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https://issues.apache.org/jira/browse/LUCENE-4884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13614350#comment-13614350
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Shai Erera commented on LUCENE-4884:
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bq. I think for this issue we should just add DirectoryTaxonomyWriter.deleteAll
The taxonomy index is a special index with specific structure (e.g. it has the
ROOT document, at doc=0). DTW.deleteAll() makes no sense, even if we try to
implement it properly (by e.g. adding back doc=0). Rather, either open a DTW
with OpenMode.CREATE, or do something like this:
{code}
Directory emptyTaxoDir = new RAMDirectory();
new DirTaxoWriter(emptyTaxoDir).close();
oldTaxoIndex.replaceTaxonomy(emptyTaxoDir);
{code}
I know that DirTaxoWriter.deleteAll() would have been simpler to the app, but I
prefer that we don't expose it.
> deleteAll() does not remove all TaxonomyWriter files
> ----------------------------------------------------
>
> Key: LUCENE-4884
> URL: https://issues.apache.org/jira/browse/LUCENE-4884
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/index
> Affects Versions: 4.2
> Reporter: Rob Audenaerde
> Priority: Minor
>
> When calling deleteAll() on the IndexWriter, the documents are removed from
> the index and from the taxonomy. When investigating what is happing after the
> deleteAll() on the disk, I see that in the index-directory I end up with just
> two files:
> Index-directory:
> * segments.gen
> * segments_2
> Taxonomy directory:
> * segments.gen
> * segments_h
> BUT also a lot of 'older' files, like
> * _1_Lucene41_0.tip
> * _1_Lucene41_0.tim
> etc.
> It seems these files are never deleted. If you index a lot and call deleteAll
> a lot, it will fill up your disk.
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