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https://issues.apache.org/jira/browse/LUCENE-6504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14561043#comment-14561043
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Robert Muir commented on LUCENE-6504:
-------------------------------------
{quote}
There are some unrelated changes in ByteBufferIndexInput: You removed the
offset=0 implementation. Did you find out that this optimization for offset=0
brings no additional performance?
{quote}
Its not unrelated, i did extensive benchmarking. That optimization is a trap,
allowing too many low level implementations (3) once the index gets large.
> implement norms with random access API
> --------------------------------------
>
> Key: LUCENE-6504
> URL: https://issues.apache.org/jira/browse/LUCENE-6504
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Robert Muir
> Attachments: LUCENE-6504.patch
>
>
> We added this api in LUCENE-5729 but we never explored implementing norms
> with it. These are generally the largest consumer of heap memory and often a
> real hassle for users.
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