[jira] Commented: (AVRO-682) Expose the DataFile's metadata entirely

["Doug Cutting (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AVRO-682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12924643#action_12924643 ] 

Doug Cutting commented on AVRO-682:
-----------------------------------

This looks great.  One addition:  can we make the list umodifiable?  After the values are all added, we can call
{code} 
  metaKeyList = Collections.unmodifiableList(metaKeyList);
{code}
Also, we should add some tests that call this new method.


> 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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