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https://issues.apache.org/jira/browse/LUCENE-6199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14342204#comment-14342204
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Robert Muir commented on LUCENE-6199:
-------------------------------------
I dont think the readStringStringMap is safe.
The problem is that the empty map is immutable and this breaks the expectations
of callers of this method (bug).
> 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-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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