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https://issues.apache.org/jira/browse/ARROW-998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16004922#comment-16004922
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Wes McKinney commented on ARROW-998:
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Looking at the implementation 
https://github.com/apache/arrow/blob/master/cpp/src/arrow/ipc/writer.cc#L757 I 
don't think we need the magic to be 64-byte aligned. I'll open a JIRA

> [Doc] File format documents incorrect schema location
> -----------------------------------------------------
>
>                 Key: ARROW-998
>                 URL: https://issues.apache.org/jira/browse/ARROW-998
>             Project: Apache Arrow
>          Issue Type: Bug
>            Reporter: Brian Hulette
>
> The documentation for the file format makes it look like the schema is at the 
> beginning of the file, since it "contains" the streaming format 
> (https://github.com/apache/arrow/blob/master/format/IPC.md#file-format), but 
> in reality the schema is in the footer 
> (https://github.com/apache/arrow/blob/master/format/File.fbs#L29)



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