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https://issues.apache.org/jira/browse/LUCENE-4792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13585490#comment-13585490
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Adrien Grand commented on LUCENE-4792:
--------------------------------------
In case someone would like to use this class, I'd add that:
- the encoded sequence does not strictly need to be monotonic: it can encode
any sequence of values but it compresses best when the stream contains
monotonic sub-sequences of 1024 longs at least (for example it would have a
good compression ratio if there are first 10000 increasing values and then 5000
decreasing values),
- it can address up to 2^42 values,
- there are writer/reader equivalents called MonotonicBlockPackedWriter and
MonotonicBlockPackedReader (which can either load values in memory or read from
disk).
> Smaller doc maps
> ----------------
>
> Key: LUCENE-4792
> URL: https://issues.apache.org/jira/browse/LUCENE-4792
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Fix For: 4.2
>
> Attachments: LUCENE-4792.patch
>
>
> MergeState.DocMap could leverage MonotonicAppendingLongBuffer to save memory.
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