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https://issues.apache.org/jira/browse/BEAM-3569?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Oscar Korz resolved BEAM-3569.
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Resolution: Fixed
> SpannerIO.write throws on delete mutations
> ------------------------------------------
>
> Key: BEAM-3569
> URL: https://issues.apache.org/jira/browse/BEAM-3569
> Project: Beam
> Issue Type: Bug
> Components: io-java-gcp
> Affects Versions: 2.2.0
> Reporter: Oscar Korz
> Assignee: Kenneth Knowles
> Priority: Major
> Fix For: 2.3.0
>
> Attachments: beam-spanner-io-delete.tar.gz
>
>
> It is currently impossible to delete a Spanner row in Beam with SpannerIO.
> The exception is generated by trying to guess the size of a delete mutation
> which cannot contain any values (deletes are simply by key).
> The root exception stack trace:
> {code:java}
> Caused by: java.lang.IllegalStateException: values() cannot be called for a
> DELETE mutation
> at com.google.common.base.Preconditions.checkState(Preconditions.java:456)
> at com.google.cloud.spanner.Mutation.getValues(Mutation.java:233)
> at
> org.apache.beam.sdk.io.gcp.spanner.MutationSizeEstimator.sizeOf(MutationSizeEstimator.java:33)
> at
> org.apache.beam.sdk.io.gcp.spanner.MutationSizeEstimator.sizeOf(MutationSizeEstimator.java:51)
> {code}
> I believe this can be fixed by special casing MutationSizeEstimator.sizeOf to
> either 0 or 1 for Mutations with getOperation() = Op.DELETE.
> The workaround is to avoid using SpannerIO and use Spanner client API
> directly in a custom DoFn, but this forces users to either reimplement all
> the intelligent batching that SpannerIO does or suffer poor performance.
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