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Posted to common-dev@hadoop.apache.org by "Owen O'Malley (JIRA)" <ji...@apache.org> on 2006/11/21 23:17:05 UTC
[jira] Commented: (HADOOP-732) SequenceFile's header should allow
to store metadata in the form of key/value pairs
[ http://issues.apache.org/jira/browse/HADOOP-732?page=comments#action_12451794 ]
Owen O'Malley commented on HADOOP-732:
--------------------------------------
Would the meta-data key/value pairs be required to be strings? That would simplify everything. It isn't clear what the right API for this would be.
> SequenceFile's header should allow to store metadata in the form of key/value pairs
> -----------------------------------------------------------------------------------
>
> Key: HADOOP-732
> URL: http://issues.apache.org/jira/browse/HADOOP-732
> Project: Hadoop
> Issue Type: New Feature
> Reporter: Runping Qi
>
> 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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