Netflix/hollow

Health v2 · maintenance only

Adoption not part of the score

1366 stars · 248 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Hollow is a Java library and toolset for disseminating in-memory datasets from a single producer to many consumers for high-performance read-only access. It enables efficient snapshot and delta-based data distribution across services.

Use cases

• distribute reference data from one producer to many microservices
• serve large read-only in-memory datasets with low latency
• incrementally update consumers with dataset deltas
• broadcast lookup data like movie titles or product catalogs to edge services
• replace repeated database queries with in-memory read-only datasets

When to choose

• you have one producer and many consumers of a mostly read-only dataset
• consumers need fast in-memory access without hitting a database
• you need incremental delta updates pushed to many services
• you run on the JVM and want a battle-tested Netflix OSS solution

When to avoid

• your data is write-heavy or requires transactional updates
• consumers are not on the JVM
• your dataset is small enough to fit a simple cache or config file
• you need SQL query capabilities over the data

Facets

library · maturity stable

caching serialization database streaming microservices backend developer-tools jvm cross-platform in-memory-dataset read-only-access data-dissemination producer-consumer netflix-oss data-engineering

Member repositories

For agents

markdown · JSON · MCP: product_card(name="Netflix/hollow")