robertwb opened a new pull request, #29587:
URL: https://github.com/apache/beam/pull/29587
The ability to perform point lookups for multi-map side inputs is great for
maps that are too large to fit into memory, but can be very inefficient in
requiring an entire state request per key for small maps.
This change adds an optional protocol to request an entire map as a stream
of key-values in one (possibly paginated) API call, and uses this to bulk
pre-fetch an initial set of values from the map before falling back to point
lookups.
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