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  7. 25. Distributed Search Index
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25. Distributed Search Index

Context and Problem Statement

Search is currently implemented with blevesearch, which internally uses bbolt. bbolt writes to a local file, which prevents scaling out the service.

The initial implementation used a single blevesearch index for all spaces. While this makes querying all spaces easy because the results do not need to be aggregated from multiple indexes, the single node becomes a bottleneck when answering search queries. Furthermore, indexing is also part of the search service and has to share the resources.

Decision Drivers

  • Indexing should be decoupled from the search service
  • The search service should be able to scale horizontally
  • The solution needs to be embeddable in the single binary

Considered Options

Decision Outcome

Chosen option: ???

Positive Consequences:

  • TODO

Negative Consequences:

  • TODO

Pros and Cons of the Options

one index per space

Instead of using a single index (current implementation) or a distributed search index like elasticsearch the search service should aggregate queries from dedicated indexes per space. The api to a space index provider should be able to take multiple space ids in the request, similar to how a storage provider can handle multiple spaces. When treating spaces and the corresponding search index to belong together we can also treat them as a single unit for backup and restore. In federated deployments we can send the search queries to all search providers / spaces that the user has access to.

How a search provider is implemented then depends on the requirements. For a single node deployment bleve might be fine, for a kubernetes deployment a dedicated service might be the better fit.

elasticsearch

dgraph

manticore

meilisearch

Links

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