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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.clients.consumer;
import org.apache.kafka.clients.CommonClientConfigs;
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.serialization.Deserializer;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import static org.apache.kafka.common.config.ConfigDef.Range.atLeast;
import static org.apache.kafka.common.config.ConfigDef.ValidString.in;
/**
* The consumer configuration keys
*/
public class ConsumerConfig extends AbstractConfig {
private static final ConfigDef CONFIG;
/*
* NOTE: DO NOT CHANGE EITHER CONFIG STRINGS OR THEIR JAVA VARIABLE NAMES AS
* THESE ARE PART OF THE PUBLIC API AND CHANGE WILL BREAK USER CODE.
*/
/**
* group.id
*/
public static final String GROUP_ID_CONFIG = "group.id";
private static final String GROUP_ID_DOC = "A unique string that identifies the consumer group this consumer belongs to. This property is required if the consumer uses either the group management functionality by using subscribe(topic) or the Kafka-based offset management strategy.";
/**
* session.timeout.ms
*/
public static final String SESSION_TIMEOUT_MS_CONFIG = "session.timeout.ms";
private static final String SESSION_TIMEOUT_MS_DOC = "The timeout used to detect failures when using Kafka's group management facilities.";
/**
* heartbeat.interval.ms
*/
public static final String HEARTBEAT_INTERVAL_MS_CONFIG = "heartbeat.interval.ms";
private static final String HEARTBEAT_INTERVAL_MS_DOC = "The expected time between heartbeats to the consumer coordinator when using Kafka's group management facilities. Heartbeats are used to ensure that the consumer's session stays active and to facilitate rebalancing when new consumers join or leave the group. The value must be set lower than session.timeout.ms, but typically should be set no higher than 1/3 of that value. It can be adjusted even lower to control the expected time for normal rebalances.";
/**
* bootstrap.servers
*/
public static final String BOOTSTRAP_SERVERS_CONFIG = CommonClientConfigs.BOOTSTRAP_SERVERS_CONFIG;
/**
* enable.auto.commit
*/
public static final String ENABLE_AUTO_COMMIT_CONFIG = "enable.auto.commit";
private static final String ENABLE_AUTO_COMMIT_DOC = "If true the consumer's offset will be periodically committed in the background.";
/**
* auto.commit.interval.ms
*/
public static final String AUTO_COMMIT_INTERVAL_MS_CONFIG = "auto.commit.interval.ms";
private static final String AUTO_COMMIT_INTERVAL_MS_DOC = "The frequency in milliseconds that the consumer offsets are auto-committed to Kafka if enable.auto.commit is set to true.";
/**
* partition.assignment.strategy
*/
public static final String PARTITION_ASSIGNMENT_STRATEGY_CONFIG = "partition.assignment.strategy";
private static final String PARTITION_ASSIGNMENT_STRATEGY_DOC = "The class name of the partition assignment strategy that the client will use to distribute partition ownership amongst consumer instances when group management is used";
/**
* auto.offset.reset
*/
public static final String AUTO_OFFSET_RESET_CONFIG = "auto.offset.reset";
private static final String AUTO_OFFSET_RESET_DOC = "What to do when there is no initial offset in Kafka or if the current offset does not exist any more on the server (e.g. because that data has been deleted):
earliest: automatically reset the offset to the earliest offset
latest: automatically reset the offset to the latest offset
none: throw exception to the consumer if no previous offset is found for the consumer's group
anything else: throw exception to the consumer.
";
/**
* fetch.min.bytes
*/
public static final String FETCH_MIN_BYTES_CONFIG = "fetch.min.bytes";
private static final String FETCH_MIN_BYTES_DOC = "The minimum amount of data the server should return for a fetch request. If insufficient data is available the request will wait for that much data to accumulate before answering the request. The default setting of 1 byte means that fetch requests are answered as soon as a single byte of data is available or the fetch request times out waiting for data to arrive. Setting this to something greater than 1 will cause the server to wait for larger amounts of data to accumulate which can improve server throughput a bit at the cost of some additional latency.";
/**
* fetch.max.wait.ms
*/
public static final String FETCH_MAX_WAIT_MS_CONFIG = "fetch.max.wait.ms";
private static final String FETCH_MAX_WAIT_MS_DOC = "The maximum amount of time the server will block before answering the fetch request if there isn't sufficient data to immediately satisfy the requirement given by fetch.min.bytes.";
/** metadata.max.age.ms */
public static final String METADATA_MAX_AGE_CONFIG = CommonClientConfigs.METADATA_MAX_AGE_CONFIG;
/**
* max.partition.fetch.bytes
*/
public static final String MAX_PARTITION_FETCH_BYTES_CONFIG = "max.partition.fetch.bytes";
private static final String MAX_PARTITION_FETCH_BYTES_DOC = "The maximum amount of data per-partition the server will return. The maximum total memory used for a request will be #partitions * max.partition.fetch.bytes. This size must be at least as large as the maximum message size the server allows or else it is possible for the producer to send messages larger than the consumer can fetch. If that happens, the consumer can get stuck trying to fetch a large message on a certain partition.";
/** send.buffer.bytes */
public static final String SEND_BUFFER_CONFIG = CommonClientConfigs.SEND_BUFFER_CONFIG;
/** receive.buffer.bytes */
public static final String RECEIVE_BUFFER_CONFIG = CommonClientConfigs.RECEIVE_BUFFER_CONFIG;
/**
* client.id
*/
public static final String CLIENT_ID_CONFIG = CommonClientConfigs.CLIENT_ID_CONFIG;
/**
* reconnect.backoff.ms
*/
public static final String RECONNECT_BACKOFF_MS_CONFIG = CommonClientConfigs.RECONNECT_BACKOFF_MS_CONFIG;
/**
* retry.backoff.ms
*/
public static final String RETRY_BACKOFF_MS_CONFIG = CommonClientConfigs.RETRY_BACKOFF_MS_CONFIG;
/**
* metrics.sample.window.ms
*/
public static final String METRICS_SAMPLE_WINDOW_MS_CONFIG = CommonClientConfigs.METRICS_SAMPLE_WINDOW_MS_CONFIG;
/**
* metrics.num.samples
*/
public static final String METRICS_NUM_SAMPLES_CONFIG = CommonClientConfigs.METRICS_NUM_SAMPLES_CONFIG;
/**
* metric.reporters
*/
public static final String METRIC_REPORTER_CLASSES_CONFIG = CommonClientConfigs.METRIC_REPORTER_CLASSES_CONFIG;
/**
* check.crcs
*/
public static final String CHECK_CRCS_CONFIG = "check.crcs";
private static final String CHECK_CRCS_DOC = "Automatically check the CRC32 of the records consumed. This ensures no on-the-wire or on-disk corruption to the messages occurred. This check adds some overhead, so it may be disabled in cases seeking extreme performance.";
/** key.deserializer */
public static final String KEY_DESERIALIZER_CLASS_CONFIG = "key.deserializer";
public static final String KEY_DESERIALIZER_CLASS_DOC = "Deserializer class for key that implements the Deserializer interface.";
/** value.deserializer */
public static final String VALUE_DESERIALIZER_CLASS_CONFIG = "value.deserializer";
public static final String VALUE_DESERIALIZER_CLASS_DOC = "Deserializer class for value that implements the Deserializer interface.";
/** connections.max.idle.ms */
public static final String CONNECTIONS_MAX_IDLE_MS_CONFIG = CommonClientConfigs.CONNECTIONS_MAX_IDLE_MS_CONFIG;
/** request.timeout.ms */
public static final String REQUEST_TIMEOUT_MS_CONFIG = CommonClientConfigs.REQUEST_TIMEOUT_MS_CONFIG;
private static final String REQUEST_TIMEOUT_MS_DOC = CommonClientConfigs.REQUEST_TIMEOUT_MS_DOC;
static {
CONFIG = new ConfigDef().define(BOOTSTRAP_SERVERS_CONFIG,
Type.LIST,
Importance.HIGH,
CommonClientConfigs.BOOSTRAP_SERVERS_DOC)
.define(GROUP_ID_CONFIG, Type.STRING, "", Importance.HIGH, GROUP_ID_DOC)
.define(SESSION_TIMEOUT_MS_CONFIG,
Type.INT,
30000,
Importance.HIGH,
SESSION_TIMEOUT_MS_DOC)
.define(HEARTBEAT_INTERVAL_MS_CONFIG,
Type.INT,
3000,
Importance.HIGH,
HEARTBEAT_INTERVAL_MS_DOC)
.define(PARTITION_ASSIGNMENT_STRATEGY_CONFIG,
Type.LIST,
RangeAssignor.class.getName(),
Importance.MEDIUM,
PARTITION_ASSIGNMENT_STRATEGY_DOC)
.define(METADATA_MAX_AGE_CONFIG,
Type.LONG,
5 * 60 * 1000,
atLeast(0),
Importance.LOW,
CommonClientConfigs.METADATA_MAX_AGE_DOC)
.define(ENABLE_AUTO_COMMIT_CONFIG,
Type.BOOLEAN,
true,
Importance.MEDIUM,
ENABLE_AUTO_COMMIT_DOC)
.define(AUTO_COMMIT_INTERVAL_MS_CONFIG,
Type.LONG,
5000,
atLeast(0),
Importance.LOW,
AUTO_COMMIT_INTERVAL_MS_DOC)
.define(CLIENT_ID_CONFIG,
Type.STRING,
"",
Importance.LOW,
CommonClientConfigs.CLIENT_ID_DOC)
.define(MAX_PARTITION_FETCH_BYTES_CONFIG,
Type.INT,
1 * 1024 * 1024,
atLeast(0),
Importance.HIGH,
MAX_PARTITION_FETCH_BYTES_DOC)
.define(SEND_BUFFER_CONFIG,
Type.INT,
128 * 1024,
atLeast(0),
Importance.MEDIUM,
CommonClientConfigs.SEND_BUFFER_DOC)
.define(RECEIVE_BUFFER_CONFIG,
Type.INT,
32 * 1024,
atLeast(0),
Importance.MEDIUM,
CommonClientConfigs.RECEIVE_BUFFER_DOC)
.define(FETCH_MIN_BYTES_CONFIG,
Type.INT,
1,
atLeast(0),
Importance.HIGH,
FETCH_MIN_BYTES_DOC)
.define(FETCH_MAX_WAIT_MS_CONFIG,
Type.INT,
500,
atLeast(0),
Importance.LOW,
FETCH_MAX_WAIT_MS_DOC)
.define(RECONNECT_BACKOFF_MS_CONFIG,
Type.LONG,
50L,
atLeast(0L),
Importance.LOW,
CommonClientConfigs.RECONNECT_BACKOFF_MS_DOC)
.define(RETRY_BACKOFF_MS_CONFIG,
Type.LONG,
100L,
atLeast(0L),
Importance.LOW,
CommonClientConfigs.RETRY_BACKOFF_MS_DOC)
.define(AUTO_OFFSET_RESET_CONFIG,
Type.STRING,
"latest",
in("latest", "earliest", "none"),
Importance.MEDIUM,
AUTO_OFFSET_RESET_DOC)
.define(CHECK_CRCS_CONFIG,
Type.BOOLEAN,
true,
Importance.LOW,
CHECK_CRCS_DOC)
.define(METRICS_SAMPLE_WINDOW_MS_CONFIG,
Type.LONG,
30000,
atLeast(0),
Importance.LOW,
CommonClientConfigs.METRICS_SAMPLE_WINDOW_MS_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(KEY_DESERIALIZER_CLASS_CONFIG,
Type.CLASS,
Importance.HIGH,
KEY_DESERIALIZER_CLASS_DOC)
.define(VALUE_DESERIALIZER_CLASS_CONFIG,
Type.CLASS,
Importance.HIGH,
VALUE_DESERIALIZER_CLASS_DOC)
.define(REQUEST_TIMEOUT_MS_CONFIG,
Type.INT,
40 * 1000,
atLeast(0),
Importance.MEDIUM,
REQUEST_TIMEOUT_MS_DOC)
/* default is set to be a bit lower than the server default (10 min), to avoid both client and server closing connection at same time */
.define(CONNECTIONS_MAX_IDLE_MS_CONFIG,
Type.LONG,
9 * 60 * 1000,
Importance.MEDIUM,
CommonClientConfigs.CONNECTIONS_MAX_IDLE_MS_DOC)
// security support
.define(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG,
Type.STRING,
CommonClientConfigs.DEFAULT_SECURITY_PROTOCOL,
Importance.MEDIUM,
CommonClientConfigs.SECURITY_PROTOCOL_DOC)
.withClientSslSupport()
.withClientSaslSupport();
}
public static Map addDeserializerToConfig(Map configs,
Deserializer keyDeserializer,
Deserializer valueDeserializer) {
Map newConfigs = new HashMap();
newConfigs.putAll(configs);
if (keyDeserializer != null)
newConfigs.put(KEY_DESERIALIZER_CLASS_CONFIG, keyDeserializer.getClass());
if (valueDeserializer != null)
newConfigs.put(VALUE_DESERIALIZER_CLASS_CONFIG, valueDeserializer.getClass());
return newConfigs;
}
public static Properties addDeserializerToConfig(Properties properties,
Deserializer keyDeserializer,
Deserializer valueDeserializer) {
Properties newProperties = new Properties();
newProperties.putAll(properties);
if (keyDeserializer != null)
newProperties.put(KEY_DESERIALIZER_CLASS_CONFIG, keyDeserializer.getClass().getName());
if (valueDeserializer != null)
newProperties.put(VALUE_DESERIALIZER_CLASS_CONFIG, valueDeserializer.getClass().getName());
return newProperties;
}
ConsumerConfig(Map props) {
super(CONFIG, props);
}
public static void main(String[] args) {
System.out.println(CONFIG.toHtmlTable());
}
}
