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datahub/docs/deploy/environment-vars.md

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docs(deploy): document some of the environment variables (#7906)
2023-04-28 16:15:56 -05:00
---
title: "Deployment Environment Variables"
---
# Environment Variables
The following is a summary of a few important environment variables which expose various levers which control how
DataHub works.
## Feature Flags
fix(consumer): fix datahub usage event topic consumer (#7866)
2023-05-01 09:28:11 -05:00
| Variable | Default | Unit/Type | Components | Description |
|--------------------------------------------------|---------|-----------|-----------------------------------------|-----------------------------------------------------------------------------------------------------------------------------|
| `UI_INGESTION_ENABLED` | `true` | boolean | [`GMS`, `MCE Consumer`] | Enable UI based ingestion. |
| `DATAHUB_ANALYTICS_ENABLED` | `true` | boolean | [`Frontend`, `GMS`] | Collect DataHub usage to populate the analytics dashboard. | |
| `BOOTSTRAP_SYSTEM_UPDATE_WAIT_FOR_SYSTEM_UPDATE` | `true` | boolean | [`GMS`, `MCE Consumer`, `MAE Consumer`] | Do not wait for the `system-update` to complete before starting. This should typically only be disabled during development. |
docs(deploy): document some of the environment variables (#7906)
2023-04-28 16:15:56 -05:00
## Ingestion
| Variable | Default | Unit/Type | Components | Description |
|------------------------------------|---------|-----------|-------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `ASYNC_INGESTION_DEFAULT` | `false` | boolean | [`GMS`] | Asynchronously process ingestProposals by writing the ingestion MCP to Kafka. Typically enabled with standalone consumers. |
| `MCP_CONSUMER_ENABLED` | `true` | boolean | [`GMS`, `MCE Consumer`] | When running in standalone mode, disabled on `GMS` and enabled on separate `MCE Consumer`. |
| `MCL_CONSUMER_ENABLED` | `true` | boolean | [`GMS`, `MAE Consumer`] | When running in standalone mode, disabled on `GMS` and enabled on separate `MAE Consumer`. |
| `PE_CONSUMER_ENABLED` | `true` | boolean | [`GMS`, `MAE Consumer`] | When running in standalone mode, disabled on `GMS` and enabled on separate `MAE Consumer`. |
| `ES_BULK_REQUESTS_LIMIT` | 1000 | docs | [`GMS`, `MAE Consumer`] | Number of bulk documents to index. `MAE Consumer` if standalone. |
| `ES_BULK_FLUSH_PERIOD` | 1 | seconds | [`GMS`, `MAE Consumer`] | How frequently indexed documents are made available for query. |
| `ALWAYS_EMIT_CHANGE_LOG` | `false` | boolean | [`GMS`] | Enables always emitting a MCL even when no changes are detected. Used for Time Based Lineage when no changes occur. | |
| `GRAPH_SERVICE_DIFF_MODE_ENABLED` | `true` | boolean | [`GMS`] | Enables diff mode for graph writes, uses a different code path that produces a diff from previous to next to write relationships instead of wholesale deleting edges and reading. |
## Caching
| Variable | Default | Unit/Type | Components | Description |
|--------------------------------------------|----------|-----------|------------|--------------------------------------------------------------------------------------|
| `SEARCH_SERVICE_ENABLE_CACHE` | `false` | boolean | [`GMS`] | Enable caching of search results. |
| `SEARCH_SERVICE_CACHE_IMPLEMENTATION` | caffeine | string | [`GMS`] | Set to `hazelcast` if the number of GMS replicas > 1 for enabling distributed cache. |
| `CACHE_TTL_SECONDS` | 600 | seconds | [`GMS`] | Default cache time to live. |
| `CACHE_MAX_SIZE` | 10000 | objects | [`GMS`] | Maximum number of items to cache. |
| `LINEAGE_SEARCH_CACHE_ENABLED` | `true` | boolean | [`GMS`] | Enables in-memory cache for searchAcrossLineage query. |
| `CACHE_ENTITY_COUNTS_TTL_SECONDS` | 600 | seconds | [`GMS`] | Homepage entity count time to live. |
| `CACHE_SEARCH_LINEAGE_TTL_SECONDS` | 86400 | seconds | [`GMS`] | Search lineage cache time to live. |
| `CACHE_SEARCH_LINEAGE_LIGHTNING_THRESHOLD` | 300 | objects | [`GMS`] | Lineage graphs exceeding this limit will use a local cache. |
## Search
| Variable | Default | Unit/Type | Components | Description |
|-----------------------------------------------------|------------------------|-----------|-----------------------------------------------------------------|--------------------------------------------------------------------------|
| `INDEX_PREFIX` | `` | string | [`GMS`, `MAE Consumer`, `Elasticsearch Setup`, `System Update`] | Prefix Elasticsearch indices with the given string. |
| `ELASTICSEARCH_NUM_SHARDS_PER_INDEX` | 1 | integer | [`System Update`] | Default number of shards per Elasticsearch index. |
| `ELASTICSEARCH_NUM_REPLICAS_PER_INDEX` | 1 | integer | [`System Update`] | Default number of replica per Elasticsearch index. |
| `ELASTICSEARCH_BUILD_INDICES_RETENTION_VALUE` | 60 | integer | [`System Update`] | Number of units for the retention of Elasticsearch clone/backup indices. |
| `ELASTICSEARCH_BUILD_INDICES_RETENTION_UNIT` | DAYS | string | [`System Update`] | Unit for the retention of Elasticsearch clone/backup indices. |
| `ELASTICSEARCH_QUERY_EXACT_MATCH_EXCLUSIVE` | `false` | boolean | [`GMS`] | Only return exact matches when using quotes. |
| `ELASTICSEARCH_QUERY_EXACT_MATCH_WITH_PREFIX` | `true` | boolean | [`GMS`] | Include prefix match in exact match results. |
| `ELASTICSEARCH_QUERY_EXACT_MATCH_FACTOR` | 10.0 | float | [`GMS`] | Multiply by this number on true exact match. |
| `ELASTICSEARCH_QUERY_EXACT_MATCH_PREFIX_FACTOR` | 1.6 | float | [`GMS`] | Multiply by this number when prefix match. |
| `ELASTICSEARCH_QUERY_EXACT_MATCH_CASE_FACTOR` | 0.7 | float | [`GMS`] | Multiply by this number when case insensitive match. |
| `ELASTICSEARCH_QUERY_EXACT_MATCH_ENABLE_STRUCTURED` | `true` | boolean | [`GMS`] | When using structured query, also include exact matches. |
| `ELASTICSEARCH_QUERY_PARTIAL_URN_FACTOR` | 0.5 | float | [`GMS`] | Multiply by this number when partial token match on URN) |
| `ELASTICSEARCH_QUERY_PARTIAL_FACTOR` | 0.4 | float | [`GMS`] | Multiply by this number when partial token match on non-URN field. |
| `ELASTICSEARCH_QUERY_CUSTOM_CONFIG_ENABLED` | `false` | boolean | [`GMS`] | Enable search query and ranking customization configuration. |
| `ELASTICSEARCH_QUERY_CUSTOM_CONFIG_FILE` | `search_config.yml` | string | [`GMS`] | The location of the search customization configuration. |
## Kafka
In general, there are **lots** of Kafka configuration environment variables for both the producer and consumers defined in the official Spring Kafka documentation [here](https://docs.spring.io/spring-boot/docs/2.7.10/reference/html/application-properties.html#appendix.application-properties.integration).
These environment variables follow the standard Spring representation of properties as environment variables.
Simply replace the dot, `.`, with an underscore, `_`, and convert to uppercase.
| Variable | Default | Unit/Type | Components | Description |
|------------------------------------------------------|----------|-----------|------------------------------------------|--------------------------------------------------------------------------------------------------|
| `KAFKA_LISTENER_CONCURRENCY` | 1 | integer | [`GMS`, `MCE Consumer`, `MAE Consumer`] | Number of Kafka consumer threads. Optimize throughput by matching to topic partitions. |
| `SPRING_KAFKA_PRODUCER_PROPERTIES_MAX_REQUEST_SIZE` | 1048576 | bytes | [`GMS`, `MCE Consumer`, `MAE Consumer`] | Max produced message size. Note that the topic configuration is not controlled by this variable. |
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