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https://issues.apache.org/jira/browse/LUCENE-6199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14291749#comment-14291749
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Robert Muir commented on LUCENE-6199:
-------------------------------------
{quote}
I fixed Lucene50FISReader to share a single attributes map if it
notices that multiple fields have exactly the same attributes (the map
is read-only). It would be nice if we could fix this higher up,
e.g. fix PerFieldXXXFormat to not store its attributes if the format
is "the default" somehow.
{quote}
I don't think we should be doing this. This is letting the abuse case make our
code (for field metadata, which is fucking important stuff!) more complicated.
-1: let them buy more ram.
> Reduce per-field heap usage for indexed fields
> ----------------------------------------------
>
> Key: LUCENE-6199
> URL: https://issues.apache.org/jira/browse/LUCENE-6199
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: Trunk, 5.1
>
> Attachments: LUCENE-6199.patch
>
>
> Lucene uses a non-trivial baseline bytes of heap for each indexed
> field, and I know it's abusive for an app to create 100K indexed
> fields but I still think we can and should make some effort to reduce
> heap usage per unique field?
> E.g. in block tree we store 3 BytesRefs per field, when 3 byte[]s
> would do...
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