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https://issues.apache.org/jira/browse/BEAM-4796?focusedWorklogId=144875&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-144875
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ASF GitHub Bot logged work on BEAM-4796:
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Author: ASF GitHub Bot
Created on: 17/Sep/18 15:25
Start Date: 17/Sep/18 15:25
Worklog Time Spent: 10m
Work Description: nielm commented on issue #6409: [BEAM-4796] SpannerIO:
Add option to wait for Schema to be ready.
URL: https://github.com/apache/beam/pull/6409#issuecomment-422061192
Note that I could not work out how to test a pipeline that uses
Wait.on(signal), so no tests were added for this PR.
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Issue Time Tracking
-------------------
Worklog Id: (was: 144875)
Time Spent: 20m (was: 10m)
> 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
> Time Spent: 20m
> Remaining Estimate: 0h
>
> 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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