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https://issues.apache.org/jira/browse/LUCENE-4161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13404656#comment-13404656
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Michael McCandless commented on LUCENE-4161:
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bq. The meaning of n is actually a bit complicated.
Thank you for the explanation! That makes sense. I think "iterations" is
good? Or ... maybe we simply leave it as n and then put this nice explanation
in there as a comment?
Naming is the hardest part :)
bq. What additional methods do you think we need?
I'm not sure off-hand yet ... we've been iterating in LUCENE-3892 to find the
least-cost way to decode from the underlying byte based storage from the
IndexInput, but with no real clear fastest solution yet. Logically we are
currently storing an int[] and decoding into int[], so I guess encode/decode
to/from int[]? We should probably try long[] as the backing too ... but, I
think we should explore this (adding int[] based methods) under a new issue?
This patch is already great progress.
> 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
> Attachments: LUCENE-4161.patch
>
>
> 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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