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https://issues.apache.org/jira/browse/BEAM-3766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546794#comment-17546794
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Kenneth Knowles commented on BEAM-3766:
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This issue has been migrated to https://github.com/apache/beam/issues/18625
> BigQueryIO - Must specify numFileShards when using FILE_LOADS with unbounded
> PCollection
> ----------------------------------------------------------------------------------------
>
> Key: BEAM-3766
> URL: https://issues.apache.org/jira/browse/BEAM-3766
> Project: Beam
> Issue Type: Bug
> Components: io-java-gcp
> Affects Versions: 2.3.0
> Reporter: Benjamin BENOIST
> Priority: P3
>
> Since Beam v2.2 it's possible to use
> [FILE_LOADS|https://beam.apache.org/documentation/sdks/javadoc/2.2.0/org/apache/beam/sdk/io/gcp/bigquery/BigQueryIO.Write.Method.html#FILE_LOADS].
> The documentation states that we have to specify _withTriggeringFrequency_
> when using it, but doesn't talk about _withNumFileShards_, whereas if we
> don't specify it we get the below exception:
> {code:java}
> Exception in thread "main" java.lang.IllegalArgumentException
> at
> com.google.common.base.Preconditions.checkArgument(Preconditions.java:108)
> at
> org.apache.beam.sdk.io.gcp.bigquery.BatchLoads.expandTriggered(BatchLoads.java:209)
> at
> org.apache.beam.sdk.io.gcp.bigquery.BatchLoads.expand(BatchLoads.java:546)
> at
> org.apache.beam.sdk.io.gcp.bigquery.BatchLoads.expand(BatchLoads.java:79)
> at org.apache.beam.sdk.Pipeline.applyInternal(Pipeline.java:537)
> at org.apache.beam.sdk.Pipeline.applyTransform(Pipeline.java:472)
> at org.apache.beam.sdk.values.PCollection.apply(PCollection.java:286)
> at
> org.apache.beam.sdk.io.gcp.bigquery.BigQueryIO$Write.expandTyped(BigQueryIO.java:1550)
> at
> org.apache.beam.sdk.io.gcp.bigquery.BigQueryIO$Write.expand(BigQueryIO.java:1497)
> at
> org.apache.beam.sdk.io.gcp.bigquery.BigQueryIO$Write.expand(BigQueryIO.java:980)
> at org.apache.beam.sdk.Pipeline.applyInternal(Pipeline.java:537)
> at org.apache.beam.sdk.Pipeline.applyTransform(Pipeline.java:491)
> at org.apache.beam.sdk.values.PCollection.apply(PCollection.java:299)
> at com.travelaudience.data.job.rtbtobigquery.Main$.main(Main.scala:74)
> at com.travelaudience.data.job.rtbtobigquery.Main.main(Main.scala)
> {code}
> Either default _numFileShards_ should be used or it should be precised in the
> documentation that this has to be set.
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