Niel Markwick created BEAM-4796:
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Summary: SpannerIO waits for all input before writing
Key: BEAM-4796
URL: https://issues.apache.org/jira/browse/BEAM-4796
Project: Beam
Issue Type: Bug
Components: io-java-gcp
Affects Versions: 2.5.0
Reporter: Niel Markwick
Assignee: Chamikara Jayalath
SpannerIO.Write waits for all input in the window to arrive before getting the
schema:
[https://github.com/apache/beam/blame/release-2.5.0/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/spanner/SpannerIO.java#L841]
In streaming mode, this is not an issue, but in batch mode, this causes the
pipeline to stall until all input is read, which could be a significant amount
of time (and temp data).
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