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https://issues.apache.org/jira/browse/BEAM-1330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17488395#comment-17488395
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Kenneth Knowles commented on BEAM-1330:
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Looks like the PR was merged. Is this issue resolved now? (just checking back)
> DatastoreIO Writes should flush early when duplicate keys arrive.
> -----------------------------------------------------------------
>
> Key: BEAM-1330
> URL: https://issues.apache.org/jira/browse/BEAM-1330
> Project: Beam
> Issue Type: Improvement
> Components: io-java-gcp
> Reporter: Vikas Kedigehalli
> Assignee: Fernando Morales
> Priority: P3
> Time Spent: 2h 50m
> Remaining Estimate: 0h
>
> DatastoreIO writes batches upto 500 entities (rpc limit for Cloud Datastore),
> before flushing them out. The writes are non-transactional and thus do not
> support duplicate keys in the writes. This can be problem, especially when
> using a non global windowing, where multiple windows for the same key end up
> in the same batch, and prevents the writes from succeeding.
> https://github.com/apache/beam/blob/master/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/datastore/DatastoreV1.java
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