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https://issues.apache.org/jira/browse/LUCENE-6317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14342236#comment-14342236
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Robert Muir commented on LUCENE-6317:
-------------------------------------
This means bumping formats of .si/.fis/segments_N, but I think its the right
thing to do. Once a segment is read, the structures encoded in these maps
should not be modified by anyone.
Alternatively, we could keep the format the same, but then we leave the bloated
4 byte size, we change behavior in a scary way of an existing method, etc. To
me this is not better, only easier.
> Fix readStringStringMap api
> ---------------------------
>
> Key: LUCENE-6317
> URL: https://issues.apache.org/jira/browse/LUCENE-6317
> Project: Lucene - Core
> Issue Type: Sub-task
> Reporter: Robert Muir
> Fix For: Trunk, 5.1
>
>
> Currently this api is not very efficient, and always returns a mutable map.
> Can we change it to allow immutability? its sad we don't return
> Collections.emptyMap so its the same instance for all empty cases.
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