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Specify the Kafka Topics to Consume

Configure the topics section of the aerospike-kafka-inbound.yml file with the Kafka topics the connector will consume messages from, and how the data in the messages corresponds to the data in your Aerospike database.

Example​

Here is an example of a topics section that specifies two topics to consume from. The names of the topics are users and products.

topics:
  users:
    invalid-record: ignore
    mapping:
      namespace:
        mode: static
        value: users
      set:
        mode: dynamic
        source: value-field
        field-name: city
      key-field:
        source: key
      ttl:
        mode: dynamic
        source: value-field
        field-name: ttl
      bins:
        type: multi-bins
        map:
          name:
            source: value-field
            field-name: firstName
  products:
    invalid-record: kill-task
    mapping:
      namespace:
        mode: dynamic
        source: value-field
        field-name: category
      set:
        mode: dynamic
        source: value-field
        field-name: brand
      digest:
        source: value-field
        field-name: digest
      ttl:
        mode: dynamic
        source: value-field
        field-name: ttl
      bins:
        type: multi-bins
        map:
          name:
            source: value-field
            field-name: prod_name
          price:
            source: value-field
            field-name: prod_price

Configure topics​

For each topic that you name in the topics section, you can set properties in these sections:

OptionRequiredDescription
aerospike-operationnoSpecifies how to apply writes and deletes to your Aerospike database. See Configure Aerospike Operations for details.
invalid-recordyesThe action to take when a Kafka record cannot be parsed or cannot be converted to a valid Aerospike record. Valid values are ignore, kill-task.
mappingin some casesThe mapping of the Kafka record to an Aerospike record. It is required if you do not implement message-transformer for the topic or implement a message-transformer with InboundMessage<K, M>. See Map Kafka messages to Aerospike records for details.
message-transformernoThe configuration parameters for a message transformer. See Aerospike Kafka Sink Message Transformer for details.

Configure Aerospike operations​

Use the aerospike-operation option to specify how to apply writes and deletes to your Aerospike database.

OptionRequiredDefaultDescription
typenowriteSpecifies the type of operation to perform in Aerospike. Valid values are: write, delete.
max-retriesno2Specifies the maximum number of times to retry a transaction.
total-timeoutno0Specifies the number of milliseconds to wait before a transaction time. A value of 0 indicates that there is no time limit.
record-exists-actionnoupdateSpecifies the action to take if a record already exists and type is set to write. Valid values are update, update-only, replace, replace-only, create-only.
send-keynofalseSpecifies to send a user-defined key, in addition to a hash digest. Applies only when the value for the property type is write.
durable-deletenofalseSpecifies to leave a tombstone for the record. Applies only when the value for the property type is delete.
ignore-error-codesnoempty setConsider a record as successfully processed if it throws AerospikeException with the given ResultCode.

Examples​

# An aerospike write operation with all relevant options.
aerospike-operation:
  type: write
  max-retries: 3
  total-timeout: 0
  record-exists-action: update-only
  send-key: true
  ignore-error-codes:
    - 22
    - 13
# An aerospike delete operation with all relevant options.
aerospike-operation:
  type: delete
  max-retries: 3
  total-timeout: 0
  durable-delete: true
  ignore-error-codes:
    - 22
    - 13

Map Kafka messages to Aerospike records​

Use the mapping option to specify how to map Kafka messages in a topic to Aerospike records.

OptionRequiredDescription
namespaceyesSpecifies whether the name of the namespace is set in the configuration file or in messages. See Specify namespace, set, and ttl for details.
setnoSpecifies whether the name of the set is set in the configuration file or in messages. See Specify namespace, set, and ttl for details.
ttlnoSpecifies whether the time to live is set in the configuration file or in messages. See Specify namespace, set, and ttl for details.
binsyesMapping of incoming message to Aerospike bins. See Mapping fields in messages to bins in Aerospike records for details.
key-fieldno*The Field selection configuration value for the Aerospike record key. See Key-field and Digest config for details.
digestno*The Field selection configuration value for the Aerospike record digest. The field has to be a valid Aerospike RIPEMD-160 digest. The digest field should be plain bytes or a Base64 encoded string. See Key-field and Digest config for details.
caution

Either key-field or digest has to be specified in a mapping.

Key-field and Digest config​

Use these two options to generate key-field or digest.

OptionRequiredDescription
sourceyesSource of the value.
field-namenoName of the field to extract the value from. Only applies when source is key-field or value-field.

Possible values for the source option​

ValueDescription
keyUse the whole of the Kafka record key as the value.
key-fieldExtract a value from the Kafka record key.
valueUse the whole of the Kafka record value as the value.
value-fieldExtract a value from the Kafka record value.

Specify namespace, set, and ttl​

Configuration to obtain values for namespace, set, and ttl requires definitions for the following properties:

OptionRequiredDescription
modeyesHow the value of a given field should be obtained. The possible options are static and dynamic.

Static: Specify the values in the configuration file​

To set a static or unchanging name for the namespace, name for the set, or value for the time to live for an Aerospike record, you can use this option:

OptionRequiredDescription
valueyesThe static name or value.

This example sets the name of a namespace to east for all records that an inbound connector creates from the messages that it receives:

mapping:
  ...
  namespace:
    mode: static
    value: east
  ...

This example sets the time to live for all records that an inbound connector creates from the messages that it receives:

mapping:
  ...
  ttl:
    mode: static
    value: -1
  ...

Choose from among the following values when setting the time to live for Aerospike records:

ValueDescription
-2Specifies not to reset the time to live when a record is updated.
-1Specifies that the time to live never expires.
0Specifies to set the time to live to the default that is configured for the namespace in the Aerospike database.
Integer greater than 0Specifies by default the time to live in seconds. However, you can use one of the following suffixes to specify a different unit of time: M for minutes, H for hours, D for days.

Dynamic: Specify message fields from which to obtain values​

Select a value dynamically from the Kafka record.

OptionRequiredDescription
sourceyesSource of the value.
field-namenoName of the field to extract the value from. Only applies when source is key-field or value-field.

Possible values for the source option​

ValueDescription
keyUse the whole of the Kafka record key as the value.
key-fieldExtract a value from the Kafka record key.
valueUse the whole of the Kafka record value as the value.
value-fieldExtract a value from the Kafka record value.

Example​

mapping:
  ...
  namespace:
    mode: dynamic
    source: key-field
    field-name: category
  set:
    mode: dynamic
    source: value-field
    field-name: brand
  ttl:
    mode: dynamic
    source: value-field
    field-name: validForSec
  ...

Mapping fields in messages to bins in Aerospike records​

For topics that you list in the topics section, you must map fields from messages to bins in Aerospike records.

OptionRequiredDescription
typeyesThe number of bins that exist in Aerospike records that correspond to messages in the topic. Valid values are single-bin, multi-bins.

Single bin​

Use these two options to specify the source of the value to write to single-bin Aerospike records.

OptionRequiredDescription
sourceyesSource of the value.
field-namenoName of the field to extract the value from. Only applies when source is key-field or value-field.

Possible values for the source option​

ValueDescription
keyUse the whole of the Kafka record key as the value.
key-fieldExtract a value from the Kafka record key.
valueUse the whole of the Kafka record value as the value.
value-fieldExtract a value from the Kafka record value.

Examples​

# A single bin Aerospike record with the bin value extracted from the Kafka
# record field "name".
bins:
  type: single-bin
  source: value-field
  field-name: name
# A single bin Aerospike record with the bin value equal to the whole of the
# Kafka record value.
bins:
  type: single-bin
  source: value

Multiple bins​

Use these options to specify the source of the values to write to Aerospike records that are comprised of multiple bins.

OptionRequiredDefaultDescription
all-value-fieldsnofalseIndicates if all fields from the Kafka record value should be converted to Aerospike record bins.
all-key-fieldsnofalseIndicates if all fields from the Kafka record key should be converted to Aerospike record bins.
mapnoMap of the Aerospike record bin name to the source of the bin value. Use this option only when both all-value-fields and all-key-fields are false.
sourceyesSource of the value. See the table below for the possible values. Used with the map option
field-namenoName of the field to extract the value from. Only applies when source is key-field or value-field. Used with the map option.

Possible values for the source option​

ValueDescription
keyUse the whole of the Kafka record key as the value.
key-fieldExtract a value from the Kafka record key.
valueUse the whole of the Kafka record value as the value.
value-fieldExtract a value from the Kafka record value.

Examples​

# Write all the Kafka record value fields as Aerospike record bins.
bins:
  type: multi-bins
  all-value-fields: true
# Extract the values of Aerospike bins "name" and "city" from the Kafka fields `firstName` and `residence`.
bins:
  type: multi-bins
  map:
    name:
      source: value-field
      field-name: firstName
    city:
      source: value-field
      field-name: residence
# Use the whole of the Kafka record value as the Aerospike bin "metadata".
bins:
  type: multi-bins
  map:
    metadata:
      source: value
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