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https://issues.apache.org/jira/browse/BEAM-4796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16555308#comment-16555308
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Wout Scheepers commented on BEAM-4796:
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For me this also gives problems in streaming mode. Did a SO writeup:
[https://stackoverflow.com/questions/51480770/streaming-mutationgroups-into-spanner.]
> 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
> Priority: Major
>
> 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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