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Date: Fri, 19 Jun 2009 13:18:07 -0700 (PDT)
From: "Tim Smith (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Created: (LUCENE-1705) Add deleteAllDocuments() method to
 IndexWriter
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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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