[jira] [Work logged] (BEAM-4796) SpannerIO waits for all input before writing

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-4796?focusedWorklogId=153228&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-153228 ]

ASF GitHub Bot logged work on BEAM-4796:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 10/Oct/18 18:05
            Start Date: 10/Oct/18 18:05
    Worklog Time Spent: 10m 
      Work Description: chamikaramj 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-428672741
 
 
   Can we close this PR given that https://github.com/apache/beam/pull/6478 includes this ?

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Issue Time Tracking
-------------------

    Worklog Id:     (was: 153228)
    Time Spent: 0.5h  (was: 20m)

> 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: Niel Markwick
>            Priority: Major
>             Fix For: 2.9.0
>
>          Time Spent: 0.5h
>  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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