Adrien Grand created LUCENE-4161:
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Summary: Make PackedInts usable by codecs
Key: LUCENE-4161
URL: https://issues.apache.org/jira/browse/LUCENE-4161
Project: Lucene - Java
Issue Type: Improvement
Components: core/store
Reporter: Adrien Grand
Assignee: Adrien Grand
Priority: Minor
Some codecs might be interested in using
PackedInts.{Writer,Reader,ReaderIterator} to read and write fixed-size values
efficiently.
The problem is that the serialization format is self contained, and always
writes the name of the codec, its version, its number of bits per value and its
format. For example, if you want to use packed ints to store your postings
list, this is a lot of overhead (at least ~60 bytes per term, in case you only
use one Writer per term, more otherwise).
Users should be able to externalize the storage of metadata to save space. For
example, to use PackedInts to store a postings list, one should be able to
store the codec name, its version and the number of bits per doc in the header
of the terms+postings list instead of having to write it once (or more!) per
term.
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