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Data Prepper configuration reference

This page lists all supported Data Prepper server, sources, buffers, processors, and sinks, along with their associated options. For example configuration files, see Data Prepper.

Data Prepper server options

Option Required Type Description
ssl No Boolean Indicates whether TLS should be used for server APIs. Defaults to true.
keyStoreFilePath No String Path to a .jks or .p12 keystore file. Required if ssl is true.
keyStorePassword No String Password for keystore. Optional, defaults to empty string.
privateKeyPassword No String Password for private key within keystore. Optional, defaults to empty string.
serverPort No Integer Port number to use for server APIs. Defaults to 4900
metricRegistries No List Metrics registries for publishing the generated metrics. Currently supports Prometheus and CloudWatch. Defaults to Prometheus.

General pipeline options

Option Required Type Description
workers No Integer Essentially the number of application threads. As a starting point for your use case, try setting this value to the number of CPU cores on the machine. Default is 1.
delay No Integer Amount of time in milliseconds workers wait between buffer read attempts. Default is 3,000.

Sources

Sources define where your data comes from.

otel_trace_source

Source for the OpenTelemetry Collector.

Option Required Type Description
port No Integer The port OTel trace source is running on. Default is 21890.
request_timeout No Integer The request timeout in milliseconds. Default is 10_000.
health_check_service No Boolean Enables a gRPC health check service under grpc.health.v1/Health/Check. Default is false.
proto_reflection_service No Boolean Enables a reflection service for Protobuf services (see gRPC reflection and gRPC Server Reflection Tutorial docs). Default is false.
unframed_requests No Boolean Enable requests not framed using the gRPC wire protocol.
thread_count No Integer The number of threads to keep in the ScheduledThreadPool. Default is 200.
max_connection_count No Integer The maximum allowed number of open connections. Default is 500.
ssl No Boolean Enables connections to the OTel source port over TLS/SSL. Defaults to true.
sslKeyCertChainFile Conditionally String File-system path or AWS S3 path to the security certificate (e.g. "config/demo-data-prepper.crt" or "s3://my-secrets-bucket/demo-data-prepper.crt"). Required if ssl is set to true.
sslKeyFile Conditionally String File-system path or AWS S3 path to the security key (e.g. "config/demo-data-prepper.key" or "s3://my-secrets-bucket/demo-data-prepper.key"). Required if ssl is set to true.
useAcmCertForSSL No Boolean Whether to enable TLS/SSL using certificate and private key from AWS Certificate Manager (ACM). Default is false.
acmCertificateArn Conditionally String Represents the ACM certificate ARN. ACM certificate take preference over S3 or local file system certificate. Required if useAcmCertForSSL is set to true.
awsRegion Conditionally String Represents the AWS region to use ACM or S3. Required if useAcmCertForSSL is set to true or sslKeyCertChainFile and sslKeyFile are AWS S3 paths.
authentication No Object An authentication configuration. By default, an unauthenticated server is created for the pipeline. This parameter uses pluggable authentication for HTTPS. To use basic authentication, define the http_basic plugin with a username and password. To provide customer authentication, use or create a plugin that implements GrpcAuthenticationProvider.
record_type No String A string represents the supported record data type that is written into the buffer plugin. Value options are otlp or event. Default is otlp.
otlp No String Otel-trace-source writes each incoming ExportTraceServiceRequest request as record data type into the buffer.
event No String Otel-trace-source decodes each incoming ExportTraceServiceRequest request into a collection of Data Prepper internal spans serving as buffer items. To achieve better performance in this mode, we recommend setting buffer capacity proportional to the estimated number of spans in the incoming request payload.

http_source

This is a source plugin that supports HTTP protocol. Currently ONLY support Json UTF-8 codec for incoming request, e.g. [{"key1": "value1"}, {"key2": "value2"}].

Option Required Type Description
port No Integer The port the source is running on. Default is 2021. Valid options are between 0 and 65535.
request_timeout No Integer The request timeout in millis. Default is 10_000.
thread_count No Integer The number of threads to keep in the ScheduledThreadPool. Default is 200.
max_connection_count No Integer The maximum allowed number of open connections. Default is 500.
max_pending_requests No Integer The maximum number of allowed tasks in ScheduledThreadPool work queue. Default is 1024.
authentication No Object An authentication configuration. By default, this creates an unauthenticated server for the pipeline. This uses pluggable authentication for HTTPS. To use basic authentication define the http_basic plugin with a username and password. To provide customer authentication, use or create a plugin that implements ArmeriaHttpAuthenticationProvider.

otel_metrics_source

Source for the OpenTelemetry Collector for collecting metric data.

Option Required Type Description
port No Integer The port OTel metrics source is running on. Default is 21891.
request_timeout No Integer The request timeout in milliseconds. Default is 10_000.
health_check_service No Boolean Enables a gRPC health check service under grpc.health.v1/Health/Check. Default is false.
proto_reflection_service No Boolean Enables a reflection service for Protobuf services (see gRPC reflection and gRPC Server Reflection Tutorial docs). Default is false.
unframed_requests No Boolean Enable requests not framed using the gRPC wire protocol.
thread_count No Integer The number of threads to keep in the ScheduledThreadPool. Default is 200.
max_connection_count No Integer The maximum allowed number of open connections. Default is 500.
ssl No Boolean Enables connections to the OTel source port over TLS/SSL. Defaults to true.
sslKeyCertChainFile Conditionally String File-system path or AWS S3 path to the security certificate (e.g. "config/demo-data-prepper.crt" or "s3://my-secrets-bucket/demo-data-prepper.crt"). Required if ssl is set to true.
sslKeyFile Conditionally String File-system path or AWS S3 path to the security key (e.g. "config/demo-data-prepper.key" or "s3://my-secrets-bucket/demo-data-prepper.key"). Required if ssl is set to true.
useAcmCertForSSL No Boolean Whether to enable TLS/SSL using certificate and private key from AWS Certificate Manager (ACM). Default is false.
acmCertificateArn Conditionally String Represents the ACM certificate ARN. ACM certificate take preference over S3 or local file system certificates. Required if useAcmCertForSSL is set to true.
awsRegion Conditionally String Represents the AWS Region to use ACM or S3. Required if useAcmCertForSSL is set to true or sslKeyCertChainFile and sslKeyFile are AWS S3 paths.
authentication No Object An authentication configuration. By default, an unauthenticated server is created for the pipeline. This uses pluggable authentication for HTTPS. To use basic authentication, define the http_basic plugin with a username and password. To provide customer authentication, use or create a plugin that implements GrpcAuthenticationProvider.

file

Source for flat file input.

Option Required Type Description
path Yes String Path to the input file (e.g. logs/my-log.log).
format No String Format of each line in the file. Valid options are json or plain. Default is plain.
record_type No String The record type to store. Valid options are string or event. Default is string. If you would like to use the file source for log analytics use cases like grok, set this option to event.

pipeline

Source for reading from another pipeline.

Option Required Type Description
name Yes String Name of the pipeline to read from.

stdin

Source for console input. Can be useful for testing. No options.

Buffers

Buffers store data as it passes through the pipeline. If you implement a custom buffer, it can be memory-based (better performance) or disk-based (larger).

bounded_blocking

The default buffer. Memory-based.

Option Required Type Description
buffer_size No Integer The maximum number of records the buffer accepts. Default is 512.
batch_size No Integer The maximum number of records the buffer drains after each read. Default is 8.

Processors

Processors perform some action on your data: filter, transform, enrich, etc.

Prior to Data Prepper 1.3, Processors were named Preppers. Starting in Data Prepper 1.3, the term Prepper is deprecated in favor of Processor. Data Prepper will continue to support the term “Prepper” until 2.0, where it will be removed.

otel_trace_raw_prepper

Converts OpenTelemetry data to OpenSearch-compatible JSON documents and fills in trace group related fields in those JSON documents. It requires record_type to be set as otlp in otel_trace_source.

Option Required Type Description
trace_flush_interval No Integer Represents the time interval in seconds to flush all the descendant spans without any root span. Default is 180.

otel_trace_raw

This processor is a Data Prepper event record type compatible version of otel_trace_raw_prepper that fills in trace group related fields into all incoming Data Prepper span records. It requires record_type to be set as event in otel_trace_source.

Option Required Type Description
trace_flush_interval No Integer Represents the time interval in seconds to flush all the descendant spans without any root span. Default is 180.

service_map_stateful

Uses OpenTelemetry data to create a distributed service map for visualization in OpenSearch Dashboards.

Option Required Type Description
window_duration No Integer Represents the fixed time window in seconds to evaluate service-map relationships. Default is 180.

peer_forwarder

Forwards ExportTraceServiceRequests via gRPC to other Data Prepper instances. Required for operating Data Prepper in a clustered deployment.

Option Required Type Description
time_out No Integer Forwarded request timeout in seconds. Defaults to 3 seconds.
span_agg_count No Integer Batch size for number of spans per request. Defaults to 48.
target_port No Integer The destination port to forward requests to. Defaults to 21890.
discovery_mode No String Peer discovery mode to be used. Allowable values are static, dns, and aws_cloud_map. Defaults to static.
static_endpoints No List List containing string endpoints of all Data Prepper instances.
domain_name No String Single domain name to query DNS against. Typically used by creating multiple DNS A Records for the same domain.
ssl No Boolean Indicates whether to use TLS. Default is true.
awsCloudMapNamespaceName Conditionally String Name of your CloudMap Namespace. Required if discovery_mode is set to aws_cloud_map.
awsCloudMapServiceName Conditionally String Service name within your CloudMap Namespace. Required if discovery_mode is set to aws_cloud_map.
sslKeyCertChainFile Conditionally String Represents the SSL certificate chain file path or AWS S3 path. S3 path example s3://<bucketName>/<path>. Required if ssl is set to true.
useAcmCertForSSL No Boolean Enables TLS/SSL using certificate and private key from AWS Certificate Manager (ACM). Default is false.
awsRegion Conditionally String Represents the AWS Region to use ACM, S3, or CloudMap. Required if useAcmCertForSSL is set to true or sslKeyCertChainFile and sslKeyFile are AWS S3 paths.
acmCertificateArn Conditionally String Represents the ACM certificate ARN. ACM certificate take preference over S3 or local file system certificate. Required if useAcmCertForSSL is set to true.

string_converter

Converts string to uppercase or lowercase. Mostly useful as an example if you want to develop your own processor.

Option Required Type Description
upper_case No Boolean Whether to convert to uppercase (true) or lowercase (false).

aggregate

Groups events together based on the keys provided and performs a action on each group.

Option Required Type Description
identification_keys Yes List A unordered list by which to group Events. Events with the same values for these keys are put into the same group. If an Event does not contain one of the identification_keys, then the value of that key is considered to be equal to null. At least one identification_key is required. (e.g. ["sourceIp", "destinationIp", "port"]).
action Yes AggregateAction The action to be performed for each group. One of the available Aggregate Actions must be provided or you can create custom aggregate actions. remove_duplicates and put_all are available actions. For more information, see creating custom aggregate actions.
group_duration No String The amount of time that a group should exist before it is concluded automatically. Supports ISO_8601 notation strings (“PT20.345S”, “PT15M”, etc.) as well as simple notation for seconds ("60s") and milliseconds ("1500ms"). Default value is 180s.

date

Adds a default timestamp to the event or parses timestamp fields, and converts it to ISO 8601 format, which can be used as event timestamp.

Option Required Type Description
match Conditionally List List of key and patterns where patterns is a list. The list of match can have exactly one key and patterns. There is no default value. This option cannot be defined at the same time as from_time_received. Include multiple date processors in your pipeline if both options should be used.
from_time_received Conditionally Boolean A boolean that is used for adding default timestamp to event data from event metadata which is the time when source receives the event. Default value is false. This option cannot be defined at the same time as match. Include multiple date processors in your pipeline if both options should be used.
destination No String Field to store the timestamp parsed by date processor. It can be used with both match and from_time_received. Default value is @timestamp.
source_timezone No String Time zone used to parse dates. It is used in case zone or offset cannot be extracted from the value. If zone or offset are part of the value, then timezone is ignored. Find all the available timezones the list of database time zones in the “TZ database name” column.
destination_timezone No String Timezone used for storing timestamp in destination field. The available timezone values are the same as source_timestamp.
locale No String Locale is used for parsing dates. It’s commonly used for parsing month names(MMM). It can have language, country and variant fields using IETF BCP 47 or String representation of Locale object. For example en-US for IETF BCP 47 and en_US for string representation of Locale. Full list of locale fields which includes language, country and variant can be found the language subtag registry. Default value is Locale.ROOT.

drop_events

Drops all the events that are passed into this processor.

Option Required Type Description
drop_when Yes String Accepts a Data Prepper Expression string following the Data Prepper Expression Syntax. Configuring drop_events with drop_when: true drops all the events received.
handle_failed_events No Enum Specifies how exceptions are handled when an exception occurs while evaluating an event. Default value is drop, which drops the event so it doesn’t get sent to OpenSearch. Available options are drop, drop_silently, skip, skip_silently. For more information, see handle_failed_events.

grok_prepper

Takes unstructured data and utilizes pattern matching to structure and extract important keys and make data more structured and queryable.

Option Required Type Description
match No Map Specifies which keys to match specific patterns against. Default is an empty body.
keep_empty_captures No Boolean Enables preserving null captures. Default value is false.
named_captures_only No Boolean enables whether to keep only named captures. Default value is true.
break_on_match No Boolean Specifies whether to match all patterns or stop once the first successful match is found. Default is true.
keys_to_overwrite No List Specifies which existing keys are to be overwritten if there is a capture with the same key value. Default is [].
pattern_definitions No Map Allows for custom pattern use inline. Default value is an empty body.
patterns_directories No List Specifies the path of directories that contain customer pattern files. Default value is an empty list.
pattern_files_glob No String Specifies which pattern files to use from the directories specified for pattern_directories. Default is *.
target_key No String Specifies a parent level key to store all captures. Default value is null.
timeout_millis No Integer Maximum amount of time that should take place for the matching. Setting to 0 disables the timeout. Default value is 30,000.

key_value

Takes in a field and parses it into key/value pairs.

Option Required Type Description
source No String The key in the event that is parsed. Default value is message.
destination No String The key where to output the parsed source to. Doing so overwrites the value of the key if it exists. Default value is parsed_message
field_delimiter_regex Conditionally String A regex specifying the delimiter between key/value pairs. Special regex characters such as [ and ] must be escaped using \\. This option cannot be defined at the same time as field_split_characters.
field_split_characters Conditionally String A string of characters to split between key/value pairs. Special regex characters such as [ and ] must be escaped using \\. Default value is &. This option cannot be defined at the same time as field_delimiter_regex.
key_value_delimiter_regex Conditionally String A regex specifying the delimiter between a key and a value. Special regex characters such as [ and ] must be escaped using \\. There is no default value. This option cannot be defined at the same time as value_split_characters.
value_split_characters Conditionally String A string of characters to split between keys and values. Special regex characters such as [ and ] must be escaped using \\. Default value is =. This option cannot be defined at the same time as key_value_delimiter_regex.
non_match_value No String When a key/value cannot be successfully split, the key/value is be placed in the key field and the specified value in the value field. Default value is null.
prefix No String A prefix given to all keys. Default value is empty string.
delete_key_regex No String A regex used to delete characters from the key. Special regex characters such as [ and ] must be escaped using \\. There is no default value.
delete_value_regex No String A regex used to delete characters from the value. Special regex characters such as [ and ] must be escaped using \\. There is no default value.

add_entries

Adds an entry to event. add_entries is part of mutate event processors.

Option Required Type Description
entries Yes List List of events to be added. Valid entries are key, value, and overwrite_if_key_exists.
key N/A N/A Key of the new event to be added.
value N/A N/A Value of the new entry to be added. Valid data types are strings, booleans, numbers, null, nested objects, and arrays containing the aforementioned data types.
overwrite_if_key_exists No Boolean If true, the existing value gets overwritten if the key already exists within the event. Default is false.

copy_values

Copy values within an event. copy_values is part of mutate event processors.

Option Required Type Description
entries Yes List List of entries to be copied. Valid values are from_key, to_key, and overwrite_if_key_exists.
from_key N/A N/A The key of the entry to be copied.
to_key N/A N/A The key of the new entry to be added.
overwrite_if_to_key_exists No Boolean If true, the existing value gets overwritten if the key already exists within the event. Default is false.

delete_entries

Delete entries in an event. delete_entries is part of mutate event processors.

Option Required Type Description
with_keys Yes List An array of keys of the entries to be deleted.

rename_keys

Rename keys in an event. rename_keys is part of mutate event processors.

Option Required Type Description
entries Yes List List of entries. Valid values are from_key, to_key, and overwrite_if_key_exists. Renaming occurs in the order defined.
from_key N/A N/A The key of the entry to be renamed.
to_key N/A N/A The new key of the entry.
overwrite_if_to_key_exists No Boolean If true, the existing value gets overwritten if to_key already exists in the event.

substitute_string

Matches a key’s value against a regular expression and replaces all matches with a replacement string. substitute_string is part of mutate string processors.

Option Required Type Description
entries Yes List List of entries. Valid values are source, from, and to.
source N/A N/A The key to modify.
from N/A N/A The Regex String to be replaced. Special regex characters such as [ and ] must be escaped using \\ when using double quotes and \ when using single quotes. See Java Patterns for more information.
to N/A N/A The String to be substituted for each match of from.

split_string

Splits a field into an array using a delimiter character. split_string is part of mutate string processors.

Option Required Type Description
entries Yes List List of entries. Valid values are source, delimiter, and delimiter_regex.
source N/A N/A The key to split.
delimiter No N/A The separator character responsible for the split. Cannot be defined at the same time as delimiter_regex. At least delimiter or delimiter_regex must be defined.
delimiter_regex No N/A The regex string responsible for the split. Cannot be defined at the same time as delimiter. At least delimiter or delimiter_regex must be defined.

uppercase_string

Converts a string to its uppercase counterpart. uppercase_string is part of mutate string processors.

Option Required Type Description
with_keys Yes List A list of keys to convert to uppercase.

lowercase_string

Converts a string to its lowercase counterpart. lowercase_string is part of mutate string processors.

Option Required Type Description
with_keys Yes List A list of keys to convert to lowercase.

trim_string

Strips whitespace from the beginning and end of a key. trim_string is part of mutate string processors.

Option Required Type Description
with_keys Yes List A list of keys to trim the whitespace from.

Sinks

Sinks define where Data Prepper writes your data to.

opensearch

Sink for an OpenSearch cluster.

Option Required Type Description
hosts Yes List List of OpenSearch hosts to write to (e.g. ["https://localhost:9200", "https://remote-cluster:9200"]).
cert No String Path to the security certificate (e.g. "config/root-ca.pem") if the cluster uses the OpenSearch security plugin.
username No String Username for HTTP basic authentication.
password No String Password for HTTP basic authentication.
aws_sigv4 No Boolean default false. Whether to use IAM signing to connect to an Amazon OpenSearch Service domain. For your access key, secret key, and optional session token, Data Prepper uses the default credential chain (environment variables, Java system properties, ~/.aws/credential, etc.).
aws_region No String AWS region (e.g. "us-east-1") for the domain if you are connecting to Amazon OpenSearch Service.
aws_sts_role_arn No String IAM role which the sink plugin assumes to sign request to Amazon OpenSearch Service. If not provided the plugin uses the default credentials.
socket_timeout No Integer the timeout in milliseconds for waiting for data (or, put differently, a maximum period inactivity between two consecutive data packets). A timeout value of zero is interpreted as an infinite timeout. If this timeout value is either negative or not set, the underlying Apache HttpClient would rely on operating system settings for managing socket timeouts.
connect_timeout No Integer The timeout in milliseconds used when requesting a connection from the connection manager. A timeout value of zero is interpreted as an infinite timeout. If this timeout value is either negative or not set, the underlying Apache HttpClient would rely on operating system settings for managing connection timeouts.
insecure No Boolean Whether to verify SSL certificates. If set to true, CA certificate verification is disabled and insecure HTTP requests are sent instead. Default is false.
proxy No String The address of a forward HTTP proxy server. The format is “<host name or IP>:<port>”. Examples: “example.com:8100”, “http://example.com:8100”, “112.112.112.112:8100”. Port number cannot be omitted.
trace_analytics_raw No Boolean Deprecated in favor of index_type. Whether to export as trace data to the otel-v1-apm-span-* index pattern (alias otel-v1-apm-span) for use with the Trace Analytics OpenSearch Dashboards plugin. Default is false.
trace_analytics_service_map No Boolean Deprecated in favor of index_type. Whether to export as trace data to the otel-v1-apm-service-map index for use with the service map component of the Trace Analytics OpenSearch Dashboards plugin. Default is false.
index No String Name of the index to export to. Only required if you don’t use the trace-analytics-raw or trace-analytics-service-map presets. In other words, this parameter is applicable and required only if index_type is explicitly custom or defaults to custom.
index_type No String This index type instructs the Sink plugin what type of data it is handling. Valid values: custom, trace-analytics-raw, trace-analytics-service-map. Default is custom.
template_file No String Path to a JSON index template file (e.g. /your/local/template-file.json if you do not use the trace_analytics_raw or trace_analytics_service_map.) See otel-v1-apm-span-index-template.json for an example.
document_id_field No String The field from the source data to use for the OpenSearch document ID (e.g. "my-field") if you don’t use the trace_analytics_raw or trace_analytics_service_map presets.
dlq_file No String The path to your preferred dead letter queue file (e.g. /your/local/dlq-file). Data Prepper writes to this file when it fails to index a document on the OpenSearch cluster.
bulk_size No Integer (long) The maximum size (in MiB) of bulk requests to the OpenSearch cluster. Values below 0 indicate an unlimited size. If a single document exceeds the maximum bulk request size, Data Prepper sends it individually. Default is 5.
ism_policy_file No String The absolute file path for an ISM (Index State Management) policy JSON file. This policy file is effective only when there is no built-in policy file for the index type. For example, custom index type is currently the only one without a built-in policy file, thus it would use the policy file here if it’s provided through this parameter. For more information, see ISM policies.
number_of_shards No Integer The number of primary shards that an index should have on the destination OpenSearch server. This parameter is effective only when template_file is either explicitly provided in Sink configuration or built-in. If this parameter is set, it would override the value in index template file. For more information, see create index.
number_of_replicas No Integer The number of replica shards each primary shard should have on the destination OpenSearch server. For example, if you have 4 primary shards and set number_of_replicas to 3, the index has 12 replica shards. This parameter is effective only when template_file is either explicitly provided in Sink configuration or built-in. If this parameter is set, it would override the value in index template file. For more information, see create index.

file

Sink for flat file output.

Option Required Type Description
path Yes String Path for the output file (e.g. logs/my-transformed-log.log).

pipeline

Sink for writing to another pipeline.

Option Required Type Description
name Yes String Name of the pipeline to write to.

stdout

Sink for console output. Can be useful for testing. No options.