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From Robert Bradshaw <>
Subject Re: Multimap PCollectionViews' values udpated rather than appended
Date Wed, 30 May 2018 17:00:38 GMT
What trigger are you using?

On Wed, May 30, 2018 at 9:48 AM Carlos Alonso <> wrote:

> Hi everyone!!
> Working with multimap based side inputs on the global window I'm
> experiencing something unexpected (at least to me) that I'd like to share
> with you to clarify.
> The way I understand multimaps is that when one emits two values for the
> same key for the same window (obvious thing here as I'm working on the
> Global one), the newly emitted values are appended to the Iterable
> collection that is the value for that particular key on the map.
> Testing it in this job (it is using scio, but side inputs are implemented
> with PCollectionViews):
> The steps to reproduce are:
> 1. Create one table on the target BQ
> 2. Run the job
> 3. Patch the table on BQ (add one field), this should generate a new
> TableSchema for the corresponding TableReference
> 4. An updated value of the fields number appear on the logs, but there is
> only one element within the iterable, as if it had been updated instead of
> appended!!
> Is that the expected behaviour? Is a bug? Am I missing something?
> Thanks!

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