SequenceFile's header should allow to store metadata in the form of key/value
pairs
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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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