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Java kafka producer 的常用参数的意义说明及默认值_acks=0

作者：凡人多烦事01 | 2024-05-27 07:28:43

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acks=0

生产端核心参数

1. acks

参数说明：这是一个非常重要的参数，表示指定分区中成功写入消息的副本数量，这是Kafka生产端消息的持久性（durability）保证。只有当leader确认已成功写入消息的副本数后，才会给Producer发送响应，此时消息才可以认为“已提交”。该参数影响着消息的可靠性以及生产端的吞吐量，并且两者往往相向而驰，通常消息可靠性越高则生产端的吞吐量越低，反之亦然。acks有3个取值：

  • acks = 0：表示生产端发送消息后立即返回，不等待broker端的响应结果。通常此时生产端吞吐量最高，消息发送的可靠性最低。

  • acks = 1: 表示leader副本成功写入就会响应Producer，而无需等待ISR（同步副本）集合中的其他副本写入成功。这种方案提供了适当的持久性，保证了一定的吞吐量。默认值即是1。

  • acks = all或-1: 表示不仅要等leader副本成功写入，还要求ISR中的其他副本成功写入，才会响应Producer。这种方案提供了最高的持久性，但也提供了最差的吞吐量。

调优建议：建议根据实际情况设置，如果要严格保证消息不丢失，请设置为all或-1；如果允许存在丢失，建议设置为1；一般不建议设为0，除非无所谓消息丢不丢失。

2. max.request.size

参数说明：这个参数比较重要，表示生产端能够发送的最大消息大小，默认值为1048576，即1M。

调优建议：一般而言，这个配置有点小，为了避免因消息过大导致发送失败，建议适当调大，比如调到10485760即10M。

3. retries

参数说明：表示生产端消息发送失败时的重试次数，默认值为0，表示不进行重试。这个参数一般是为了解决因瞬时故障导致的消息发送失败，比如网络抖动、leader换主，其中瞬时的leader重选举是比较常见的。因此这个参数的设置显得非常重要。

另外为了避免频繁重试的影响，两次重试之间都会停顿一段时间，受参数retry.backoff.ms，默认为100ms，通常可以不调整。

调优建议：这里要尽量避免消息丢失，建议设置为一个大于0的值，比如3或者更大值。

4. compression.type

参数说明：表示生产端是否对消息进行压缩，默认值为none，即不压缩消息。压缩可以显著减少网络IO传输、磁盘IO以及磁盘空间，从而提升整体吞吐量，但也是以牺牲CPU开销为代价的。当前Kafka支持4种压缩方式，分别是gzip、snappy、lz4 及 zstd（Kafka 2.1.0开始支持）。

调优建议：出于提升吞吐量的考虑，建议在生产端对消息进行压缩。对于Kafka而已，综合考虑吞吐量与压缩比，建议选择lz4压缩。如果追求最高的压缩比则推荐zstd压缩。

5. buffer.memory

参数说明：表示生产端消息缓冲池或缓冲区的大小，默认值为33554432，即32M。这个参数基本可以认为是Producer程序所使用的内存大小。

当前版本中，如果生产消息的速度过快导致buffer满了的时候，将阻塞max.block.ms（默认60000即60s）配置的时间，超时将会抛TimeoutException异常。在Kafka 0.9.0及之前版本，建议设置另一个参数block.on.buffer.full为true，该参数表示当buffer填满时Producer处于阻塞状态并停止接收新消息而不是抛异常。

调优建议：通常我们应尽量保证生产端整体吞吐量，建议适当调大该参数，也意味着生产客户端会占用更多的内存。也可以选择不调整。

6. batch.size

参数说明：发送到缓冲区中的消息会被分为一个一个的batch，分批次的发送到broker 端，这个参数就表示batch批次大小，默认值为16384，即16KB。因此减小batch大小有利于降低消息延时，增加batch大小有利于提升吞吐量。

调优建议：通常合理调大该参数值，能够显著提升生产端吞吐量，比如可以调整到32KB，调大也意味着消息会有相对较大的延时。

7. linger.ms

参数说明：用来控制batch最大的空闲时间，超过该时间的batch也会被发送到broker端。这实际上是一种权衡，即吞吐量与延时之间的权衡。默认值为0，表示消息需要被立即发送，无需关系batch是否被填满。

调优建议：通常为了减少请求次数、提升整体吞吐量，建议设置一个大于0的值，比如设置为100，此时会在负载低的情况下带来100ms的延时。

8. request.timeout.ms

参数说明：这个参数表示生产端发送请求后等待broker端响应的最长时间，默认值为30000，即30s，超时生产端可能会选择重试（如果配置了retries）。

调优建议：该参数默认值一般够用了。如果生产端负载很大，可以适当调大以避免超时，比如可以调到60000。

9. max.in.fight.requests.per.connection

参数说明：这个参数非常重要，表示生产端与broker之间的每个连接最多缓存的请求数，默认值为5，即每个连接最多可以缓存5个未响应的请求。这个参数通常用来解决分区乱序的问题。

调优建议：为了避免消息乱序问题，建议将该参数设置为1，表示生产端在某个broker响应之前将无法再向该broker发送消息请求，这能够有效避免同一分区下的消息乱序问题。

无消息丢失配置

Producer既要保证吞吐量，又要确保无消息丢失。结合上面的参数介绍，这里给出消息无丢失的配置列表，如下：

  • acks = all or -1

  • retries = 3

  • max.in.fight.requests.per.connection = 1

  • 使用带回调机制的send方法即send(record, callback)发送消息，并对失败消息进行处理

  • unclean.leader.election.enable = false

  • replication.factor = 3

  • min.insync.replicas = 2

  • enable.auto.commit = false

前3个参数本文已介绍。最后一个是消费端参数，表示禁用自动提交，后面我们再介绍。其他几个属于broker端的参数。

其中比较难理解的是min.insync.replicas，这个参数表示ISR集合中的最少副本数，默认值是1，并只有在acks=all或-1时才有效。acks与min.insync.replicas搭配使用，才能为消息提供最高的持久性保证。我们知道leader副本默认就包含在ISR中，如果ISR中只有1个副本，acks=all也就相当于acks=1了，引入min.insync.replicas的目的就是为了保证下限：不能只满足于ISR全部写入，还要保证ISR中的写入个数不少于min.insync.replicas。常见的场景是创建一个三副本（即replication.factor=3）的topic，最少同步副本数设为2（即min.insync.replicas=2），acks设为all，以保证最高的消息持久性。

producer初始化配置代码

  1. public class ProducerConfig extends AbstractConfig {
  2.  
  3.     /*
  4.      * NOTE: DO NOT CHANGE EITHER CONFIG STRINGS OR THEIR JAVA VARIABLE NAMES AS THESE ARE PART OF THE PUBLIC API AND
  5.      * CHANGE WILL BREAK USER CODE.
  6.      */
  8.     private static final ConfigDef CONFIG;
  9.  
  10.     /** <code>bootstrap.servers</code> */
  11.     public static final String BOOTSTRAP_SERVERS_CONFIG = CommonClientConfigs.BOOTSTRAP_SERVERS_CONFIG;
  12.  
  13.     /** <code>metadata.max.age.ms</code> */
  14.     public static final String METADATA_MAX_AGE_CONFIG = CommonClientConfigs.METADATA_MAX_AGE_CONFIG;
  15.     private static final String METADATA_MAX_AGE_DOC = CommonClientConfigs.METADATA_MAX_AGE_DOC;
  16.  
  17.     /** <code>batch.size</code> */
  18.     public static final String BATCH_SIZE_CONFIG = "batch.size";
  19.     private static final String BATCH_SIZE_DOC = "The producer will attempt to batch records together into fewer requests whenever multiple records are being sent"
  20.                                                  + " to the same partition. This helps performance on both the client and the server. This configuration controls the "
  21.                                                  + "default batch size in bytes. "
  22.                                                  + "<p>"
  23.                                                  + "No attempt will be made to batch records larger than this size. "
  24.                                                  + "<p>"
  25.                                                  + "Requests sent to brokers will contain multiple batches, one for each partition with data available to be sent. "
  26.                                                  + "<p>"
  27.                                                  + "A small batch size will make batching less common and may reduce throughput (a batch size of zero will disable "
  28.                                                  + "batching entirely). A very large batch size may use memory a bit more wastefully as we will always allocate a "
  29.                                                  + "buffer of the specified batch size in anticipation of additional records.";
  30.  
  31.     /** <code>acks</code> */
  32.     public static final String ACKS_CONFIG = "acks";
  33.     private static final String ACKS_DOC = "The number of acknowledgments the producer requires the leader to have received before considering a request complete. This controls the "
  34.                                            + " durability of records that are sent. The following settings are allowed: "
  35.                                            + " <ul>"
  36.                                            + " <li><code>acks=0</code> If set to zero then the producer will not wait for any acknowledgment from the"
  37.                                            + " server at all. The record will be immediately added to the socket buffer and considered sent. No guarantee can be"
  38.                                            + " made that the server has received the record in this case, and the <code>retries</code> configuration will not"
  39.                                            + " take effect (as the client won't generally know of any failures). The offset given back for each record will"
  40.                                            + " always be set to -1."
  41.                                            + " <li><code>acks=1</code> This will mean the leader will write the record to its local log but will respond"
  42.                                            + " without awaiting full acknowledgement from all followers. In this case should the leader fail immediately after"
  43.                                            + " acknowledging the record but before the followers have replicated it then the record will be lost."
  44.                                            + " <li><code>acks=all</code> This means the leader will wait for the full set of in-sync replicas to"
  45.                                            + " acknowledge the record. This guarantees that the record will not be lost as long as at least one in-sync replica"
  46.                                            + " remains alive. This is the strongest available guarantee. This is equivalent to the acks=-1 setting.";
  47.  
  48.     /** <code>linger.ms</code> */
  49.     public static final String LINGER_MS_CONFIG = "linger.ms";
  50.     private static final String LINGER_MS_DOC = "The producer groups together any records that arrive in between request transmissions into a single batched request. "
  51.                                                 + "Normally this occurs only under load when records arrive faster than they can be sent out. However in some circumstances the client may want to "
  52.                                                 + "reduce the number of requests even under moderate load. This setting accomplishes this by adding a small amount "
  53.                                                 + "of artificial delay&mdash;that is, rather than immediately sending out a record the producer will wait for up to "
  54.                                                 + "the given delay to allow other records to be sent so that the sends can be batched together. This can be thought "
  55.                                                 + "of as analogous to Nagle's algorithm in TCP. This setting gives the upper bound on the delay for batching: once "
  56.                                                 + "we get <code>" + BATCH_SIZE_CONFIG + "</code> worth of records for a partition it will be sent immediately regardless of this "
  57.                                                 + "setting, however if we have fewer than this many bytes accumulated for this partition we will 'linger' for the "
  58.                                                 + "specified time waiting for more records to show up. This setting defaults to 0 (i.e. no delay). Setting <code>" + LINGER_MS_CONFIG + "=5</code>, "
  59.                                                 + "for example, would have the effect of reducing the number of requests sent but would add up to 5ms of latency to records sent in the absense of load.";
  60.  
  61.     /** <code>client.id</code> */
  62.     public static final String CLIENT_ID_CONFIG = CommonClientConfigs.CLIENT_ID_CONFIG;
  63.  
  64.     /** <code>send.buffer.bytes</code> */
  65.     public static final String SEND_BUFFER_CONFIG = CommonClientConfigs.SEND_BUFFER_CONFIG;
  66.  
  67.     /** <code>receive.buffer.bytes</code> */
  68.     public static final String RECEIVE_BUFFER_CONFIG = CommonClientConfigs.RECEIVE_BUFFER_CONFIG;
  69.  
  70.     /** <code>max.request.size</code> */
  71.     public static final String MAX_REQUEST_SIZE_CONFIG = "max.request.size";
  72.     private static final String MAX_REQUEST_SIZE_DOC = "The maximum size of a request in bytes. This setting will limit the number of record "
  73.                                                        + "batches the producer will send in a single request to avoid sending huge requests. "
  74.                                                        + "This is also effectively a cap on the maximum record batch size. Note that the server "
  75.                                                        + "has its own cap on record batch size which may be different from this.";
  76.  
  77.     /** <code>reconnect.backoff.ms</code> */
  78.     public static final String RECONNECT_BACKOFF_MS_CONFIG = CommonClientConfigs.RECONNECT_BACKOFF_MS_CONFIG;
  79.  
  80.     /** <code>reconnect.backoff.max.ms</code> */
  81.     public static final String RECONNECT_BACKOFF_MAX_MS_CONFIG = CommonClientConfigs.RECONNECT_BACKOFF_MAX_MS_CONFIG;
  82.  
  83.     /** <code>max.block.ms</code> */
  84.     public static final String MAX_BLOCK_MS_CONFIG = "max.block.ms";
  85.     private static final String MAX_BLOCK_MS_DOC = "The configuration controls how long <code>KafkaProducer.send()</code> and <code>KafkaProducer.partitionsFor()</code> will block."
  86.                                                     + "These methods can be blocked either because the buffer is full or metadata unavailable."
  87.                                                     + "Blocking in the user-supplied serializers or partitioner will not be counted against this timeout.";
  88.  
  89.     /** <code>buffer.memory</code> */
  90.     public static final String BUFFER_MEMORY_CONFIG = "buffer.memory";
  91.     private static final String BUFFER_MEMORY_DOC = "The total bytes of memory the producer can use to buffer records waiting to be sent to the server. If records are "
  92.                                                     + "sent faster than they can be delivered to the server the producer will block for <code>" + MAX_BLOCK_MS_CONFIG + "</code> after which it will throw an exception."
  93.                                                     + "<p>"
  94.                                                     + "This setting should correspond roughly to the total memory the producer will use, but is not a hard bound since "
  95.                                                     + "not all memory the producer uses is used for buffering. Some additional memory will be used for compression (if "
  96.                                                     + "compression is enabled) as well as for maintaining in-flight requests.";
  97.  
  98.     /** <code>retry.backoff.ms</code> */
  99.     public static final String RETRY_BACKOFF_MS_CONFIG = CommonClientConfigs.RETRY_BACKOFF_MS_CONFIG;
  100.  
  101.     /** <code>compression.type</code> */
  102.     public static final String COMPRESSION_TYPE_CONFIG = "compression.type";
  103.     private static final String COMPRESSION_TYPE_DOC = "The compression type for all data generated by the producer. The default is none (i.e. no compression). Valid "
  104.                                                        + " values are <code>none</code>, <code>gzip</code>, <code>snappy</code>, or <code>lz4</code>. "
  105.                                                        + "Compression is of full batches of data, so the efficacy of batching will also impact the compression ratio (more batching means better compression).";
  106.  
  107.     /** <code>metrics.sample.window.ms</code> */
  108.     public static final String METRICS_SAMPLE_WINDOW_MS_CONFIG = CommonClientConfigs.METRICS_SAMPLE_WINDOW_MS_CONFIG;
  109.  
  110.     /** <code>metrics.num.samples</code> */
  111.     public static final String METRICS_NUM_SAMPLES_CONFIG = CommonClientConfigs.METRICS_NUM_SAMPLES_CONFIG;
  112.  
  113.     /**
  114.      * <code>metrics.log.level</code>
  115.      */
  116.     public static final String METRICS_RECORDING_LEVEL_CONFIG = CommonClientConfigs.METRICS_RECORDING_LEVEL_CONFIG;
  117.  
  118.     /** <code>metric.reporters</code> */
  119.     public static final String METRIC_REPORTER_CLASSES_CONFIG = CommonClientConfigs.METRIC_REPORTER_CLASSES_CONFIG;
  120.  
  121.     /** <code>max.in.flight.requests.per.connection</code> */
  122.     public static final String MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION = "max.in.flight.requests.per.connection";
  123.     private static final String MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION_DOC = "The maximum number of unacknowledged requests the client will send on a single connection before blocking."
  124.                                                                             + " Note that if this setting is set to be greater than 1 and there are failed sends, there is a risk of"
  125.                                                                             + " message re-ordering due to retries (i.e., if retries are enabled).";
  126.  
  127.     /** <code>retries</code> */
  128.     public static final String RETRIES_CONFIG = "retries";
  129.     private static final String RETRIES_DOC = "Setting a value greater than zero will cause the client to resend any record whose send fails with a potentially transient error."
  130.                                               + " Note that this retry is no different than if the client resent the record upon receiving the error."
  131.                                               + " Allowing retries without setting <code>" + MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION + "</code> to 1 will potentially change the"
  132.                                               + " ordering of records because if two batches are sent to a single partition, and the first fails and is retried but the second"
  133.                                               + " succeeds, then the records in the second batch may appear first.";
  134.  
  135.     /** <code>key.serializer</code> */
  136.     public static final String KEY_SERIALIZER_CLASS_CONFIG = "key.serializer";
  137.     public static final String KEY_SERIALIZER_CLASS_DOC = "Serializer class for key that implements the <code>org.apache.kafka.common.serialization.Serializer</code> interface.";
  138.  
  139.     /** <code>value.serializer</code> */
  140.     public static final String VALUE_SERIALIZER_CLASS_CONFIG = "value.serializer";
  141.     public static final String VALUE_SERIALIZER_CLASS_DOC = "Serializer class for value that implements the <code>org.apache.kafka.common.serialization.Serializer</code> interface.";
  142.  
  143.     /** <code>connections.max.idle.ms</code> */
  144.     public static final String CONNECTIONS_MAX_IDLE_MS_CONFIG = CommonClientConfigs.CONNECTIONS_MAX_IDLE_MS_CONFIG;
  145.  
  146.     /** <code>partitioner.class</code> */
  147.     public static final String PARTITIONER_CLASS_CONFIG = "partitioner.class";
  148.     private static final String PARTITIONER_CLASS_DOC = "Partitioner class that implements the <code>org.apache.kafka.clients.producer.Partitioner</code> interface.";
  149.  
  150.     /** <code>request.timeout.ms</code> */
  151.     public static final String REQUEST_TIMEOUT_MS_CONFIG = CommonClientConfigs.REQUEST_TIMEOUT_MS_CONFIG;
  152.     private static final String REQUEST_TIMEOUT_MS_DOC = CommonClientConfigs.REQUEST_TIMEOUT_MS_DOC
  153.                                                         + " This should be larger than replica.lag.time.max.ms (a broker configuration)"
  154.                                                         + " to reduce the possibility of message duplication due to unnecessary producer retries.";
  155.  
  156.     /** <code>interceptor.classes</code> */
  157.     public static final String INTERCEPTOR_CLASSES_CONFIG = "interceptor.classes";
  158.     public static final String INTERCEPTOR_CLASSES_DOC = "A list of classes to use as interceptors. "
  159.                                                         + "Implementing the <code>org.apache.kafka.clients.producer.ProducerInterceptor</code> interface allows you to intercept (and possibly mutate) the records "
  160.                                                         + "received by the producer before they are published to the Kafka cluster. By default, there are no interceptors.";
  161.  
  162.     /** <code>enable.idempotence</code> */
  163.     public static final String ENABLE_IDEMPOTENCE_CONFIG = "enable.idempotence";
  164.     public static final String ENABLE_IDEMPOTENCE_DOC = "When set to 'true', the producer will ensure that exactly one copy of each message is written in the stream. If 'false', producer "
  165.                                                         + "retries due to broker failures, etc., may write duplicates of the retried message in the stream. "
  166.                                                         + "Note that enabling idempotence requires <code>" + MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION + "</code> to be less than or equal to 5, "
  167.                                                         + "<code>" + RETRIES_CONFIG + "</code> to be greater than 0 and " + ACKS_CONFIG + " must be 'all'. If these values "
  168.                                                         + "are not explicitly set by the user, suitable values will be chosen. If incompatible values are set, "
  169.                                                         + "a ConfigException will be thrown.";
  170.  
  171.     /** <code> transaction.timeout.ms </code> */
  172.     public static final String TRANSACTION_TIMEOUT_CONFIG = "transaction.timeout.ms";
  173.     public static final String TRANSACTION_TIMEOUT_DOC = "The maximum amount of time in ms that the transaction coordinator will wait for a transaction status update from the producer before proactively aborting the ongoing transaction." +
  174.             "If this value is larger than the max.transaction.timeout.ms setting in the broker, the request will fail with a `InvalidTransactionTimeout` error.";
  175.  
  176.     /** <code> transactional.id </code> */
  177.     public static final String TRANSACTIONAL_ID_CONFIG = "transactional.id";
  178.     public static final String TRANSACTIONAL_ID_DOC = "The TransactionalId to use for transactional delivery. This enables reliability semantics which span multiple producer sessions since it allows the client to guarantee that transactions using the same TransactionalId have been completed prior to starting any new transactions. If no TransactionalId is provided, then the producer is limited to idempotent delivery. " +
  179.             "Note that enable.idempotence must be enabled if a TransactionalId is configured. " +
  180.             "The default is empty, which means transactions cannot be used.";
  181.  
  182.     static {
  183.         CONFIG = new ConfigDef().define(BOOTSTRAP_SERVERS_CONFIG, Type.LIST, Importance.HIGH, CommonClientConfigs.BOOTSTRAP_SERVERS_DOC)
  184.                                 .define(BUFFER_MEMORY_CONFIG, Type.LONG, 32 * 1024 * 1024L, atLeast(0L), Importance.HIGH, BUFFER_MEMORY_DOC)
  185.                                 .define(RETRIES_CONFIG, Type.INT, 0, between(0, Integer.MAX_VALUE), Importance.HIGH, RETRIES_DOC)
  186.                                 .define(ACKS_CONFIG,
  187.                                         Type.STRING,
  188.                                         "1",
  189.                                         in("all", "-1", "0", "1"),
  190.                                         Importance.HIGH,
  191.                                         ACKS_DOC)
  192.                                 .define(COMPRESSION_TYPE_CONFIG, Type.STRING, "none", Importance.HIGH, COMPRESSION_TYPE_DOC)
  193.                                 .define(BATCH_SIZE_CONFIG, Type.INT, 16384, atLeast(0), Importance.MEDIUM, BATCH_SIZE_DOC)
  194.                                 .define(LINGER_MS_CONFIG, Type.LONG, 0, atLeast(0L), Importance.MEDIUM, LINGER_MS_DOC)
  195.                                 .define(CLIENT_ID_CONFIG, Type.STRING, "", Importance.MEDIUM, CommonClientConfigs.CLIENT_ID_DOC)
  196.                                 .define(SEND_BUFFER_CONFIG, Type.INT, 128 * 1024, atLeast(-1), Importance.MEDIUM, CommonClientConfigs.SEND_BUFFER_DOC)
  197.                                 .define(RECEIVE_BUFFER_CONFIG, Type.INT, 32 * 1024, atLeast(-1), Importance.MEDIUM, CommonClientConfigs.RECEIVE_BUFFER_DOC)
  198.                                 .define(MAX_REQUEST_SIZE_CONFIG,
  199.                                         Type.INT,
  200.                                         1 * 1024 * 1024,
  201.                                         atLeast(0),
  202.                                         Importance.MEDIUM,
  203.                                         MAX_REQUEST_SIZE_DOC)
  204.                                 .define(RECONNECT_BACKOFF_MS_CONFIG, Type.LONG, 50L, atLeast(0L), Importance.LOW, CommonClientConfigs.RECONNECT_BACKOFF_MS_DOC)
  205.                                 .define(RECONNECT_BACKOFF_MAX_MS_CONFIG, Type.LONG, 1000L, atLeast(0L), Importance.LOW, CommonClientConfigs.RECONNECT_BACKOFF_MAX_MS_DOC)
  206.                                 .define(RETRY_BACKOFF_MS_CONFIG, Type.LONG, 100L, atLeast(0L), Importance.LOW, CommonClientConfigs.RETRY_BACKOFF_MS_DOC)
  207.                                 .define(MAX_BLOCK_MS_CONFIG,
  208.                                         Type.LONG,
  209.                                         60 * 1000,
  210.                                         atLeast(0),
  211.                                         Importance.MEDIUM,
  212.                                         MAX_BLOCK_MS_DOC)
  213.                                 .define(REQUEST_TIMEOUT_MS_CONFIG,
  214.                                         Type.INT,
  215.                                         30 * 1000,
  216.                                         atLeast(0),
  217.                                         Importance.MEDIUM,
  218.                                         REQUEST_TIMEOUT_MS_DOC)
  219.                                 .define(METADATA_MAX_AGE_CONFIG, Type.LONG, 5 * 60 * 1000, atLeast(0), Importance.LOW, METADATA_MAX_AGE_DOC)
  220.                                 .define(METRICS_SAMPLE_WINDOW_MS_CONFIG,
  221.                                         Type.LONG,
  222.                                         30000,
  223.                                         atLeast(0),
  224.                                         Importance.LOW,
  225.                                         CommonClientConfigs.METRICS_SAMPLE_WINDOW_MS_DOC)
  226.                                 .define(METRICS_NUM_SAMPLES_CONFIG, Type.INT, 2, atLeast(1), Importance.LOW, CommonClientConfigs.METRICS_NUM_SAMPLES_DOC)
  227.                                 .define(METRICS_RECORDING_LEVEL_CONFIG,
  228.                                         Type.STRING,
  229.                                         Sensor.RecordingLevel.INFO.toString(),
  230.                                         in(Sensor.RecordingLevel.INFO.toString(), Sensor.RecordingLevel.DEBUG.toString()),
  231.                                         Importance.LOW,
  232.                                         CommonClientConfigs.METRICS_RECORDING_LEVEL_DOC)
  233.                                 .define(METRIC_REPORTER_CLASSES_CONFIG,
  234.                                         Type.LIST,
  235.                                         "",
  236.                                         Importance.LOW,
  237.                                         CommonClientConfigs.METRIC_REPORTER_CLASSES_DOC)
  238.                                 .define(MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION,
  239.                                         Type.INT,
  240.                                         5,
  241.                                         atLeast(1),
  242.                                         Importance.LOW,
  243.                                         MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION_DOC)
  244.                                 .define(KEY_SERIALIZER_CLASS_CONFIG,
  245.                                         Type.CLASS,
  246.                                         Importance.HIGH,
  247.                                         KEY_SERIALIZER_CLASS_DOC)
  248.                                 .define(VALUE_SERIALIZER_CLASS_CONFIG,
  249.                                         Type.CLASS,
  250.                                         Importance.HIGH,
  251.                                         VALUE_SERIALIZER_CLASS_DOC)
  252.                                 /* 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 */
  253.                                 .define(CONNECTIONS_MAX_IDLE_MS_CONFIG,
  254.                                         Type.LONG,
  255.                                         9 * 60 * 1000,
  256.                                         Importance.MEDIUM,
  257.                                         CommonClientConfigs.CONNECTIONS_MAX_IDLE_MS_DOC)
  258.                                 .define(PARTITIONER_CLASS_CONFIG,
  259.                                         Type.CLASS,
  260.                                         DefaultPartitioner.class,
  261.                                         Importance.MEDIUM, PARTITIONER_CLASS_DOC)
  262.                                 .define(INTERCEPTOR_CLASSES_CONFIG,
  263.                                         Type.LIST,
  264.                                         null,
  265.                                         Importance.LOW,
  266.                                         INTERCEPTOR_CLASSES_DOC)
  267.                                 .define(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG,
  268.                                         Type.STRING,
  269.                                         CommonClientConfigs.DEFAULT_SECURITY_PROTOCOL,
  270.                                         Importance.MEDIUM,
  271.                                         CommonClientConfigs.SECURITY_PROTOCOL_DOC)
  272.                                 .withClientSslSupport()
  273.                                 .withClientSaslSupport()
  274.                                 .define(ENABLE_IDEMPOTENCE_CONFIG,
  275.                                         Type.BOOLEAN,
  276.                                         false,
  277.                                         Importance.LOW,
  278.                                         ENABLE_IDEMPOTENCE_DOC)
  279.                                 .define(TRANSACTION_TIMEOUT_CONFIG,
  280.                                         Type.INT,
  281.                                         60000,
  282.                                         Importance.LOW,
  283.                                         TRANSACTION_TIMEOUT_DOC)
  284.                                 .define(TRANSACTIONAL_ID_CONFIG,
  285.                                         Type.STRING,
  286.                                         null,
  287.                                         new ConfigDef.NonEmptyString(),
  288.                                         Importance.LOW,
  289.                                         TRANSACTIONAL_ID_DOC);
  290.     }

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