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https://issues.apache.org/jira/browse/BEAM-2532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16066925#comment-16066925
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Daniel Halperin commented on BEAM-2532:
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Oh, that is an ugly bug:
- We use a String because we can serialize it, but we can't serialize
TableSchema.
- But then we deserialize on every row (ugh, nice catch!!)
Need a Supplier there I guess, so that we deserialize once in memory. Should be
a straightforward fix, but I doubt I'll get to it in the next day or so :)
> BigQueryIO source should avoid expensive JSON schema parsing for every record
> -----------------------------------------------------------------------------
>
> Key: BEAM-2532
> URL: https://issues.apache.org/jira/browse/BEAM-2532
> Project: Beam
> Issue Type: Improvement
> Components: sdk-java-gcp
> Affects Versions: 2.0.0
> Reporter: Marian Dvorsky
> Assignee: Stephen Sisk
> Priority: Minor
>
> BigQueryIO source converts the schema from JSON for every input row, here:
> https://github.com/apache/beam/blob/master/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/BigQuerySourceBase.java#L159
> This is the performance bottleneck in a simple pipeline with BigQueryIO
> source.
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