[jira] Commented: (HADOOP-732) SequenceFile's header should allow to store metadata in the form of key/value pairs

["Hadoop QA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12466945 ] 

Hadoop QA commented on HADOOP-732:
----------------------------------

+1, because http://issues.apache.org/jira/secure/attachment/12349495/seqFileMetadata.patch applied and successfully tested against trunk revision r499156.

> SequenceFile's header should allow to store metadata in the form of key/value pairs
> -----------------------------------------------------------------------------------
>
>                 Key: HADOOP-732
>                 URL: https://issues.apache.org/jira/browse/HADOOP-732
>             Project: Hadoop
>          Issue Type: New Feature
>          Components: io
>            Reporter: Runping Qi
>         Assigned To: Runping Qi
>         Attachments: seqFileMetadata.patch
>
>
> The sequence file currently stores a fixed list of metadata attributes, such as key/value class names, 
> compression method, etc.  To make sequence file more self descriptable, it should allow to store a list of key/value pairs.  One particular attribute of interest is to indicate whether the key/value classes are actually hadoop record classes, 
> if so, store the DDls for the records. This way, we may create tools to extract DDl from a sequence file and 
> then generate necessary classes. It also make it possible to provide an interpretive version of Hadoop record. 
> This way, even in the situation where Hadoop or the application does not have the necessary classes, 
> a sequence file of Hadoop records can be read and deserialized "interpretively".

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