Shai Erera created LUCENE-4564:
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Summary: Add taxonomy index upgrade utility
Key: LUCENE-4564
URL: https://issues.apache.org/jira/browse/LUCENE-4564
Project: Lucene - Core
Issue Type: New Feature
Components: modules/facet
Reporter: Shai Erera
Assignee: Shai Erera
Priority: Blocker
Fix For: 5.0
Currently there's no way for an app to upgrade a taxonomy index to the newest
index format. The problem is, that unlike search indexes which may merge
segments often, the taxonomy index is not likely to do many merges. At some
point, most taxonomies become fixed (i.e. new categories are not/rarely added),
and therefore it could be that some old segments will never get merged.
When we'll release Lucene 5.0, support for 3x indexes will be removed, and so
taxonomies that were created w/ 3x won't be read anymore.
While one can use IndexUpgrader (I think) to upgrade the taxonomy index, it may
not be so trivial for users to realize that, as it may not be so evident from
DirTaxoWriter/Reader API that there's a regular Lucene index behind the scenes.
A tool, like TaxonomyUpgraderTool, even if simple and using IndexUpgrader, may
make it more convenient for user to upgrade their taxonomy index.
Opening as a placeholder for 5.0. Also marking as blocker, so we don't forget
about it before the release.
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