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https://issues.apache.org/jira/browse/AVRO-682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12924644#action_12924644
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Doug Cutting commented on AVRO-682:
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Also, I think it's fine to expose the "avro." keys.
> Expose the DataFile's metadata entirely
> ---------------------------------------
>
> Key: AVRO-682
> URL: https://issues.apache.org/jira/browse/AVRO-682
> Project: Avro
> Issue Type: Improvement
> Components: java
> Affects Versions: 1.4.1
> Environment: Linux, Java 1.6
> Reporter: Harsh J Chouraria
> Assignee: Harsh J Chouraria
> Priority: Minor
> Fix For: 1.5.0
>
> Attachments: avro.metadata.datafile.r1.diff,
> avro.metadata.datafile.r1.diff, avro.metadata.datafile.r2.diff
>
> Original Estimate: 0.02h
> Remaining Estimate: 0.02h
>
> Right now, the DataFileReader (DataFileStream actually) only allows one to
> query the meta data of a file by issuing a key. A user who does not know what
> metadata may be stored in the file, has no way to find out by getting a
> list/map of all there is. Perhaps we should provide a way for the user to
> retrieve global metadata info to query it back for values.
> Attached a patch (initial) that simply exposes the HashMap that contains the
> metadata after initialization of the data file reader.
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