUP_HIERARCHY_NAME);
    }
}