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https://issues.apache.org/jira/browse/BEAM-8145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16952302#comment-16952302
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Kenneth Knowles commented on BEAM-8145:
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[~Primevenn] [~chamikara] is this fixed?
> Pubsub message size limit not taking size increase from base64 encoding into
> account
> ------------------------------------------------------------------------------------
>
> Key: BEAM-8145
> URL: https://issues.apache.org/jira/browse/BEAM-8145
> Project: Beam
> Issue Type: Bug
> Components: io-java-gcp
> Reporter: Michael Yzvenn Wolanski
> Priority: Major
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> In the PubSubIO, the default max batch size is set to `10 * 1024 * 1024`
> bytes. This however does not take into account the size increase of base64
> encoding the messages after the flush. Base64 encodes each set of three bytes
> into four bytes.
> Therefore the 'true' size limit placed on the unencoded batch should be
> x = ((10 * 1024 * 1024) / 4) * 3 = 7864320 bytes
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