Add rack_id field for Kafka components

CHANGELOG.md

@@ -9,6 +9,7 @@ All notable changes to this project will be documented in this file.
 
 - Fields `cache_control`, `content_disposition`, `content_language` and `website_redirect_location` added to the `aws_s3` output.
 - Field `cors.enabled` and `cors.allowed_origins` added to the server wide `http` config.
+- For Kafka components the config now supports the `rack_id` field which may contain a rack identifier for the Kafka client.
 - Allow mapping imports in Bloblang environments to be disabled.
 
 ### Fixed

lib/input/kafka.go

@@ -74,6 +74,7 @@ You can access these metadata fields using [function interpolation](/docs/config
 			sasl.FieldSpec(),
 			docs.FieldCommon("consumer_group", "An identifier for the consumer group of the connection. This field can be explicitly made empty in order to disable stored offsets for the consumed topic partitions."),
 			docs.FieldCommon("client_id", "An identifier for the client connection."),
+			docs.FieldAdvanced("rack_id", "A rack identifier for this client."),
 			docs.FieldAdvanced("start_from_oldest", "If an offset is not found for a topic partition, determines whether to consume from the oldest available offset, otherwise messages are consumed from the latest offset."),
 			docs.FieldCommon(
 				"checkpoint_limit", "EXPERIMENTAL: The maximum number of messages of the same topic and partition that can be processed at a given time. Increasing this limit enables parallel processing and batching at the output level to work on individual partitions. Any given offset will not be committed unless all messages under that offset are delivered in order to preserve at least once delivery guarantees.",
@@ -462,6 +463,7 @@ func (k *kafkaReader) ConnectWithContext(ctx context.Context) error {
 
 	config := sarama.NewConfig()
 	config.ClientID = k.conf.ClientID
+	config.RackID = k.conf.RackID
 	config.Net.DialTimeout = time.Second
 	config.Version = k.version
 	config.Consumer.Return.Errors = true

lib/input/kafka_balanced.go

@@ -64,6 +64,7 @@ You can access these metadata fields using
 			sasl.FieldSpec(),
 			docs.FieldCommon("topics", "A list of topics to consume from. If an item of the list contains commas it will be expanded into multiple topics.").Array(),
 			docs.FieldCommon("client_id", "An identifier for the client connection."),
+			docs.FieldAdvanced("rack_id", "A rack identifier for this client."),
 			docs.FieldCommon("consumer_group", "An identifier for the consumer group of the connection."),
 			docs.FieldAdvanced("start_from_oldest", "If an offset is not found for a topic partition, determines whether to consume from the oldest available offset, otherwise messages are consumed from the latest offset."),
 			docs.FieldAdvanced("commit_period", "The period of time between each commit of the current partition offsets. Offsets are always committed during shutdown."),

lib/input/reader/kafka.go

@@ -27,6 +27,7 @@ type KafkaConfig struct {
 	Addresses           []string                 `json:"addresses" yaml:"addresses"`
 	Topics              []string                 `json:"topics" yaml:"topics"`
 	ClientID            string                   `json:"client_id" yaml:"client_id"`
+	RackID              string                   `json:"rack_id" yaml:"rack_id"`
 	ConsumerGroup       string                   `json:"consumer_group" yaml:"consumer_group"`
 	Group               KafkaBalancedGroupConfig `json:"group" yaml:"group"`
 	CommitPeriod        string                   `json:"commit_period" yaml:"commit_period"`
@@ -60,6 +61,7 @@ func NewKafkaConfig() KafkaConfig {
 		Addresses:           []string{"localhost:9092"},
 		Topics:              []string{},
 		ClientID:            "benthos_kafka_input",
+		RackID:              "",
 		ConsumerGroup:       "benthos_consumer_group",
 		Group:               NewKafkaBalancedGroupConfig(),
 		CommitPeriod:        "1s",

lib/input/reader/kafka_balanced.go

@@ -44,6 +44,7 @@ func NewKafkaBalancedGroupConfig() KafkaBalancedGroupConfig {
 type KafkaBalancedConfig struct {
 	Addresses           []string                 `json:"addresses" yaml:"addresses"`
 	ClientID            string                   `json:"client_id" yaml:"client_id"`
+	RackID              string                   `json:"rack_id" yaml:"rack_id"`
 	ConsumerGroup       string                   `json:"consumer_group" yaml:"consumer_group"`
 	Group               KafkaBalancedGroupConfig `json:"group" yaml:"group"`
 	CommitPeriod        string                   `json:"commit_period" yaml:"commit_period"`
@@ -65,6 +66,7 @@ func NewKafkaBalancedConfig() KafkaBalancedConfig {
 	return KafkaBalancedConfig{
 		Addresses:           []string{"localhost:9092"},
 		ClientID:            "benthos_kafka_input",
+		RackID:              "",
 		ConsumerGroup:       "benthos_consumer_group",
 		Group:               NewKafkaBalancedGroupConfig(),
 		CommitPeriod:        "1s",
@@ -274,6 +276,7 @@ func (k *KafkaBalanced) Connect() error {
 
 	config := sarama.NewConfig()
 	config.ClientID = k.conf.ClientID
+	config.RackID = k.conf.RackID
 	config.Net.DialTimeout = time.Second
 	config.Version = k.version
 	config.Consumer.Return.Errors = true

lib/input/reader/kafka_cg.go

@@ -294,6 +294,7 @@ func (k *KafkaCG) ConnectWithContext(ctx context.Context) error {
 
 	config := sarama.NewConfig()
 	config.ClientID = k.conf.ClientID
+	config.RackID = k.conf.RackID
 	config.Net.DialTimeout = time.Second
 	config.Version = k.version
 	config.Consumer.Return.Errors = true

lib/output/kafka.go

@@ -45,6 +45,7 @@ However, this also means that manual intervention will eventually be required in
 			sasl.FieldSpec(),
 			docs.FieldCommon("topic", "The topic to publish messages to.").IsInterpolated(),
 			docs.FieldCommon("client_id", "An identifier for the client connection."),
+			docs.FieldAdvanced("rack_id", "A rack identifier for this client."),
 			docs.FieldCommon("key", "The key to publish messages with.").IsInterpolated(),
 			docs.FieldCommon("partitioner", "The partitioning algorithm to use.").HasOptions("fnv1a_hash", "murmur2_hash", "random", "round_robin", "manual"),
 			docs.FieldAdvanced("partition", "The manually-specified partition to publish messages to, relevant only when the field `partitioner` is set to `manual`. Must be able to parse as a 32-bit integer.").IsInterpolated(),

lib/output/writer/kafka.go

@@ -31,6 +31,7 @@ import (
 type KafkaConfig struct {
 	Addresses        []string    `json:"addresses" yaml:"addresses"`
 	ClientID         string      `json:"client_id" yaml:"client_id"`
+	RackID           string      `json:"rack_id" yaml:"rack_id"`
 	Key              string      `json:"key" yaml:"key"`
 	Partitioner      string      `json:"partitioner" yaml:"partitioner"`
 	Partition        string      `json:"partition" yaml:"partition"`
@@ -64,6 +65,7 @@ func NewKafkaConfig() KafkaConfig {
 	return KafkaConfig{
 		Addresses:            []string{"localhost:9092"},
 		ClientID:             "benthos_kafka_output",
+		RackID:               "",
 		Key:                  "",
 		RoundRobinPartitions: false,
 		Partitioner:          "fnv1a_hash",
@@ -292,6 +294,7 @@ func (k *Kafka) Connect() error {
 
 	config := sarama.NewConfig()
 	config.ClientID = k.conf.ClientID
+	config.RackID = k.conf.RackID
 
 	config.Version = k.version
 

website/docs/components/inputs/kafka.md

@@ -66,6 +66,7 @@ input:
       token_key: ""
     consumer_group: benthos_consumer_group
     client_id: benthos_kafka_input
+    rack_id: ""
     start_from_oldest: true
     checkpoint_limit: 1
     commit_period: 1s
@@ -373,6 +374,14 @@ An identifier for the client connection.
 Type: `string`  
 Default: `"benthos_kafka_input"`  
 
+### `rack_id`
+
+A rack identifier for this client.
+
+
+Type: `string`  
+Default: `""`  
+
 ### `start_from_oldest`
 
 If an offset is not found for a topic partition, determines whether to consume from the oldest available offset, otherwise messages are consumed from the latest offset.

website/docs/components/inputs/kafka_balanced.md

@@ -75,6 +75,7 @@ input:
     topics:
       - benthos_stream
     client_id: benthos_kafka_input
+    rack_id: ""
     consumer_group: benthos_consumer_group
     start_from_oldest: true
     commit_period: 1s
@@ -363,6 +364,14 @@ An identifier for the client connection.
 Type: `string`  
 Default: `"benthos_kafka_input"`  
 
+### `rack_id`
+
+A rack identifier for this client.
+
+
+Type: `string`  
+Default: `""`  
+
 ### `consumer_group`
 
 An identifier for the consumer group of the connection.

website/docs/components/outputs/kafka.md

@@ -75,6 +75,7 @@ output:
       token_key: ""
     topic: benthos_stream
     client_id: benthos_kafka_output
+    rack_id: ""
     key: ""
     partitioner: fnv1a_hash
     partition: ""
@@ -360,6 +361,14 @@ An identifier for the client connection.
 Type: `string`  
 Default: `"benthos_kafka_output"`  
 
+### `rack_id`
+
+A rack identifier for this client.
+
+
+Type: `string`  
+Default: `""`  
+
 ### `key`
 
 The key to publish messages with.