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https://issues.apache.org/jira/browse/LUCENE-4575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13506530#comment-13506530
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Yonik Seeley commented on LUCENE-4575:
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bq. I don't think though that it's trivial to support. Currently the user can
pass any Map, but IndexReader returns in practice a HashMap
(DataInput.readStringStringMap initializes a HashMap).
If a user cared about order, then they would pass a LinkedHashMap. Then the
only thing that would need to change is DataInput.readStringStringMap:
s/HashMap/LinkedHashMap.
bq. it's not really related to how the map is set.
It is... if you make a copy of the map and we want to preserve order, it's new
LinkedHashMap instead of HashMap.
It's a minor enough point I don't think it does deserve it's own issue. I
don't personally care about preserving order - but I did think it was worth at
least bringing up.
> Allow IndexWriter to commit, even just commitData
> -------------------------------------------------
>
> Key: LUCENE-4575
> URL: https://issues.apache.org/jira/browse/LUCENE-4575
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/index
> Reporter: Shai Erera
> Priority: Minor
> Attachments: LUCENE-4575.patch
>
>
> Spinoff from here
> http://lucene.472066.n3.nabble.com/commit-with-only-commitData-td4022155.html.
> In some cases, it is valuable to be able to commit changes to the index, even
> if the changes are just commitData. Such data is sometimes used by
> applications to register in the index some global application
> information/state.
> The proposal is:
> * Add a setCommitData() API and separate it from commit() and prepareCommit()
> (simplify their API)
> * When that API is called, flip on the dirty/changes bit, so that this gets
> committed even if no other changes were made to the index.
> I will work on a patch a post.
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