Add deleteAllDocuments() method to IndexWriter
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Key: LUCENE-1705
URL: https://issues.apache.org/jira/browse/LUCENE-1705
Project: Lucene - Java
Issue Type: Wish
Components: Index
Affects Versions: 2.4
Reporter: Tim Smith
Ideally, there would be a deleteAllDocuments() or clear() method on the
IndexWriter
This method should have the same performance and characteristics as:
* currentWriter.close()
* currentWriter = new IndexWriter(..., create=true,...)
This would greatly optimize a delete all documents case. Using
deleteDocuments(new MatchAllDocsQuery()) could be expensive given a large
existing index.
IndexWriter.deleteAllDocuments() should have the same semantics as a commit(),
as far as index visibility goes (new IndexReader opening would get the empty
index)
I see this was previously asked for in LUCENE-932, however it would be nice to
finally see this added such that the IndexWriter would not need to be closed to
perform the "clear" as this seems to be the general recommendation for working
with an IndexWriter now
deleteAllDocuments() method should:
* abort any background merges (they are pointless once a deleteAll has been
received)
* write new segments file referencing no segments
This method would remove one of the final reasons i would ever need to close an
IndexWriter and reopen a new one
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