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90 lines
5.4 KiB
Markdown
90 lines
5.4 KiB
Markdown
# How to onboard to GMA search?
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> Refer to [this doc](./search-over-new-field.md) if you're only interested in indexing a new field of an existing entity
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## 1. Define search document model for the entity
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Modeling is the most important and crucial part of your design.
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[Search document] model contains a list of fields that need to be indexed along with the names and their data types.
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Check [here][Search document] to learn more about search document model.
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Please note that all fields in the search document model (except the `urn`) are `optional`.
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This is because we want to support partial updates to search documents.
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[Search document]: ../what/search-document.md
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## 2. Create the search index, define its mappings and settings
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A [mapping] is created using the information of search document model.
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It defines how a document, and the fields it contains, are stored and indexed by various [tokenizers], [analyzers] and data type for the fields.
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For certain fields, sub-fields are created using different analyzers.
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The analyzers are chosen depending on the needs for each field.
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This is currently created manually using [curl] commands, and we plan to [automate](../what/search-index.md#search-automation-tbd) the process in the near future.
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Check index [mappings & settings](../../docker/elasticsearch/dataset-index-config.json) for `dataset` search index.
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## 3. Ingestion into search index
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The actual indexing process for each [entity] is powered by [index builders].
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The builders register the metadata [aspects] of their interest against [MAE Consumer Job] and will be invoked whenever an [MAE] of same interest is received.
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Index builders should be extended from [BaseIndexBuilder]. Check [DatasetIndexBuilder] as an example.
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For the consumer job to consume those MAEs, you should add your index builder to the [index builder registry].
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## 4. Search query configs
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Once you have the [search index] built, it's ready to be queried!
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The search query is constructed and executed through [Search DAO].
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The raw search hits are retrieved and extracted using the base model.
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Besides the regular full text search, run time aggregation and relevance are provided in the search queries as well.
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[ESSearchDAO] is the implementation for the [BaseSearchDAO] for Elasticsearch.
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It's still a generic class which can be used for a specific [entity] and configured using [BaseSearchConfig].
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BaseSearchConfig is the abstraction for all query related configurations such as query templates, default field to execute autocomplete on etc.
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```java
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public abstract class BaseSearchConfig<DOCUMENT extends RecordTemplate> {
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public abstract Set<String> getFacetFields();
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public String getIndexName() {
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return getSearchDocument().getSimpleName().toLowerCase();
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}
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public abstract Class<DOCUMENT> getSearchDocument();
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public abstract String getDefaultAutocompleteField();
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public abstract String getSearchQueryTemplate();
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public abstract String getAutocompleteQueryTemplate();
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}
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```
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[DatasetSearchConfig] is the implementation of search config for `dataset` entity.
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Search query templates for various entities can be found [here](https://github.com/linkedin/datahub/tree/master/gms/impl/src/main/resources).
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## 5. Add search query endpoints to GMS
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Finally, you need to create [rest.li](https://rest.li) APIs to serve your search queries.
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[BaseSearchableEntityResource] provides an abstract implementation of search and autocomplete APIs.
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Any top level rest.li resource implementation could extend it and easily add search and autocomplete [ACTION](https://linkedin.github.io/rest.li/user_guide/restli_server#action) methods.
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Refer to [CorpUsers] rest.li resource implementation as an example.
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[mapping]: https://www.elastic.co/guide/en/elasticsearch/reference/5.6/mapping.html
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[tokenizer]: https://www.elastic.co/guide/en/elasticsearch/reference/5.6/analysis-tokenizers.html
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[analyzer]: https://www.elastic.co/guide/en/elasticsearch/reference/5.6/analysis-analyzers.html
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[curl]: https://en.wikipedia.org/wiki/CURL
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[entity]: ../what/entity.md
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[index builder]: ../architecture/metadata-ingestion.md#search-and-graph-index-builders
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[aspect]: ../what/aspect.md
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[mae consumer job]: ../architecture/metadata-ingestion.md#mae-consumer-job
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[mae]: ../what/mxe.md#metadata-audit-event-mae
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[baseindexbuilder]: ../../metadata-builders/src/main/java/com/linkedin/metadata/builders/search/BaseIndexBuilder.java
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[datasetindexbuilder]: ../../metadata-builders/src/main/java/com/linkedin/metadata/builders/search/DatasetIndexBuilder.java
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[index builder registry]: ../../metadata-builders/src/main/java/com/linkedin/metadata/builders/search/RegisteredIndexBuilders.java
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[search index]: ../what/search-index.md
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[search dao]: ../architecture/metadata-serving.md#search-dao
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[essearchdao]: ../../metadata-dao-impl/elasticsearch-dao/src/main/java/com/linkedin/metadata/dao/search/ESSearchDAO.java
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[basesearchdao]: ../../metadata-dao/src/main/java/com/linkedin/metadata/dao/BaseSearchDAO.java
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[basesearchconfig]: ../../metadata-dao-impl/elasticsearch-dao/src/main/java/com/linkedin/metadata/dao/search/BaseSearchConfig.java
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[datasetsearchconfig]: ../../gms/impl/src/main/java/com/linkedin/metadata/configs/DatasetSearchConfig.java
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[basesearchableentityresource]: ../../metadata-restli-resource/src/main/java/com/linkedin/metadata/restli/BaseSearchableEntityResource.java
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[corpusers]: ../../gms/impl/src/main/java/com/linkedin/metadata/resources/identity/CorpUsers.java
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