ahmedabu98 opened a new pull request, #38836:
URL: https://github.com/apache/beam/pull/38836
Adds a DoFn that scans each incoming snapshot and plans batches of changelog
scan tasks. Each batch is routed to the appropriate downstream path depending
on its contents and size. There's a lot of details in the java doc, but to
summarize:
- **Unidirectional** changes, such as append-only inserts or delete-only
work, are routed to a fast path that can be read and emitted directly.
- **Small bidirectional** groups are routed to a local in-memory resolver.
- **Large bidirectional** groups are routed to the distributed resolution
path where rows are grouped by primary key then passed to a resolver
We perform a few optimizations to limit the amount of data we need to
resolve:
- non-overwrite snapshots can bypass update resolution
- if partition specs are derived from PK fields, we narrow down to
per-partition analysis
- non-overlapping opposing tasks can bypass update resolution
Note: "update resolution" is logic that compares inserts and deletes to
check if an update has occurred.
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