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https://issues.apache.org/jira/browse/LUCENE-1618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12703388#action_12703388
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Michael McCandless commented on LUCENE-1618:
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{quote}
> it might be cleaner to make a Directory impl that dispatches certain files to
> a RAMDir and others to an FSDir
Good idea. I'll try that method first. If this one works out, then the API will
be public?
{quote}
Which API would be public?
If this (call it "FileSwitchDirectory" for now ;) ) works then we would not add
any API to IndexWriter (ie it's either or)? But FileSwitchDirectory would be
public & "expert".
One downside to this approach is it's brittle -- whenever we change file
extensions you'd have to "know" to fix this Directory. Or maybe we make the
Directory specialized to only storing the doc stores in the FSDir, then
whenever we change file formats we would fix this directory? But in the
future, with custom codecs, things could be named whatever... hmmm. Lacking
clarity.
> Allow setting the IndexWriter docstore to be a different directory
> ------------------------------------------------------------------
>
> Key: LUCENE-1618
> URL: https://issues.apache.org/jira/browse/LUCENE-1618
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 2.4.1
> Reporter: Jason Rutherglen
> Priority: Minor
> Fix For: 2.9
>
> Original Estimate: 336h
> Remaining Estimate: 336h
>
> Add an IndexWriter.setDocStoreDirectory method that allows doc
> stores to be placed in a different directory than the IW default
> dir.
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