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https://issues.apache.org/jira/browse/BEAM-4796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16678297#comment-16678297
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Wout Scheepers edited comment on BEAM-4796 at 11/7/18 2:33 PM:
---------------------------------------------------------------
Hey [~nielm], thanks for implementing the streaming feature!
Unfortunately, I'm still having the following issue when running my streaming
pipeline on dataflow:
My lag starts building up and it appears that the _`Filter Unbatchable
Mutations`_ step keeps on waiting for the schema PCollectionView to be passed.
When I look into the _`Schema View`_ step, the
_`Combine.GloballyAsSingletonView`_ ->` _Combine.globally(Singleton)`_ step has
no output, which I think is the cause for my lag.
Any idea on this? Does it have to do with windowing?
I've been looking into the tests to see how I can make a reproducible, but I
have the feeling the SpannerWriteIT test covers my use case more or less.
Seems like the issue is similar is the following one:
[https://stackoverflow.com/questions/49273528/spannerio-dataflow-2-3-0-stuck-in-createdataflowview]
Thanks in advance,
Wout
was (Author: wouts):
Hey [~nielm], thanks for implementing the streaming feature!
Unfortunately, I'm still having the following issue when running my streaming
pipeline on dataflow:
My lag starts building up and it appears that the `Filter Unbatchable
Mutations` step keeps on waiting for the schema PCollectionView to be passed.
When I look into the `Schema View` step, the `Combine.GloballyAsSingletonView`
->` Combine.globally(Singleton)`step has no output, which I think is the cause
for my lag.
Any idea on this? Does it have to do with windowing?
I've been looking into the tests to see how I can make a reproducible, but I
have the feeling the SpannerWriteIT test covers my use case more or less.
Seems like the issue is similar is the following one:
[https://stackoverflow.com/questions/49273528/spannerio-dataflow-2-3-0-stuck-in-createdataflowview]
Thanks in advance
- Wout
> 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, 2.6.0, 2.7.0, 2.8.0
> Reporter: Niel Markwick
> Assignee: Niel Markwick
> Priority: Major
> Fix For: 2.9.0
>
> Time Spent: 50m
> 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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