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https://issues.apache.org/jira/browse/LUCENE-652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12683985#action_12683985
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Michael McCandless commented on LUCENE-652:
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If we switch to UnicodeUntil we may want to allow instantiation of
CompressionTools, since UnicodeUtil is optimized for re-use.
And if we do that we have to think about thread safety & concurrency, probably
using CloseableThreadLocal under the hood, and then add a close() method.
> Compressed fields should be "externalized" (from Fields into Document)
> ----------------------------------------------------------------------
>
> Key: LUCENE-652
> URL: https://issues.apache.org/jira/browse/LUCENE-652
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 1.9, 2.0.0, 2.1
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Priority: Minor
> Fix For: 2.9
>
> Attachments: LUCENE-652.patch, LUCENE-652.patch
>
>
> Right now, as of 2.0 release, Lucene supports compressed stored fields.
> However, after discussion on java-dev, the suggestion arose, from Robert
> Engels, that it would be better if this logic were moved into the Document
> level. This way the indexing level just stores opaque binary fields, and
> then Document handles compress/uncompressing as needed.
> This approach would have prevented issues like LUCENE-629 because merging of
> segments would never need to decompress.
> See this thread for the recent discussion:
> http://www.gossamer-threads.com/lists/lucene/java-dev/38836
> When we do this we should also work on related issue LUCENE-648.
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