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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.kafka.streams;
import org.apache.kafka.clients.CommonClientConfigs;
import org.apache.kafka.clients.admin.Admin;
import org.apache.kafka.clients.admin.AdminClientConfig;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.common.config.AbstractConfig;
import org.apache.kafka.common.config.ConfigDef;
import org.apache.kafka.common.config.ConfigDef.Importance;
import org.apache.kafka.common.config.ConfigDef.Type;
import org.apache.kafka.common.config.ConfigException;
import org.apache.kafka.common.config.TopicConfig;
import org.apache.kafka.common.metrics.Sensor;
import org.apache.kafka.common.metrics.Sensor.RecordingLevel;
import org.apache.kafka.common.serialization.Serde;
import org.apache.kafka.streams.errors.DefaultProductionExceptionHandler;
import org.apache.kafka.streams.errors.DeserializationExceptionHandler;
import org.apache.kafka.streams.errors.LogAndFailExceptionHandler;
import org.apache.kafka.streams.errors.ProductionExceptionHandler;
import org.apache.kafka.streams.errors.StreamsException;
import org.apache.kafka.streams.internals.StreamsConfigUtils;
import org.apache.kafka.streams.processor.FailOnInvalidTimestamp;
import org.apache.kafka.streams.processor.TimestampExtractor;
import org.apache.kafka.streams.processor.internals.StreamsPartitionAssignor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.File;
import java.time.Duration;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;
import java.util.Properties;
import java.util.Set;
import java.util.stream.Collectors;
import static org.apache.kafka.common.IsolationLevel.READ_COMMITTED;
import static org.apache.kafka.common.config.ConfigDef.ListSize.atMostOfSize;
import static org.apache.kafka.common.config.ConfigDef.Range.atLeast;
import static org.apache.kafka.common.config.ConfigDef.Range.between;
import static org.apache.kafka.common.config.ConfigDef.ValidString.in;
import static org.apache.kafka.common.config.ConfigDef.parseType;
/**
* Configuration for a {@link KafkaStreams} instance.
* Can also be used to configure the Kafka Streams internal {@link KafkaConsumer}, {@link KafkaProducer} and {@link Admin}.
* To avoid consumer/producer/admin property conflicts, you should prefix those properties using
* {@link #consumerPrefix(String)}, {@link #producerPrefix(String)} and {@link #adminClientPrefix(String)}, respectively.
*
* Example:
*
{@code
* // potentially wrong: sets "metadata.max.age.ms" to 1 minute for producer AND consumer
* Properties streamsProperties = new Properties();
* streamsProperties.put(ConsumerConfig.METADATA_MAX_AGE_CONFIG, 60000);
* // or
* streamsProperties.put(ProducerConfig.METADATA_MAX_AGE_CONFIG, 60000);
*
* // suggested:
* Properties streamsProperties = new Properties();
* // sets "metadata.max.age.ms" to 1 minute for consumer only
* streamsProperties.put(StreamsConfig.consumerPrefix(ConsumerConfig.METADATA_MAX_AGE_CONFIG), 60000);
* // sets "metadata.max.age.ms" to 1 minute for producer only
* streamsProperties.put(StreamsConfig.producerPrefix(ProducerConfig.METADATA_MAX_AGE_CONFIG), 60000);
*
* StreamsConfig streamsConfig = new StreamsConfig(streamsProperties);
* }
*
* This instance can also be used to pass in custom configurations to different modules (e.g. passing a special config in your customized serde class).
* The consumer/producer/admin prefix can also be used to distinguish these custom config values passed to different clients with the same config name.
* * Example:
* {@code
* Properties streamsProperties = new Properties();
* // sets "my.custom.config" to "foo" for consumer only
* streamsProperties.put(StreamsConfig.consumerPrefix("my.custom.config"), "foo");
* // sets "my.custom.config" to "bar" for producer only
* streamsProperties.put(StreamsConfig.producerPrefix("my.custom.config"), "bar");
* // sets "my.custom.config2" to "boom" for all clients universally
* streamsProperties.put("my.custom.config2", "boom");
*
* // as a result, inside producer's serde class configure(..) function,
* // users can now read both key-value pairs "my.custom.config" -> "foo"
* // and "my.custom.config2" -> "boom" from the config map
* StreamsConfig streamsConfig = new StreamsConfig(streamsProperties);
* }
*
*
* When increasing {@link ProducerConfig#MAX_BLOCK_MS_CONFIG} to be more resilient to non-available brokers you should also
* increase {@link ConsumerConfig#MAX_POLL_INTERVAL_MS_CONFIG} using the following guidance:
*
* max.poll.interval.ms > max.block.ms
*
*
*
* Kafka Streams requires at least the following properties to be set:
*
* - {@link #APPLICATION_ID_CONFIG "application.id"}
* - {@link #BOOTSTRAP_SERVERS_CONFIG "bootstrap.servers"}
*
*
* By default, Kafka Streams does not allow users to overwrite the following properties (Streams setting shown in parentheses):
*
* - {@link ConsumerConfig#GROUP_ID_CONFIG "group.id"} (<application.id>) - Streams client will always use the application ID a consumer group ID
* - {@link ConsumerConfig#ENABLE_AUTO_COMMIT_CONFIG "enable.auto.commit"} (false) - Streams client will always disable/turn off auto committing
* - {@link ConsumerConfig#PARTITION_ASSIGNMENT_STRATEGY_CONFIG "partition.assignment.strategy"} (
StreamsPartitionAssignor) - Streams client will always use its own partition assignor
*
*
* If {@link #PROCESSING_GUARANTEE_CONFIG "processing.guarantee"} is set to {@link #EXACTLY_ONCE_V2 "exactly_once_v2"},
* {@link #EXACTLY_ONCE "exactly_once"} (deprecated), or {@link #EXACTLY_ONCE_BETA "exactly_once_beta"} (deprecated), Kafka Streams does not
* allow users to overwrite the following properties (Streams setting shown in parentheses):
*
* - {@link ConsumerConfig#ISOLATION_LEVEL_CONFIG "isolation.level"} (read_committed) - Consumers will always read committed data only
* - {@link ProducerConfig#ENABLE_IDEMPOTENCE_CONFIG "enable.idempotence"} (true) - Producer will always have idempotency enabled
*
*
* @see KafkaStreams#KafkaStreams(org.apache.kafka.streams.Topology, Properties)
* @see ConsumerConfig
* @see ProducerConfig
*/
public class StreamsConfig extends AbstractConfig {
private static final Logger log = LoggerFactory.getLogger(StreamsConfig.class);
private static final ConfigDef CONFIG;
private final boolean eosEnabled;
private static final long DEFAULT_COMMIT_INTERVAL_MS = 30000L;
private static final long EOS_DEFAULT_COMMIT_INTERVAL_MS = 100L;
private static final int DEFAULT_TRANSACTION_TIMEOUT = 10000;
public static final int DUMMY_THREAD_INDEX = 1;
public static final long MAX_TASK_IDLE_MS_DISABLED = -1;
// We impose these limitations because client tags are encoded into the subscription info,
// which is part of the group metadata message that is persisted into the internal topic.
public static final int MAX_RACK_AWARE_ASSIGNMENT_TAG_LIST_SIZE = 5;
public static final int MAX_RACK_AWARE_ASSIGNMENT_TAG_KEY_LENGTH = 20;
public static final int MAX_RACK_AWARE_ASSIGNMENT_TAG_VALUE_LENGTH = 30;
/**
* Prefix used to provide default topic configs to be applied when creating internal topics.
* These should be valid properties from {@link org.apache.kafka.common.config.TopicConfig TopicConfig}.
* It is recommended to use {@link #topicPrefix(String)}.
*/
// TODO: currently we cannot get the full topic configurations and hence cannot allow topic configs without the prefix,
// this can be lifted once kafka.log.LogConfig is completely deprecated by org.apache.kafka.common.config.TopicConfig
@SuppressWarnings("WeakerAccess")
public static final String TOPIC_PREFIX = "topic.";
/**
* Prefix used to isolate {@link KafkaConsumer consumer} configs from other client configs.
* It is recommended to use {@link #consumerPrefix(String)} to add this prefix to {@link ConsumerConfig consumer
* properties}.
*/
@SuppressWarnings("WeakerAccess")
public static final String CONSUMER_PREFIX = "consumer.";
/**
* Prefix used to override {@link KafkaConsumer consumer} configs for the main consumer client from
* the general consumer client configs. The override precedence is the following (from highest to lowest precedence):
* 1. main.consumer.[config-name]
* 2. consumer.[config-name]
* 3. [config-name]
*/
@SuppressWarnings("WeakerAccess")
public static final String MAIN_CONSUMER_PREFIX = "main.consumer.";
/**
* Prefix used to override {@link KafkaConsumer consumer} configs for the restore consumer client from
* the general consumer client configs. The override precedence is the following (from highest to lowest precedence):
* 1. restore.consumer.[config-name]
* 2. consumer.[config-name]
* 3. [config-name]
*/
@SuppressWarnings("WeakerAccess")
public static final String RESTORE_CONSUMER_PREFIX = "restore.consumer.";
/**
* Prefix used to override {@link KafkaConsumer consumer} configs for the global consumer client from
* the general consumer client configs. The override precedence is the following (from highest to lowest precedence):
* 1. global.consumer.[config-name]
* 2. consumer.[config-name]
* 3. [config-name]
*/
@SuppressWarnings("WeakerAccess")
public static final String GLOBAL_CONSUMER_PREFIX = "global.consumer.";
/**
* Prefix used to isolate {@link KafkaProducer producer} configs from other client configs.
* It is recommended to use {@link #producerPrefix(String)} to add this prefix to {@link ProducerConfig producer
* properties}.
*/
@SuppressWarnings("WeakerAccess")
public static final String PRODUCER_PREFIX = "producer.";
/**
* Prefix used to isolate {@link Admin admin} configs from other client configs.
* It is recommended to use {@link #adminClientPrefix(String)} to add this prefix to {@link AdminClientConfig admin
* client properties}.
*/
@SuppressWarnings("WeakerAccess")
public static final String ADMIN_CLIENT_PREFIX = "admin.";
/**
* Prefix used to add arbitrary tags to a Kafka Stream's instance as key-value pairs.
* Example:
* client.tag.zone=zone1
* client.tag.cluster=cluster1
*/
@SuppressWarnings("WeakerAccess")
public static final String CLIENT_TAG_PREFIX = "client.tag.";
/**
* Config value for parameter {@link #TOPOLOGY_OPTIMIZATION_CONFIG "topology.optimization"} for disabling topology optimization
*/
public static final String NO_OPTIMIZATION = "none";
/**
* Config value for parameter {@link #TOPOLOGY_OPTIMIZATION_CONFIG "topology.optimization"} for enabling topology optimization
*/
public static final String OPTIMIZE = "all";
/**
* Config value for parameter {@link #UPGRADE_FROM_CONFIG "upgrade.from"} for upgrading an application from version {@code 0.10.0.x}.
*/
@SuppressWarnings("WeakerAccess")
public static final String UPGRADE_FROM_0100 = "0.10.0";
/**
* Config value for parameter {@link #UPGRADE_FROM_CONFIG "upgrade.from"} for upgrading an application from version {@code 0.10.1.x}.
*/
@SuppressWarnings("WeakerAccess")
public static final String UPGRADE_FROM_0101 = "0.10.1";
/**
* Config value for parameter {@link #UPGRADE_FROM_CONFIG "upgrade.from"} for upgrading an application from version {@code 0.10.2.x}.
*/
@SuppressWarnings("WeakerAccess")
public static final String UPGRADE_FROM_0102 = "0.10.2";
/**
* Config value for parameter {@link #UPGRADE_FROM_CONFIG "upgrade.from"} for upgrading an application from version {@code 0.11.0.x}.
*/
@SuppressWarnings("WeakerAccess")
public static final String UPGRADE_FROM_0110 = "0.11.0";
/**
* Config value for parameter {@link #UPGRADE_FROM_CONFIG "upgrade.from"} for upgrading an application from version {@code 1.0.x}.
*/
@SuppressWarnings("WeakerAccess")
public static final String UPGRADE_FROM_10 = "1.0";
/**
* Config value for parameter {@link #UPGRADE_FROM_CONFIG "upgrade.from"} for upgrading an application from version {@code 1.1.x}.
*/
@SuppressWarnings("WeakerAccess")
public static final String UPGRADE_FROM_11 = "1.1";
/**
* Config value for parameter {@link #UPGRADE_FROM_CONFIG "upgrade.from"} for upgrading an application from version {@code 2.0.x}.
*/
@SuppressWarnings("WeakerAccess")
public static final String UPGRADE_FROM_20 = "2.0";
/**
* Config value for parameter {@link #UPGRADE_FROM_CONFIG "upgrade.from"} for upgrading an application from version {@code 2.1.x}.
*/
@SuppressWarnings("WeakerAccess")
public static final String UPGRADE_FROM_21 = "2.1";
/**
* Config value for parameter {@link #UPGRADE_FROM_CONFIG "upgrade.from"} for upgrading an application from version {@code 2.2.x}.
*/
@SuppressWarnings("WeakerAccess")
public static final String UPGRADE_FROM_22 = "2.2";
/**
* Config value for parameter {@link #UPGRADE_FROM_CONFIG "upgrade.from"} for upgrading an application from version {@code 2.3.x}.
*/
@SuppressWarnings("WeakerAccess")
public static final String UPGRADE_FROM_23 = "2.3";
/**
* Config value for parameter {@link #PROCESSING_GUARANTEE_CONFIG "processing.guarantee"} for at-least-once processing guarantees.
*/
@SuppressWarnings("WeakerAccess")
public static final String AT_LEAST_ONCE = "at_least_once";
/**
* Config value for parameter {@link #PROCESSING_GUARANTEE_CONFIG "processing.guarantee"} for exactly-once processing guarantees.
*
* Enabling exactly-once processing semantics requires broker version 0.11.0 or higher.
* If you enable this feature Kafka Streams will use more resources (like broker connections)
* compared to {@link #AT_LEAST_ONCE "at_least_once"} and {@link #EXACTLY_ONCE_V2 "exactly_once_v2"}.
*
* @deprecated Since 3.0.0, will be removed in 4.0. Use {@link #EXACTLY_ONCE_V2 "exactly_once_v2"} instead.
*/
@SuppressWarnings("WeakerAccess")
@Deprecated
public static final String EXACTLY_ONCE = "exactly_once";
/**
* Config value for parameter {@link #PROCESSING_GUARANTEE_CONFIG "processing.guarantee"} for exactly-once processing guarantees.
*
* Enabling exactly-once (beta) requires broker version 2.5 or higher.
* If you enable this feature Kafka Streams will use fewer resources (like broker connections)
* compared to the {@link #EXACTLY_ONCE} (deprecated) case.
*
* @deprecated Since 3.0.0, will be removed in 4.0. Use {@link #EXACTLY_ONCE_V2 "exactly_once_v2"} instead.
*/
@SuppressWarnings("WeakerAccess")
@Deprecated
public static final String EXACTLY_ONCE_BETA = "exactly_once_beta";
/**
* Config value for parameter {@link #PROCESSING_GUARANTEE_CONFIG "processing.guarantee"} for exactly-once processing guarantees.
*
* Enabling exactly-once-v2 requires broker version 2.5 or higher.
*/
@SuppressWarnings("WeakerAccess")
public static final String EXACTLY_ONCE_V2 = "exactly_once_v2";
/**
* Config value for parameter {@link #BUILT_IN_METRICS_VERSION_CONFIG "built.in.metrics.version"} for the latest built-in metrics version.
*/
public static final String METRICS_LATEST = "latest";
/** {@code acceptable.recovery.lag} */
public static final String ACCEPTABLE_RECOVERY_LAG_CONFIG = "acceptable.recovery.lag";
private static final String ACCEPTABLE_RECOVERY_LAG_DOC = "The maximum acceptable lag (number of offsets to catch up) for a client to be considered caught-up enough" +
" to receive an active task assignment. Upon assignment, it will still restore the rest of the changelog" +
" before processing. To avoid a pause in processing during rebalances, this config" +
" should correspond to a recovery time of well under a minute for a given workload. Must be at least 0.";
/** {@code application.id} */
@SuppressWarnings("WeakerAccess")
public static final String APPLICATION_ID_CONFIG = "application.id";
private static final String APPLICATION_ID_DOC = "An identifier for the stream processing application. Must be unique within the Kafka cluster. It is used as 1) the default client-id prefix, 2) the group-id for membership management, 3) the changelog topic prefix.";
/**{@code application.server} */
@SuppressWarnings("WeakerAccess")
public static final String APPLICATION_SERVER_CONFIG = "application.server";
private static final String APPLICATION_SERVER_DOC = "A host:port pair pointing to a user-defined endpoint that can be used for state store discovery and interactive queries on this KafkaStreams instance.";
/** {@code bootstrap.servers} */
@SuppressWarnings("WeakerAccess")
public static final String BOOTSTRAP_SERVERS_CONFIG = CommonClientConfigs.BOOTSTRAP_SERVERS_CONFIG;
/** {@code buffered.records.per.partition} */
@SuppressWarnings("WeakerAccess")
public static final String BUFFERED_RECORDS_PER_PARTITION_CONFIG = "buffered.records.per.partition";
public static final String BUFFERED_RECORDS_PER_PARTITION_DOC = "Maximum number of records to buffer per partition.";
/** {@code built.in.metrics.version} */
public static final String BUILT_IN_METRICS_VERSION_CONFIG = "built.in.metrics.version";
private static final String BUILT_IN_METRICS_VERSION_DOC = "Version of the built-in metrics to use.";
/** {@code cache.max.bytes.buffering} */
@SuppressWarnings("WeakerAccess")
public static final String CACHE_MAX_BYTES_BUFFERING_CONFIG = "cache.max.bytes.buffering";
public static final String CACHE_MAX_BYTES_BUFFERING_DOC = "Maximum number of memory bytes to be used for buffering across all threads";
/** {@code client.id} */
@SuppressWarnings("WeakerAccess")
public static final String CLIENT_ID_CONFIG = CommonClientConfigs.CLIENT_ID_CONFIG;
private static final String CLIENT_ID_DOC = "An ID prefix string used for the client IDs of internal consumer, producer and restore-consumer," +
" with pattern '-StreamThread--'.";
/** {@code commit.interval.ms} */
@SuppressWarnings("WeakerAccess")
public static final String COMMIT_INTERVAL_MS_CONFIG = "commit.interval.ms";
private static final String COMMIT_INTERVAL_MS_DOC = "The frequency in milliseconds with which to save the position of the processor." +
" (Note, if processing.guarantee is set to " + EXACTLY_ONCE_V2 + ", " + EXACTLY_ONCE + ",the default value is " + EOS_DEFAULT_COMMIT_INTERVAL_MS + "," +
" otherwise the default value is " + DEFAULT_COMMIT_INTERVAL_MS + ".";
/** {@code repartition.purge.interval.ms} */
@SuppressWarnings("WeakerAccess")
public static final String REPARTITION_PURGE_INTERVAL_MS_CONFIG = "repartition.purge.interval.ms";
private static final String REPARTITION_PURGE_INTERVAL_MS_DOC = "The frequency in milliseconds with which to delete fully consumed records from repartition topics." +
" Purging will occur after at least this value since the last purge, but may be delayed until later." +
" (Note, unlike commit.interval.ms, the default for this value remains unchanged when processing.guarantee is set to " + EXACTLY_ONCE_V2 + ").";
/** {@code connections.max.idle.ms} */
@SuppressWarnings("WeakerAccess")
public static final String CONNECTIONS_MAX_IDLE_MS_CONFIG = CommonClientConfigs.CONNECTIONS_MAX_IDLE_MS_CONFIG;
/** {@code default.deserialization.exception.handler} */
@SuppressWarnings("WeakerAccess")
public static final String DEFAULT_DESERIALIZATION_EXCEPTION_HANDLER_CLASS_CONFIG = "default.deserialization.exception.handler";
public static final String DEFAULT_DESERIALIZATION_EXCEPTION_HANDLER_CLASS_DOC = "Exception handling class that implements the org.apache.kafka.streams.errors.DeserializationExceptionHandler interface.";
/** {@code default.production.exception.handler} */
@SuppressWarnings("WeakerAccess")
public static final String DEFAULT_PRODUCTION_EXCEPTION_HANDLER_CLASS_CONFIG = "default.production.exception.handler";
private static final String DEFAULT_PRODUCTION_EXCEPTION_HANDLER_CLASS_DOC = "Exception handling class that implements the org.apache.kafka.streams.errors.ProductionExceptionHandler interface.";
/** {@code default.dsl.store} */
@SuppressWarnings("WeakerAccess")
public static final String DEFAULT_DSL_STORE_CONFIG = "default.dsl.store";
public static final String DEFAULT_DSL_STORE_DOC = "The default state store type used by DSL operators.";
public static final String ROCKS_DB = "rocksDB";
public static final String IN_MEMORY = "in_memory";
/** {@code default.windowed.key.serde.inner} */
@SuppressWarnings("WeakerAccess")
@Deprecated
public static final String DEFAULT_WINDOWED_KEY_SERDE_INNER_CLASS = "default.windowed.key.serde.inner";
private static final String DEFAULT_WINDOWED_KEY_SERDE_INNER_CLASS_DOC = "Default serializer / deserializer for the inner class of a windowed key. Must implement the " +
"org.apache.kafka.common.serialization.Serde interface.";
/** {@code default.windowed.value.serde.inner} */
@SuppressWarnings("WeakerAccess")
@Deprecated
public static final String DEFAULT_WINDOWED_VALUE_SERDE_INNER_CLASS = "default.windowed.value.serde.inner";
private static final String DEFAULT_WINDOWED_VALUE_SERDE_INNER_CLASS_DOC = "Default serializer / deserializer for the inner class of a windowed value. Must implement the " +
"org.apache.kafka.common.serialization.Serde interface.";
public static final String WINDOWED_INNER_CLASS_SERDE = "windowed.inner.class.serde";
private static final String WINDOWED_INNER_CLASS_SERDE_DOC = " Default serializer / deserializer for the inner class of a windowed record. Must implement the \" +\n" +
" \"org.apache.kafka.common.serialization.Serde interface.. Note that setting this config in KafkaStreams application would result " +
"in an error as it is meant to be used only from Plain consumer client.";
/** {@code default key.serde} */
@SuppressWarnings("WeakerAccess")
public static final String DEFAULT_KEY_SERDE_CLASS_CONFIG = "default.key.serde";
private static final String DEFAULT_KEY_SERDE_CLASS_DOC = " Default serializer / deserializer class for key that implements the org.apache.kafka.common.serialization.Serde interface. "
+ "Note when windowed serde class is used, one needs to set the inner serde class that implements the org.apache.kafka.common.serialization.Serde interface via '"
+ DEFAULT_WINDOWED_KEY_SERDE_INNER_CLASS + "' or '" + DEFAULT_WINDOWED_VALUE_SERDE_INNER_CLASS + "' as well";
/** {@code default value.serde} */
@SuppressWarnings("WeakerAccess")
public static final String DEFAULT_VALUE_SERDE_CLASS_CONFIG = "default.value.serde";
private static final String DEFAULT_VALUE_SERDE_CLASS_DOC = "Default serializer / deserializer class for value that implements the org.apache.kafka.common.serialization.Serde interface. "
+ "Note when windowed serde class is used, one needs to set the inner serde class that implements the org.apache.kafka.common.serialization.Serde interface via '"
+ DEFAULT_WINDOWED_KEY_SERDE_INNER_CLASS + "' or '" + DEFAULT_WINDOWED_VALUE_SERDE_INNER_CLASS + "' as well";
/** {@code default.timestamp.extractor} */
@SuppressWarnings("WeakerAccess")
public static final String DEFAULT_TIMESTAMP_EXTRACTOR_CLASS_CONFIG = "default.timestamp.extractor";
public static final String DEFAULT_TIMESTAMP_EXTRACTOR_CLASS_DOC = "Default timestamp extractor class that implements the org.apache.kafka.streams.processor.TimestampExtractor interface.";
/** {@code max.task.idle.ms} */
public static final String MAX_TASK_IDLE_MS_CONFIG = "max.task.idle.ms";
public static final String MAX_TASK_IDLE_MS_DOC = "This config controls whether joins and merges"
+ " may produce out-of-order results."
+ " The config value is the maximum amount of time in milliseconds a stream task will stay idle"
+ " when it is fully caught up on some (but not all) input partitions"
+ " to wait for producers to send additional records and avoid potential"
+ " out-of-order record processing across multiple input streams."
+ " The default (zero) does not wait for producers to send more records,"
+ " but it does wait to fetch data that is already present on the brokers."
+ " This default means that for records that are already present on the brokers,"
+ " Streams will process them in timestamp order."
+ " Set to -1 to disable idling entirely and process any locally available data,"
+ " even though doing so may produce out-of-order processing.";
/** {@code max.warmup.replicas} */
public static final String MAX_WARMUP_REPLICAS_CONFIG = "max.warmup.replicas";
private static final String MAX_WARMUP_REPLICAS_DOC = "The maximum number of warmup replicas (extra standbys beyond the configured num.standbys) that can be assigned at once for the purpose of keeping " +
" the task available on one instance while it is warming up on another instance it has been reassigned to. Used to throttle how much extra broker " +
" traffic and cluster state can be used for high availability. Must be at least 1.";
/** {@code metadata.max.age.ms} */
@SuppressWarnings("WeakerAccess")
public static final String METADATA_MAX_AGE_CONFIG = CommonClientConfigs.METADATA_MAX_AGE_CONFIG;
/** {@code metrics.num.samples} */
@SuppressWarnings("WeakerAccess")
public static final String METRICS_NUM_SAMPLES_CONFIG = CommonClientConfigs.METRICS_NUM_SAMPLES_CONFIG;
/** {@code metrics.record.level} */
@SuppressWarnings("WeakerAccess")
public static final String METRICS_RECORDING_LEVEL_CONFIG = CommonClientConfigs.METRICS_RECORDING_LEVEL_CONFIG;
/** {@code metric.reporters} */
@SuppressWarnings("WeakerAccess")
public static final String METRIC_REPORTER_CLASSES_CONFIG = CommonClientConfigs.METRIC_REPORTER_CLASSES_CONFIG;
/** {@code metrics.sample.window.ms} */
@SuppressWarnings("WeakerAccess")
public static final String METRICS_SAMPLE_WINDOW_MS_CONFIG = CommonClientConfigs.METRICS_SAMPLE_WINDOW_MS_CONFIG;
/** {@code num.standby.replicas} */
@SuppressWarnings("WeakerAccess")
public static final String NUM_STANDBY_REPLICAS_CONFIG = "num.standby.replicas";
private static final String NUM_STANDBY_REPLICAS_DOC = "The number of standby replicas for each task.";
/** {@code num.stream.threads} */
@SuppressWarnings("WeakerAccess")
public static final String NUM_STREAM_THREADS_CONFIG = "num.stream.threads";
private static final String NUM_STREAM_THREADS_DOC = "The number of threads to execute stream processing.";
/** {@code poll.ms} */
@SuppressWarnings("WeakerAccess")
public static final String POLL_MS_CONFIG = "poll.ms";
private static final String POLL_MS_DOC = "The amount of time in milliseconds to block waiting for input.";
/** {@code probing.rebalance.interval.ms} */
public static final String PROBING_REBALANCE_INTERVAL_MS_CONFIG = "probing.rebalance.interval.ms";
private static final String PROBING_REBALANCE_INTERVAL_MS_DOC = "The maximum time in milliseconds to wait before triggering a rebalance to probe for warmup replicas that have finished warming up and are ready to become active." +
" Probing rebalances will continue to be triggered until the assignment is balanced. Must be at least 1 minute.";
/** {@code processing.guarantee} */
@SuppressWarnings("WeakerAccess")
public static final String PROCESSING_GUARANTEE_CONFIG = "processing.guarantee";
private static final String PROCESSING_GUARANTEE_DOC = "The processing guarantee that should be used. " +
"Possible values are " + AT_LEAST_ONCE + " (default) " +
"and " + EXACTLY_ONCE_V2 + " (requires brokers version 2.5 or higher). " +
"Deprecated options are " + EXACTLY_ONCE + " (requires brokers version 0.11.0 or higher) " +
"and " + EXACTLY_ONCE_BETA + " (requires brokers version 2.5 or higher). " +
"Note that exactly-once processing requires a cluster of at least three brokers by default what is the " +
"recommended setting for production; for development you can change this, by adjusting broker setting " +
"transaction.state.log.replication.factor and transaction.state.log.min.isr.";
/** {@code receive.buffer.bytes} */
@SuppressWarnings("WeakerAccess")
public static final String RECEIVE_BUFFER_CONFIG = CommonClientConfigs.RECEIVE_BUFFER_CONFIG;
/** {@code rack.aware.assignment.tags} */
@SuppressWarnings("WeakerAccess")
public static final String RACK_AWARE_ASSIGNMENT_TAGS_CONFIG = "rack.aware.assignment.tags";
private static final String RACK_AWARE_ASSIGNMENT_TAGS_DOC = "List of client tag keys used to distribute standby replicas across Kafka Streams instances." +
" When configured, Kafka Streams will make a best-effort to distribute" +
" the standby tasks over each client tag dimension.";
/** {@code reconnect.backoff.ms} */
@SuppressWarnings("WeakerAccess")
public static final String RECONNECT_BACKOFF_MS_CONFIG = CommonClientConfigs.RECONNECT_BACKOFF_MS_CONFIG;
/** {@code reconnect.backoff.max} */
@SuppressWarnings("WeakerAccess")
public static final String RECONNECT_BACKOFF_MAX_MS_CONFIG = CommonClientConfigs.RECONNECT_BACKOFF_MAX_MS_CONFIG;
/** {@code replication.factor} */
@SuppressWarnings("WeakerAccess")
public static final String REPLICATION_FACTOR_CONFIG = "replication.factor";
private static final String REPLICATION_FACTOR_DOC = "The replication factor for change log topics and repartition topics created by the stream processing application."
+ " The default of -1 (meaning: use broker default replication factor) requires broker version 2.4 or newer";
/** {@code request.timeout.ms} */
@SuppressWarnings("WeakerAccess")
public static final String REQUEST_TIMEOUT_MS_CONFIG = CommonClientConfigs.REQUEST_TIMEOUT_MS_CONFIG;
/**
* {@code retries}
*
* This config is ignored by Kafka Streams. Note, that the internal clients (producer, admin) are still impacted by this config.
*
* @deprecated since 2.7
*/
@SuppressWarnings("WeakerAccess")
@Deprecated
public static final String RETRIES_CONFIG = CommonClientConfigs.RETRIES_CONFIG;
/** {@code retry.backoff.ms} */
@SuppressWarnings("WeakerAccess")
public static final String RETRY_BACKOFF_MS_CONFIG = CommonClientConfigs.RETRY_BACKOFF_MS_CONFIG;
/** {@code rocksdb.config.setter} */
@SuppressWarnings("WeakerAccess")
public static final String ROCKSDB_CONFIG_SETTER_CLASS_CONFIG = "rocksdb.config.setter";
private static final String ROCKSDB_CONFIG_SETTER_CLASS_DOC = "A Rocks DB config setter class or class name that implements the org.apache.kafka.streams.state.RocksDBConfigSetter interface";
/** {@code security.protocol} */
@SuppressWarnings("WeakerAccess")
public static final String SECURITY_PROTOCOL_CONFIG = CommonClientConfigs.SECURITY_PROTOCOL_CONFIG;
/** {@code send.buffer.bytes} */
@SuppressWarnings("WeakerAccess")
public static final String SEND_BUFFER_CONFIG = CommonClientConfigs.SEND_BUFFER_CONFIG;
/** {@code state.cleanup.delay} */
@SuppressWarnings("WeakerAccess")
public static final String STATE_CLEANUP_DELAY_MS_CONFIG = "state.cleanup.delay.ms";
private static final String STATE_CLEANUP_DELAY_MS_DOC = "The amount of time in milliseconds to wait before deleting state when a partition has migrated. Only state directories that have not been modified for at least state.cleanup.delay.ms will be removed";
/** {@code state.dir} */
@SuppressWarnings("WeakerAccess")
public static final String STATE_DIR_CONFIG = "state.dir";
private static final String STATE_DIR_DOC = "Directory location for state store. This path must be unique for each streams instance sharing the same underlying filesystem.";
/** {@code task.timeout.ms} */
public static final String TASK_TIMEOUT_MS_CONFIG = "task.timeout.ms";
public static final String TASK_TIMEOUT_MS_DOC = "The maximum amount of time in milliseconds a task might stall due to internal errors and retries until an error is raised. " +
"For a timeout of 0ms, a task would raise an error for the first internal error. " +
"For any timeout larger than 0ms, a task will retry at least once before an error is raised.";
/** {@code topology.optimization} */
public static final String TOPOLOGY_OPTIMIZATION_CONFIG = "topology.optimization";
private static final String TOPOLOGY_OPTIMIZATION_DOC = "A configuration telling Kafka Streams if it should optimize the topology, disabled by default";
/** {@code window.size.ms} */
public static final String WINDOW_SIZE_MS_CONFIG = "window.size.ms";
private static final String WINDOW_SIZE_MS_DOC = "Sets window size for the deserializer in order to calculate window end times.";
/** {@code upgrade.from} */
@SuppressWarnings("WeakerAccess")
public static final String UPGRADE_FROM_CONFIG = "upgrade.from";
private static final String UPGRADE_FROM_DOC = "Allows upgrading in a backward compatible way. " +
"This is needed when upgrading from [0.10.0, 1.1] to 2.0+, or when upgrading from [2.0, 2.3] to 2.4+. " +
"When upgrading from 2.4 to a newer version it is not required to specify this config. Default is `null`. " +
"Accepted values are \"" + UPGRADE_FROM_0100 + "\", \"" + UPGRADE_FROM_0101 + "\", \"" +
UPGRADE_FROM_0102 + "\", \"" + UPGRADE_FROM_0110 + "\", \"" + UPGRADE_FROM_10 + "\", \"" +
UPGRADE_FROM_11 + "\", \"" + UPGRADE_FROM_20 + "\", \"" + UPGRADE_FROM_21 + "\", \"" +
UPGRADE_FROM_22 + "\", \"" + UPGRADE_FROM_23 + "\" (for upgrading from the corresponding old version).";
/** {@code windowstore.changelog.additional.retention.ms} */
@SuppressWarnings("WeakerAccess")
public static final String WINDOW_STORE_CHANGE_LOG_ADDITIONAL_RETENTION_MS_CONFIG = "windowstore.changelog.additional.retention.ms";
private static final String WINDOW_STORE_CHANGE_LOG_ADDITIONAL_RETENTION_MS_DOC = "Added to a windows maintainMs to ensure data is not deleted from the log prematurely. Allows for clock drift. Default is 1 day";
/**
* {@code topology.optimization}
* @deprecated since 2.7; use {@link #TOPOLOGY_OPTIMIZATION_CONFIG} instead
*/
@Deprecated
public static final String TOPOLOGY_OPTIMIZATION = TOPOLOGY_OPTIMIZATION_CONFIG;
private static final String[] NON_CONFIGURABLE_CONSUMER_DEFAULT_CONFIGS =
new String[] {ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG};
private static final String[] NON_CONFIGURABLE_CONSUMER_EOS_CONFIGS =
new String[] {ConsumerConfig.ISOLATION_LEVEL_CONFIG};
private static final String[] NON_CONFIGURABLE_PRODUCER_EOS_CONFIGS =
new String[] {
ProducerConfig.ENABLE_IDEMPOTENCE_CONFIG,
ProducerConfig.MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION,
ProducerConfig.TRANSACTIONAL_ID_CONFIG
};
static {
CONFIG = new ConfigDef()
// HIGH
.define(APPLICATION_ID_CONFIG, // required with no default value
Type.STRING,
Importance.HIGH,
APPLICATION_ID_DOC)
.define(BOOTSTRAP_SERVERS_CONFIG, // required with no default value
Type.LIST,
Importance.HIGH,
CommonClientConfigs.BOOTSTRAP_SERVERS_DOC)
.define(NUM_STANDBY_REPLICAS_CONFIG,
Type.INT,
0,
Importance.HIGH,
NUM_STANDBY_REPLICAS_DOC)
.define(STATE_DIR_CONFIG,
Type.STRING,
System.getProperty("java.io.tmpdir") + File.separator + "kafka-streams",
Importance.HIGH,
STATE_DIR_DOC)
// MEDIUM
.define(ACCEPTABLE_RECOVERY_LAG_CONFIG,
Type.LONG,
10_000L,
atLeast(0),
Importance.MEDIUM,
ACCEPTABLE_RECOVERY_LAG_DOC)
.define(CACHE_MAX_BYTES_BUFFERING_CONFIG,
Type.LONG,
10 * 1024 * 1024L,
atLeast(0),
Importance.MEDIUM,
CACHE_MAX_BYTES_BUFFERING_DOC)
.define(CLIENT_ID_CONFIG,
Type.STRING,
"",
Importance.MEDIUM,
CLIENT_ID_DOC)
.define(DEFAULT_DESERIALIZATION_EXCEPTION_HANDLER_CLASS_CONFIG,
Type.CLASS,
LogAndFailExceptionHandler.class.getName(),
Importance.MEDIUM,
DEFAULT_DESERIALIZATION_EXCEPTION_HANDLER_CLASS_DOC)
.define(DEFAULT_KEY_SERDE_CLASS_CONFIG,
Type.CLASS,
null,
Importance.MEDIUM,
DEFAULT_KEY_SERDE_CLASS_DOC)
.define(CommonClientConfigs.DEFAULT_LIST_KEY_SERDE_INNER_CLASS,
Type.CLASS,
null,
Importance.MEDIUM,
CommonClientConfigs.DEFAULT_LIST_KEY_SERDE_INNER_CLASS_DOC)
.define(CommonClientConfigs.DEFAULT_LIST_VALUE_SERDE_INNER_CLASS,
Type.CLASS,
null,
Importance.MEDIUM,
CommonClientConfigs.DEFAULT_LIST_VALUE_SERDE_INNER_CLASS_DOC)
.define(CommonClientConfigs.DEFAULT_LIST_KEY_SERDE_TYPE_CLASS,
Type.CLASS,
null,
Importance.MEDIUM,
CommonClientConfigs.DEFAULT_LIST_KEY_SERDE_TYPE_CLASS_DOC)
.define(CommonClientConfigs.DEFAULT_LIST_VALUE_SERDE_TYPE_CLASS,
Type.CLASS,
null,
Importance.MEDIUM,
CommonClientConfigs.DEFAULT_LIST_VALUE_SERDE_TYPE_CLASS_DOC)
.define(DEFAULT_PRODUCTION_EXCEPTION_HANDLER_CLASS_CONFIG,
Type.CLASS,
DefaultProductionExceptionHandler.class.getName(),
Importance.MEDIUM,
DEFAULT_PRODUCTION_EXCEPTION_HANDLER_CLASS_DOC)
.define(DEFAULT_TIMESTAMP_EXTRACTOR_CLASS_CONFIG,
Type.CLASS,
FailOnInvalidTimestamp.class.getName(),
Importance.MEDIUM,
DEFAULT_TIMESTAMP_EXTRACTOR_CLASS_DOC)
.define(DEFAULT_VALUE_SERDE_CLASS_CONFIG,
Type.CLASS,
null,
Importance.MEDIUM,
DEFAULT_VALUE_SERDE_CLASS_DOC)
.define(MAX_TASK_IDLE_MS_CONFIG,
Type.LONG,
0L,
Importance.MEDIUM,
MAX_TASK_IDLE_MS_DOC)
.define(MAX_WARMUP_REPLICAS_CONFIG,
Type.INT,
2,
atLeast(1),
Importance.MEDIUM,
MAX_WARMUP_REPLICAS_DOC)
.define(NUM_STREAM_THREADS_CONFIG,
Type.INT,
1,
Importance.MEDIUM,
NUM_STREAM_THREADS_DOC)
.define(PROCESSING_GUARANTEE_CONFIG,
Type.STRING,
AT_LEAST_ONCE,
in(AT_LEAST_ONCE, EXACTLY_ONCE, EXACTLY_ONCE_BETA, EXACTLY_ONCE_V2),
Importance.MEDIUM,
PROCESSING_GUARANTEE_DOC)
.define(RACK_AWARE_ASSIGNMENT_TAGS_CONFIG,
Type.LIST,
Collections.emptyList(),
atMostOfSize(MAX_RACK_AWARE_ASSIGNMENT_TAG_LIST_SIZE),
Importance.MEDIUM,
RACK_AWARE_ASSIGNMENT_TAGS_DOC)
.define(REPLICATION_FACTOR_CONFIG,
Type.INT,
-1,
Importance.MEDIUM,
REPLICATION_FACTOR_DOC)
.define(SECURITY_PROTOCOL_CONFIG,
Type.STRING,
CommonClientConfigs.DEFAULT_SECURITY_PROTOCOL,
Importance.MEDIUM,
CommonClientConfigs.SECURITY_PROTOCOL_DOC)
.define(TASK_TIMEOUT_MS_CONFIG,
Type.LONG,
Duration.ofMinutes(5L).toMillis(),
atLeast(0L),
Importance.MEDIUM,
TASK_TIMEOUT_MS_DOC)
.define(TOPOLOGY_OPTIMIZATION_CONFIG,
Type.STRING,
NO_OPTIMIZATION,
in(NO_OPTIMIZATION, OPTIMIZE),
Importance.MEDIUM,
TOPOLOGY_OPTIMIZATION_DOC)
// LOW
.define(APPLICATION_SERVER_CONFIG,
Type.STRING,
"",
Importance.LOW,
APPLICATION_SERVER_DOC)
.define(BUFFERED_RECORDS_PER_PARTITION_CONFIG,
Type.INT,
1000,
Importance.LOW,
BUFFERED_RECORDS_PER_PARTITION_DOC)
.define(BUILT_IN_METRICS_VERSION_CONFIG,
Type.STRING,
METRICS_LATEST,
in(
METRICS_LATEST
),
Importance.LOW,
BUILT_IN_METRICS_VERSION_DOC)
.define(COMMIT_INTERVAL_MS_CONFIG,
Type.LONG,
DEFAULT_COMMIT_INTERVAL_MS,
atLeast(0),
Importance.LOW,
COMMIT_INTERVAL_MS_DOC)
.define(REPARTITION_PURGE_INTERVAL_MS_CONFIG,
Type.LONG,
DEFAULT_COMMIT_INTERVAL_MS,
atLeast(0),
Importance.LOW,
REPARTITION_PURGE_INTERVAL_MS_DOC)
.define(CONNECTIONS_MAX_IDLE_MS_CONFIG,
ConfigDef.Type.LONG,
9 * 60 * 1000L,
ConfigDef.Importance.LOW,
CommonClientConfigs.CONNECTIONS_MAX_IDLE_MS_DOC)
.define(DEFAULT_DSL_STORE_CONFIG,
Type.STRING,
ROCKS_DB,
in(ROCKS_DB, IN_MEMORY),
Importance.LOW,
DEFAULT_DSL_STORE_DOC)
.define(METADATA_MAX_AGE_CONFIG,
ConfigDef.Type.LONG,
5 * 60 * 1000L,
atLeast(0),
ConfigDef.Importance.LOW,
CommonClientConfigs.METADATA_MAX_AGE_DOC)
.define(METRICS_NUM_SAMPLES_CONFIG,
Type.INT,
2,
atLeast(1),
Importance.LOW,
CommonClientConfigs.METRICS_NUM_SAMPLES_DOC)
.define(METRIC_REPORTER_CLASSES_CONFIG,
Type.LIST,
"",
Importance.LOW,
CommonClientConfigs.METRIC_REPORTER_CLASSES_DOC)
.define(METRICS_RECORDING_LEVEL_CONFIG,
Type.STRING,
Sensor.RecordingLevel.INFO.toString(),
in(Sensor.RecordingLevel.INFO.toString(), Sensor.RecordingLevel.DEBUG.toString(), RecordingLevel.TRACE.toString()),
Importance.LOW,
CommonClientConfigs.METRICS_RECORDING_LEVEL_DOC)
.define(METRICS_SAMPLE_WINDOW_MS_CONFIG,
Type.LONG,
30000L,
atLeast(0),
Importance.LOW,
CommonClientConfigs.METRICS_SAMPLE_WINDOW_MS_DOC)
.define(POLL_MS_CONFIG,
Type.LONG,
100L,
Importance.LOW,
POLL_MS_DOC)
.define(PROBING_REBALANCE_INTERVAL_MS_CONFIG,
Type.LONG,
10 * 60 * 1000L,
atLeast(60 * 1000L),
Importance.LOW,
PROBING_REBALANCE_INTERVAL_MS_DOC)
.define(RECEIVE_BUFFER_CONFIG,
Type.INT,
32 * 1024,
atLeast(CommonClientConfigs.RECEIVE_BUFFER_LOWER_BOUND),
Importance.LOW,
CommonClientConfigs.RECEIVE_BUFFER_DOC)
.define(RECONNECT_BACKOFF_MS_CONFIG,
Type.LONG,
50L,
atLeast(0L),
Importance.LOW,
CommonClientConfigs.RECONNECT_BACKOFF_MS_DOC)
.define(RECONNECT_BACKOFF_MAX_MS_CONFIG,
Type.LONG,
1000L,
atLeast(0L),
ConfigDef.Importance.LOW,
CommonClientConfigs.RECONNECT_BACKOFF_MAX_MS_DOC)
.define(RETRIES_CONFIG,
Type.INT,
0,
between(0, Integer.MAX_VALUE),
ConfigDef.Importance.LOW,
CommonClientConfigs.RETRIES_DOC)
.define(RETRY_BACKOFF_MS_CONFIG,
Type.LONG,
100L,
atLeast(0L),
ConfigDef.Importance.LOW,
CommonClientConfigs.RETRY_BACKOFF_MS_DOC)
.define(REQUEST_TIMEOUT_MS_CONFIG,
Type.INT,
40 * 1000,
atLeast(0),
ConfigDef.Importance.LOW,
CommonClientConfigs.REQUEST_TIMEOUT_MS_DOC)
.define(ROCKSDB_CONFIG_SETTER_CLASS_CONFIG,
Type.CLASS,
null,
Importance.LOW,
ROCKSDB_CONFIG_SETTER_CLASS_DOC)
.define(SEND_BUFFER_CONFIG,
Type.INT,
128 * 1024,
atLeast(CommonClientConfigs.SEND_BUFFER_LOWER_BOUND),
Importance.LOW,
CommonClientConfigs.SEND_BUFFER_DOC)
.define(STATE_CLEANUP_DELAY_MS_CONFIG,
Type.LONG,
10 * 60 * 1000L,
Importance.LOW,
STATE_CLEANUP_DELAY_MS_DOC)
.define(UPGRADE_FROM_CONFIG,
ConfigDef.Type.STRING,
null,
in(null,
UPGRADE_FROM_0100,
UPGRADE_FROM_0101,
UPGRADE_FROM_0102,
UPGRADE_FROM_0110,
UPGRADE_FROM_10,
UPGRADE_FROM_11,
UPGRADE_FROM_20,
UPGRADE_FROM_21,
UPGRADE_FROM_22,
UPGRADE_FROM_23),
Importance.LOW,
UPGRADE_FROM_DOC)
.define(WINDOWED_INNER_CLASS_SERDE,
Type.STRING,
null,
Importance.LOW,
WINDOWED_INNER_CLASS_SERDE_DOC)
.define(WINDOW_STORE_CHANGE_LOG_ADDITIONAL_RETENTION_MS_CONFIG,
Type.LONG,
24 * 60 * 60 * 1000L,
Importance.LOW,
WINDOW_STORE_CHANGE_LOG_ADDITIONAL_RETENTION_MS_DOC)
.define(WINDOW_SIZE_MS_CONFIG,
Type.LONG,
null,
Importance.LOW,
WINDOW_SIZE_MS_DOC);
}
// this is the list of configs for underlying clients
// that streams prefer different default values
private static final Map PRODUCER_DEFAULT_OVERRIDES;
static {
final Map tempProducerDefaultOverrides = new HashMap<>();
tempProducerDefaultOverrides.put(ProducerConfig.LINGER_MS_CONFIG, "100");
PRODUCER_DEFAULT_OVERRIDES = Collections.unmodifiableMap(tempProducerDefaultOverrides);
}
private static final Map PRODUCER_EOS_OVERRIDES;
static {
final Map tempProducerDefaultOverrides = new HashMap<>(PRODUCER_DEFAULT_OVERRIDES);
tempProducerDefaultOverrides.put(ProducerConfig.DELIVERY_TIMEOUT_MS_CONFIG, Integer.MAX_VALUE);
tempProducerDefaultOverrides.put(ProducerConfig.ENABLE_IDEMPOTENCE_CONFIG, true);
// Reduce the transaction timeout for quicker pending offset expiration on broker side.
tempProducerDefaultOverrides.put(ProducerConfig.TRANSACTION_TIMEOUT_CONFIG, DEFAULT_TRANSACTION_TIMEOUT);
PRODUCER_EOS_OVERRIDES = Collections.unmodifiableMap(tempProducerDefaultOverrides);
}
private static final Map CONSUMER_DEFAULT_OVERRIDES;
static {
final Map tempConsumerDefaultOverrides = new HashMap<>();
tempConsumerDefaultOverrides.put(ConsumerConfig.MAX_POLL_RECORDS_CONFIG, "1000");
tempConsumerDefaultOverrides.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
tempConsumerDefaultOverrides.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, "false");
tempConsumerDefaultOverrides.put("internal.leave.group.on.close", false);
CONSUMER_DEFAULT_OVERRIDES = Collections.unmodifiableMap(tempConsumerDefaultOverrides);
}
private static final Map CONSUMER_EOS_OVERRIDES;
static {
final Map tempConsumerDefaultOverrides = new HashMap<>(CONSUMER_DEFAULT_OVERRIDES);
tempConsumerDefaultOverrides.put(ConsumerConfig.ISOLATION_LEVEL_CONFIG, READ_COMMITTED.name().toLowerCase(Locale.ROOT));
CONSUMER_EOS_OVERRIDES = Collections.unmodifiableMap(tempConsumerDefaultOverrides);
}
public static class InternalConfig {
// This is settable in the main Streams config, but it's a private API for now
public static final String INTERNAL_TASK_ASSIGNOR_CLASS = "internal.task.assignor.class";
// These are not settable in the main Streams config; they are set by the StreamThread to pass internal
// state into the assignor.
public static final String REFERENCE_CONTAINER_PARTITION_ASSIGNOR = "__reference.container.instance__";
// This is settable in the main Streams config, but it's a private API for testing
public static final String ASSIGNMENT_LISTENER = "__assignment.listener__";
// Private API used to control the emit latency for left/outer join results (https://issues.apache.org/jira/browse/KAFKA-10847)
public static final String EMIT_INTERVAL_MS_KSTREAMS_OUTER_JOIN_SPURIOUS_RESULTS_FIX = "__emit.interval.ms.kstreams.outer.join.spurious.results.fix__";
// Private API used to control the usage of consistency offset vectors
public static final String IQ_CONSISTENCY_OFFSET_VECTOR_ENABLED = "__iq.consistency.offset"
+ ".vector.enabled__";
// Private API used to control the prefix of the auto created topics
public static final String TOPIC_PREFIX_ALTERNATIVE = "__internal.override.topic.prefix__";
public static boolean getBoolean(final Map configs, final String key, final boolean defaultValue) {
final Object value = configs.getOrDefault(key, defaultValue);
if (value instanceof Boolean) {
return (boolean) value;
} else if (value instanceof String) {
return Boolean.parseBoolean((String) value);
} else {
log.warn("Invalid value (" + value + ") on internal configuration '" + key + "'. Please specify a true/false value.");
return defaultValue;
}
}
public static long getLong(final Map configs, final String key, final long defaultValue) {
final Object value = configs.getOrDefault(key, defaultValue);
if (value instanceof Number) {
return ((Number) value).longValue();
} else if (value instanceof String) {
return Long.parseLong((String) value);
} else {
log.warn("Invalid value (" + value + ") on internal configuration '" + key + "'. Please specify a numeric value.");
return defaultValue;
}
}
public static String getString(final Map configs, final String key, final String defaultValue) {
final Object value = configs.getOrDefault(key, defaultValue);
if (value instanceof String) {
return (String) value;
} else {
log.warn("Invalid value (" + value + ") on internal configuration '" + key + "'. Please specify a String value.");
return defaultValue;
}
}
}
/**
* Prefix a property with {@link #CONSUMER_PREFIX}. This is used to isolate {@link ConsumerConfig consumer configs}
* from other client configs.
*
* @param consumerProp the consumer property to be masked
* @return {@link #CONSUMER_PREFIX} + {@code consumerProp}
*/
@SuppressWarnings("WeakerAccess")
public static String consumerPrefix(final String consumerProp) {
return CONSUMER_PREFIX + consumerProp;
}
/**
* Prefix a property with {@link #MAIN_CONSUMER_PREFIX}. This is used to isolate {@link ConsumerConfig main consumer configs}
* from other client configs.
*
* @param consumerProp the consumer property to be masked
* @return {@link #MAIN_CONSUMER_PREFIX} + {@code consumerProp}
*/
@SuppressWarnings("WeakerAccess")
public static String mainConsumerPrefix(final String consumerProp) {
return MAIN_CONSUMER_PREFIX + consumerProp;
}
/**
* Prefix a property with {@link #RESTORE_CONSUMER_PREFIX}. This is used to isolate {@link ConsumerConfig restore consumer configs}
* from other client configs.
*
* @param consumerProp the consumer property to be masked
* @return {@link #RESTORE_CONSUMER_PREFIX} + {@code consumerProp}
*/
@SuppressWarnings("WeakerAccess")
public static String restoreConsumerPrefix(final String consumerProp) {
return RESTORE_CONSUMER_PREFIX + consumerProp;
}
/**
* Prefix a client tag key with {@link #CLIENT_TAG_PREFIX}.
*
* @param clientTagKey client tag key
* @return {@link #CLIENT_TAG_PREFIX} + {@code clientTagKey}
*/
public static String clientTagPrefix(final String clientTagKey) {
return CLIENT_TAG_PREFIX + clientTagKey;
}
/**
* Prefix a property with {@link #GLOBAL_CONSUMER_PREFIX}. This is used to isolate {@link ConsumerConfig global consumer configs}
* from other client configs.
*
* @param consumerProp the consumer property to be masked
* @return {@link #GLOBAL_CONSUMER_PREFIX} + {@code consumerProp}
*/
@SuppressWarnings("WeakerAccess")
public static String globalConsumerPrefix(final String consumerProp) {
return GLOBAL_CONSUMER_PREFIX + consumerProp;
}
/**
* Prefix a property with {@link #PRODUCER_PREFIX}. This is used to isolate {@link ProducerConfig producer configs}
* from other client configs.
*
* @param producerProp the producer property to be masked
* @return PRODUCER_PREFIX + {@code producerProp}
*/
@SuppressWarnings("WeakerAccess")
public static String producerPrefix(final String producerProp) {
return PRODUCER_PREFIX + producerProp;
}
/**
* Prefix a property with {@link #ADMIN_CLIENT_PREFIX}. This is used to isolate {@link AdminClientConfig admin configs}
* from other client configs.
*
* @param adminClientProp the admin client property to be masked
* @return ADMIN_CLIENT_PREFIX + {@code adminClientProp}
*/
@SuppressWarnings("WeakerAccess")
public static String adminClientPrefix(final String adminClientProp) {
return ADMIN_CLIENT_PREFIX + adminClientProp;
}
/**
* Prefix a property with {@link #TOPIC_PREFIX}
* used to provide default topic configs to be applied when creating internal topics.
*
* @param topicProp the topic property to be masked
* @return TOPIC_PREFIX + {@code topicProp}
*/
@SuppressWarnings("WeakerAccess")
public static String topicPrefix(final String topicProp) {
return TOPIC_PREFIX + topicProp;
}
/**
* Return a copy of the config definition.
*
* @return a copy of the config definition
*/
@SuppressWarnings("unused")
public static ConfigDef configDef() {
return new ConfigDef(CONFIG);
}
/**
* Create a new {@code StreamsConfig} using the given properties.
*
* @param props properties that specify Kafka Streams and internal consumer/producer configuration
*/
public StreamsConfig(final Map props) {
this(props, true);
}
protected StreamsConfig(final Map props,
final boolean doLog) {
super(CONFIG, props, doLog);
eosEnabled = StreamsConfigUtils.eosEnabled(this);
final String processingModeConfig = getString(StreamsConfig.PROCESSING_GUARANTEE_CONFIG);
if (processingModeConfig.equals(EXACTLY_ONCE)) {
log.warn("Configuration parameter `{}` is deprecated and will be removed in the 4.0.0 release. " +
"Please use `{}` instead. Note that this requires broker version 2.5+ so you should prepare "
+ "to upgrade your brokers if necessary.", EXACTLY_ONCE, EXACTLY_ONCE_V2);
}
if (processingModeConfig.equals(EXACTLY_ONCE_BETA)) {
log.warn("Configuration parameter `{}` is deprecated and will be removed in the 4.0.0 release. " +
"Please use `{}` instead.", EXACTLY_ONCE_BETA, EXACTLY_ONCE_V2);
}
if (props.containsKey(RETRIES_CONFIG)) {
log.warn("Configuration parameter `{}` is deprecated and will be removed in the 4.0.0 release.", RETRIES_CONFIG);
}
if (eosEnabled) {
verifyEOSTransactionTimeoutCompatibility();
}
}
private void verifyEOSTransactionTimeoutCompatibility() {
final long commitInterval = getLong(COMMIT_INTERVAL_MS_CONFIG);
final String transactionTimeoutConfigKey = producerPrefix(ProducerConfig.TRANSACTION_TIMEOUT_CONFIG);
final int transactionTimeout = originals().containsKey(transactionTimeoutConfigKey) ? (int) parseType(
transactionTimeoutConfigKey, originals().get(transactionTimeoutConfigKey), Type.INT) : DEFAULT_TRANSACTION_TIMEOUT;
if (transactionTimeout < commitInterval) {
throw new IllegalArgumentException(String.format("Transaction timeout %d was set lower than " +
"streams commit interval %d. This will cause ongoing transaction always timeout due to inactivity " +
"caused by long commit interval. Consider reconfiguring commit interval to match " +
"transaction timeout by tuning 'commit.interval.ms' config, or increase the transaction timeout to match " +
"commit interval by tuning `producer.transaction.timeout.ms` config.",
transactionTimeout, commitInterval));
}
}
@Override
protected Map postProcessParsedConfig(final Map parsedValues) {
final Map configUpdates =
CommonClientConfigs.postProcessReconnectBackoffConfigs(this, parsedValues);
if (StreamsConfigUtils.eosEnabled(this) && !originals().containsKey(COMMIT_INTERVAL_MS_CONFIG)) {
log.debug("Using {} default value of {} as exactly once is enabled.",
COMMIT_INTERVAL_MS_CONFIG, EOS_DEFAULT_COMMIT_INTERVAL_MS);
configUpdates.put(COMMIT_INTERVAL_MS_CONFIG, EOS_DEFAULT_COMMIT_INTERVAL_MS);
}
validateRackAwarenessConfiguration();
return configUpdates;
}
private void validateRackAwarenessConfiguration() {
final List rackAwareAssignmentTags = getList(RACK_AWARE_ASSIGNMENT_TAGS_CONFIG);
final Map clientTags = getClientTags();
if (clientTags.size() > MAX_RACK_AWARE_ASSIGNMENT_TAG_LIST_SIZE) {
throw new ConfigException("At most " + MAX_RACK_AWARE_ASSIGNMENT_TAG_LIST_SIZE + " client tags " +
"can be specified using " + CLIENT_TAG_PREFIX + " prefix.");
}
for (final String rackAwareAssignmentTag : rackAwareAssignmentTags) {
if (!clientTags.containsKey(rackAwareAssignmentTag)) {
throw new ConfigException(RACK_AWARE_ASSIGNMENT_TAGS_CONFIG,
rackAwareAssignmentTags,
"Contains invalid value [" + rackAwareAssignmentTag + "] " +
"which doesn't have corresponding tag set via [" + CLIENT_TAG_PREFIX + "] prefix.");
}
}
clientTags.forEach((tagKey, tagValue) -> {
if (tagKey.length() > MAX_RACK_AWARE_ASSIGNMENT_TAG_KEY_LENGTH) {
throw new ConfigException(CLIENT_TAG_PREFIX,
tagKey,
"Tag key exceeds maximum length of " + MAX_RACK_AWARE_ASSIGNMENT_TAG_KEY_LENGTH + ".");
}
if (tagValue.length() > MAX_RACK_AWARE_ASSIGNMENT_TAG_VALUE_LENGTH) {
throw new ConfigException(CLIENT_TAG_PREFIX,
tagValue,
"Tag value exceeds maximum length of " + MAX_RACK_AWARE_ASSIGNMENT_TAG_VALUE_LENGTH + ".");
}
});
}
private Map getCommonConsumerConfigs() {
final Map clientProvidedProps = getClientPropsWithPrefix(CONSUMER_PREFIX, ConsumerConfig.configNames());
checkIfUnexpectedUserSpecifiedConsumerConfig(clientProvidedProps, NON_CONFIGURABLE_CONSUMER_DEFAULT_CONFIGS);
checkIfUnexpectedUserSpecifiedConsumerConfig(clientProvidedProps, NON_CONFIGURABLE_CONSUMER_EOS_CONFIGS);
final Map consumerProps = new HashMap<>(eosEnabled ? CONSUMER_EOS_OVERRIDES : CONSUMER_DEFAULT_OVERRIDES);
if (StreamsConfigUtils.processingMode(this) == StreamsConfigUtils.ProcessingMode.EXACTLY_ONCE_V2) {
consumerProps.put("internal.throw.on.fetch.stable.offset.unsupported", true);
}
consumerProps.putAll(getClientCustomProps());
consumerProps.putAll(clientProvidedProps);
// bootstrap.servers should be from StreamsConfig
consumerProps.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, originals().get(BOOTSTRAP_SERVERS_CONFIG));
return consumerProps;
}
private void checkIfUnexpectedUserSpecifiedConsumerConfig(final Map clientProvidedProps,
final String[] nonConfigurableConfigs) {
// Streams does not allow users to configure certain consumer/producer configurations, for example,
// enable.auto.commit. In cases where user tries to override such non-configurable
// consumer/producer configurations, log a warning and remove the user defined value from the Map.
// Thus the default values for these consumer/producer configurations that are suitable for
// Streams will be used instead.
final String nonConfigurableConfigMessage = "Unexpected user-specified %s config: %s found. %sUser setting (%s) will be ignored and the Streams default setting (%s) will be used ";
final String eosMessage = PROCESSING_GUARANTEE_CONFIG + " is set to " + getString(PROCESSING_GUARANTEE_CONFIG) + ". Hence, ";
for (final String config: nonConfigurableConfigs) {
if (clientProvidedProps.containsKey(config)) {
if (CONSUMER_DEFAULT_OVERRIDES.containsKey(config)) {
if (!clientProvidedProps.get(config).equals(CONSUMER_DEFAULT_OVERRIDES.get(config))) {
log.warn(String.format(nonConfigurableConfigMessage, "consumer", config, "", clientProvidedProps.get(config), CONSUMER_DEFAULT_OVERRIDES.get(config)));
clientProvidedProps.remove(config);
}
} else if (eosEnabled) {
if (CONSUMER_EOS_OVERRIDES.containsKey(config)) {
if (!clientProvidedProps.get(config).equals(CONSUMER_EOS_OVERRIDES.get(config))) {
log.warn(String.format(nonConfigurableConfigMessage,
"consumer", config, eosMessage, clientProvidedProps.get(config), CONSUMER_EOS_OVERRIDES.get(config)));
clientProvidedProps.remove(config);
}
} else if (PRODUCER_EOS_OVERRIDES.containsKey(config)) {
if (!clientProvidedProps.get(config).equals(PRODUCER_EOS_OVERRIDES.get(config))) {
log.warn(String.format(nonConfigurableConfigMessage,
"producer", config, eosMessage, clientProvidedProps.get(config), PRODUCER_EOS_OVERRIDES.get(config)));
clientProvidedProps.remove(config);
}
} else if (ProducerConfig.TRANSACTIONAL_ID_CONFIG.equals(config)) {
log.warn(String.format(nonConfigurableConfigMessage,
"producer", config, eosMessage, clientProvidedProps.get(config), "-"));
clientProvidedProps.remove(config);
}
}
}
}
if (eosEnabled) {
verifyMaxInFlightRequestPerConnection(clientProvidedProps.get(ProducerConfig.MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION));
}
}
private void verifyMaxInFlightRequestPerConnection(final Object maxInFlightRequests) {
if (maxInFlightRequests != null) {
final int maxInFlightRequestsAsInteger;
if (maxInFlightRequests instanceof Integer) {
maxInFlightRequestsAsInteger = (Integer) maxInFlightRequests;
} else if (maxInFlightRequests instanceof String) {
try {
maxInFlightRequestsAsInteger = Integer.parseInt(((String) maxInFlightRequests).trim());
} catch (final NumberFormatException e) {
throw new ConfigException(ProducerConfig.MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION, maxInFlightRequests, "String value could not be parsed as 32-bit integer");
}
} else {
throw new ConfigException(ProducerConfig.MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION, maxInFlightRequests, "Expected value to be a 32-bit integer, but it was a " + maxInFlightRequests.getClass().getName());
}
if (maxInFlightRequestsAsInteger > 5) {
throw new ConfigException(ProducerConfig.MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION, maxInFlightRequestsAsInteger, "Can't exceed 5 when exactly-once processing is enabled");
}
}
}
/**
* Get the configs to the {@link KafkaConsumer main consumer}.
* Properties using the prefix {@link #MAIN_CONSUMER_PREFIX} will be used in favor over
* the properties prefixed with {@link #CONSUMER_PREFIX} and the non-prefixed versions
* (read the override precedence ordering in {@link #MAIN_CONSUMER_PREFIX}
* except in the case of {@link ConsumerConfig#BOOTSTRAP_SERVERS_CONFIG} where we always use the non-prefixed
* version as we only support reading/writing from/to the same Kafka Cluster.
* If not specified by {@link #MAIN_CONSUMER_PREFIX}, main consumer will share the general consumer configs
* prefixed by {@link #CONSUMER_PREFIX}.
*
* @param groupId consumer groupId
* @param clientId clientId
* @param threadIdx stream thread index
* @return Map of the consumer configuration.
*/
@SuppressWarnings("WeakerAccess")
public Map getMainConsumerConfigs(final String groupId, final String clientId, final int threadIdx) {
final Map consumerProps = getCommonConsumerConfigs();
// Get main consumer override configs
final Map mainConsumerProps = originalsWithPrefix(MAIN_CONSUMER_PREFIX);
for (final Map.Entry entry: mainConsumerProps.entrySet()) {
consumerProps.put(entry.getKey(), entry.getValue());
}
// this is a hack to work around StreamsConfig constructor inside StreamsPartitionAssignor to avoid casting
consumerProps.put(APPLICATION_ID_CONFIG, groupId);
// add group id, client id with stream client id prefix, and group instance id
consumerProps.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
consumerProps.put(CommonClientConfigs.CLIENT_ID_CONFIG, clientId);
final String groupInstanceId = (String) consumerProps.get(ConsumerConfig.GROUP_INSTANCE_ID_CONFIG);
// Suffix each thread consumer with thread.id to enforce uniqueness of group.instance.id.
if (groupInstanceId != null) {
consumerProps.put(ConsumerConfig.GROUP_INSTANCE_ID_CONFIG, groupInstanceId + "-" + threadIdx);
}
// add configs required for stream partition assignor
consumerProps.put(UPGRADE_FROM_CONFIG, getString(UPGRADE_FROM_CONFIG));
consumerProps.put(REPLICATION_FACTOR_CONFIG, getInt(REPLICATION_FACTOR_CONFIG));
consumerProps.put(APPLICATION_SERVER_CONFIG, getString(APPLICATION_SERVER_CONFIG));
consumerProps.put(NUM_STANDBY_REPLICAS_CONFIG, getInt(NUM_STANDBY_REPLICAS_CONFIG));
consumerProps.put(ACCEPTABLE_RECOVERY_LAG_CONFIG, getLong(ACCEPTABLE_RECOVERY_LAG_CONFIG));
consumerProps.put(MAX_WARMUP_REPLICAS_CONFIG, getInt(MAX_WARMUP_REPLICAS_CONFIG));
consumerProps.put(PROBING_REBALANCE_INTERVAL_MS_CONFIG, getLong(PROBING_REBALANCE_INTERVAL_MS_CONFIG));
consumerProps.put(ConsumerConfig.PARTITION_ASSIGNMENT_STRATEGY_CONFIG, StreamsPartitionAssignor.class.getName());
consumerProps.put(WINDOW_STORE_CHANGE_LOG_ADDITIONAL_RETENTION_MS_CONFIG, getLong(WINDOW_STORE_CHANGE_LOG_ADDITIONAL_RETENTION_MS_CONFIG));
consumerProps.put(RACK_AWARE_ASSIGNMENT_TAGS_CONFIG, getList(RACK_AWARE_ASSIGNMENT_TAGS_CONFIG));
// disable auto topic creation
consumerProps.put(ConsumerConfig.ALLOW_AUTO_CREATE_TOPICS_CONFIG, "false");
// verify that producer batch config is no larger than segment size, then add topic configs required for creating topics
final Map topicProps = originalsWithPrefix(TOPIC_PREFIX, false);
final Map producerProps = getClientPropsWithPrefix(PRODUCER_PREFIX, ProducerConfig.configNames());
if (topicProps.containsKey(topicPrefix(TopicConfig.SEGMENT_BYTES_CONFIG)) &&
producerProps.containsKey(ProducerConfig.BATCH_SIZE_CONFIG)) {
final int segmentSize = Integer.parseInt(topicProps.get(topicPrefix(TopicConfig.SEGMENT_BYTES_CONFIG)).toString());
final int batchSize = Integer.parseInt(producerProps.get(ProducerConfig.BATCH_SIZE_CONFIG).toString());
if (segmentSize < batchSize) {
throw new IllegalArgumentException(String.format("Specified topic segment size %d is is smaller than the configured producer batch size %d, this will cause produced batch not able to be appended to the topic",
segmentSize,
batchSize));
}
}
consumerProps.putAll(topicProps);
return consumerProps;
}
/**
* Get the configs for the {@link KafkaConsumer restore-consumer}.
* Properties using the prefix {@link #RESTORE_CONSUMER_PREFIX} will be used in favor over
* the properties prefixed with {@link #CONSUMER_PREFIX} and the non-prefixed versions
* (read the override precedence ordering in {@link #RESTORE_CONSUMER_PREFIX}
* except in the case of {@link ConsumerConfig#BOOTSTRAP_SERVERS_CONFIG} where we always use the non-prefixed
* version as we only support reading/writing from/to the same Kafka Cluster.
* If not specified by {@link #RESTORE_CONSUMER_PREFIX}, restore consumer will share the general consumer configs
* prefixed by {@link #CONSUMER_PREFIX}.
*
* @param clientId clientId
* @return Map of the restore consumer configuration.
*/
@SuppressWarnings("WeakerAccess")
public Map getRestoreConsumerConfigs(final String clientId) {
final Map baseConsumerProps = getCommonConsumerConfigs();
// Get restore consumer override configs
final Map restoreConsumerProps = originalsWithPrefix(RESTORE_CONSUMER_PREFIX);
for (final Map.Entry entry: restoreConsumerProps.entrySet()) {
baseConsumerProps.put(entry.getKey(), entry.getValue());
}
// no need to set group id for a restore consumer
baseConsumerProps.remove(ConsumerConfig.GROUP_ID_CONFIG);
// no need to set instance id for a restore consumer
baseConsumerProps.remove(ConsumerConfig.GROUP_INSTANCE_ID_CONFIG);
// add client id with stream client id prefix
baseConsumerProps.put(CommonClientConfigs.CLIENT_ID_CONFIG, clientId);
baseConsumerProps.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "none");
return baseConsumerProps;
}
/**
* Get the configs for the {@link KafkaConsumer global consumer}.
* Properties using the prefix {@link #GLOBAL_CONSUMER_PREFIX} will be used in favor over
* the properties prefixed with {@link #CONSUMER_PREFIX} and the non-prefixed versions
* (read the override precedence ordering in {@link #GLOBAL_CONSUMER_PREFIX}
* except in the case of {@link ConsumerConfig#BOOTSTRAP_SERVERS_CONFIG} where we always use the non-prefixed
* version as we only support reading/writing from/to the same Kafka Cluster.
* If not specified by {@link #GLOBAL_CONSUMER_PREFIX}, global consumer will share the general consumer configs
* prefixed by {@link #CONSUMER_PREFIX}.
*
* @param clientId clientId
* @return Map of the global consumer configuration.
*/
@SuppressWarnings("WeakerAccess")
public Map getGlobalConsumerConfigs(final String clientId) {
final Map baseConsumerProps = getCommonConsumerConfigs();
// Get global consumer override configs
final Map globalConsumerProps = originalsWithPrefix(GLOBAL_CONSUMER_PREFIX);
for (final Map.Entry entry: globalConsumerProps.entrySet()) {
baseConsumerProps.put(entry.getKey(), entry.getValue());
}
// no need to set group id for a global consumer
baseConsumerProps.remove(ConsumerConfig.GROUP_ID_CONFIG);
// no need to set instance id for a restore consumer
baseConsumerProps.remove(ConsumerConfig.GROUP_INSTANCE_ID_CONFIG);
// add client id with stream client id prefix
baseConsumerProps.put(CommonClientConfigs.CLIENT_ID_CONFIG, clientId + "-global-consumer");
baseConsumerProps.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "none");
return baseConsumerProps;
}
/**
* Get the configs for the {@link KafkaProducer producer}.
* Properties using the prefix {@link #PRODUCER_PREFIX} will be used in favor over their non-prefixed versions
* except in the case of {@link ProducerConfig#BOOTSTRAP_SERVERS_CONFIG} where we always use the non-prefixed
* version as we only support reading/writing from/to the same Kafka Cluster.
*
* @param clientId clientId
* @return Map of the producer configuration.
*/
@SuppressWarnings("WeakerAccess")
public Map getProducerConfigs(final String clientId) {
final Map clientProvidedProps = getClientPropsWithPrefix(PRODUCER_PREFIX, ProducerConfig.configNames());
checkIfUnexpectedUserSpecifiedConsumerConfig(clientProvidedProps, NON_CONFIGURABLE_PRODUCER_EOS_CONFIGS);
// generate producer configs from original properties and overridden maps
final Map props = new HashMap<>(eosEnabled ? PRODUCER_EOS_OVERRIDES : PRODUCER_DEFAULT_OVERRIDES);
props.putAll(getClientCustomProps());
props.putAll(clientProvidedProps);
// When using EOS alpha, stream should auto-downgrade the transactional commit protocol to be compatible with older brokers.
if (StreamsConfigUtils.processingMode(this) == StreamsConfigUtils.ProcessingMode.EXACTLY_ONCE_ALPHA) {
props.put("internal.auto.downgrade.txn.commit", true);
}
props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, originals().get(BOOTSTRAP_SERVERS_CONFIG));
// add client id with stream client id prefix
props.put(CommonClientConfigs.CLIENT_ID_CONFIG, clientId);
return props;
}
/**
* Get the configs for the {@link Admin admin client}.
* @param clientId clientId
* @return Map of the admin client configuration.
*/
@SuppressWarnings("WeakerAccess")
public Map getAdminConfigs(final String clientId) {
final Map clientProvidedProps = getClientPropsWithPrefix(ADMIN_CLIENT_PREFIX, AdminClientConfig.configNames());
final Map props = new HashMap<>();
props.putAll(getClientCustomProps());
props.putAll(clientProvidedProps);
// add client id with stream client id prefix
props.put(CommonClientConfigs.CLIENT_ID_CONFIG, clientId);
return props;
}
/**
* Get the configured client tags set with {@link #CLIENT_TAG_PREFIX} prefix.
*
* @return Map of the client tags.
*/
@SuppressWarnings("WeakerAccess")
public Map getClientTags() {
return originalsWithPrefix(CLIENT_TAG_PREFIX).entrySet().stream().collect(
Collectors.toMap(
Map.Entry::getKey,
tagEntry -> Objects.toString(tagEntry.getValue())
)
);
}
private Map getClientPropsWithPrefix(final String prefix,
final Set configNames) {
final Map props = clientProps(configNames, originals());
props.putAll(originalsWithPrefix(prefix));
return props;
}
/**
* Get a map of custom configs by removing from the originals all the Streams, Consumer, Producer, and AdminClient configs.
* Prefixed properties are also removed because they are already added by {@link #getClientPropsWithPrefix(String, Set)}.
* This allows to set a custom property for a specific client alone if specified using a prefix, or for all
* when no prefix is used.
*
* @return a map with the custom properties
*/
private Map getClientCustomProps() {
final Map props = originals();
props.keySet().removeAll(CONFIG.names());
props.keySet().removeAll(ConsumerConfig.configNames());
props.keySet().removeAll(ProducerConfig.configNames());
props.keySet().removeAll(AdminClientConfig.configNames());
props.keySet().removeAll(originalsWithPrefix(CONSUMER_PREFIX, false).keySet());
props.keySet().removeAll(originalsWithPrefix(PRODUCER_PREFIX, false).keySet());
props.keySet().removeAll(originalsWithPrefix(ADMIN_CLIENT_PREFIX, false).keySet());
return props;
}
/**
* Return an {@link Serde#configure(Map, boolean) configured} instance of {@link #DEFAULT_KEY_SERDE_CLASS_CONFIG key Serde
* class}.
*
* @return an configured instance of key Serde class
*/
@SuppressWarnings("WeakerAccess")
public Serde defaultKeySerde() {
final Object keySerdeConfigSetting = get(DEFAULT_KEY_SERDE_CLASS_CONFIG);
if (keySerdeConfigSetting == null) {
throw new ConfigException("Please specify a key serde or set one through StreamsConfig#DEFAULT_KEY_SERDE_CLASS_CONFIG");
}
try {
final Serde serde = getConfiguredInstance(DEFAULT_KEY_SERDE_CLASS_CONFIG, Serde.class);
serde.configure(originals(), true);
return serde;
} catch (final Exception e) {
throw new StreamsException(
String.format("Failed to configure key serde %s", keySerdeConfigSetting), e);
}
}
/**
* Return an {@link Serde#configure(Map, boolean) configured} instance of {@link #DEFAULT_VALUE_SERDE_CLASS_CONFIG value
* Serde class}.
*
* @return an configured instance of value Serde class
*/
@SuppressWarnings("WeakerAccess")
public Serde defaultValueSerde() {
final Object valueSerdeConfigSetting = get(DEFAULT_VALUE_SERDE_CLASS_CONFIG);
if (valueSerdeConfigSetting == null) {
throw new ConfigException("Please specify a value serde or set one through StreamsConfig#DEFAULT_VALUE_SERDE_CLASS_CONFIG");
}
try {
final Serde serde = getConfiguredInstance(DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serde.class);
serde.configure(originals(), false);
return serde;
} catch (final Exception e) {
throw new StreamsException(
String.format("Failed to configure value serde %s", valueSerdeConfigSetting), e);
}
}
@SuppressWarnings("WeakerAccess")
public TimestampExtractor defaultTimestampExtractor() {
return getConfiguredInstance(DEFAULT_TIMESTAMP_EXTRACTOR_CLASS_CONFIG, TimestampExtractor.class);
}
@SuppressWarnings("WeakerAccess")
public DeserializationExceptionHandler defaultDeserializationExceptionHandler() {
return getConfiguredInstance(DEFAULT_DESERIALIZATION_EXCEPTION_HANDLER_CLASS_CONFIG, DeserializationExceptionHandler.class);
}
@SuppressWarnings("WeakerAccess")
public ProductionExceptionHandler defaultProductionExceptionHandler() {
return getConfiguredInstance(DEFAULT_PRODUCTION_EXCEPTION_HANDLER_CLASS_CONFIG, ProductionExceptionHandler.class);
}
/**
* Override any client properties in the original configs with overrides
*
* @param configNames The given set of configuration names.
* @param originals The original configs to be filtered.
* @return client config with any overrides
*/
private Map clientProps(final Set configNames,
final Map originals) {
// iterate all client config names, filter out non-client configs from the original
// property map and use the overridden values when they are not specified by users
final Map parsed = new HashMap<>();
for (final String configName: configNames) {
if (originals.containsKey(configName)) {
parsed.put(configName, originals.get(configName));
}
}
return parsed;
}
public static void main(final String[] args) {
System.out.println(CONFIG.toHtml(4, config -> "streamsconfigs_" + config));
}
}