BQ sink produces sample of successful inserts - #875
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* feature row batch produces sample * lint Co-authored-by: Willem Pienaar <git@willem.co>
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* feature row batch produces sample * lint Co-authored-by: Willem Pienaar <git@willem.co>
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What this PR does / why we need it:
Output of BQ batch insert is now sample from all inserted rows.
Which issue(s) this PR fixes:
Currently BQ's
successful insertsproduces all rows that were in batch. In some use-cases like batch ingestion it could produce up to 30k / sec rows (or ~5 M rows in batch for the default flush frequency (3m)). This output is used in metrics where whole batch (with 5M rows) is grouped into single list, which requires it to fit into memory of one machine. This can lead to memory issues.I suspect that this is overkill since metrics can be easily calculated from sample of inserted data instead of whole batch. This PR changes BQ successful inserts to output only sample of inserted data.
Does this PR introduce a user-facing change?: