Robert Bradshaw created BEAM-4565:
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Summary: Hot key fanout should not distribute keys to all shards.
Key: BEAM-4565
URL: https://issues.apache.org/jira/browse/BEAM-4565
Project: Beam
Issue Type: Task
Components: sdk-java-core, sdk-py-core
Affects Versions: 2.4.0, 2.3.0, 2.2.0, 2.1.0, 2.0.0, 2.5.0
Reporter: Robert Bradshaw
Assignee: Kenneth Knowles
The goal is to reduce the number of value sent to a single post-GBK worker. If
combiner lifting happens, each bundle will sends a single value per sub-key,
causing an N-fold blowup in shuffle data and N reducers with the same amount of
data to consume as the single reducer in the non-fanout case.
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