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https://issues.apache.org/jira/browse/BEAM-991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16057102#comment-16057102
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Mingwei Samuel commented on BEAM-991:
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Also want to chime in that I'm hitting this issue. Found it via Joshua's SO
question
> DatastoreIO Write should flush early for large batches
> ------------------------------------------------------
>
> Key: BEAM-991
> URL: https://issues.apache.org/jira/browse/BEAM-991
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-gcp
> Reporter: Vikas Kedigehalli
> Assignee: Vikas Kedigehalli
>
> If entities are large (avg size > 20KB) then the a single batched write (500
> entities) would exceed the Datastore size limit of a single request (10MB)
> from https://cloud.google.com/datastore/docs/concepts/limits.
> First reported in:
> http://stackoverflow.com/questions/40156400/why-does-dataflow-erratically-fail-in-datastore-access
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