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https://issues.apache.org/jira/browse/AVRO-183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12880948#action_12880948
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Doug Cutting commented on AVRO-183:
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I think this feature should assume that binary encoding is used.

Perhaps this can be implemented with an OutputStream that counts bytes rather 
than writes anything?

> add DatumWriter#sizeOf method that computes the number of bytes an object 
> will be serialized as
> -----------------------------------------------------------------------------------------------
>
>                 Key: AVRO-183
>                 URL: https://issues.apache.org/jira/browse/AVRO-183
>             Project: Avro
>          Issue Type: New Feature
>          Components: java
>            Reporter: Doug Cutting
>            Assignee: John Yu
>
> Sometimes it is useful to know how large an object will be when serialized 
> before it is in fact serialized.

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