It will return true if the provided docID was deleted, by term or
query or docID (due to exception, privately) prior to when you asked
IndexWriter to give you a "realtime" IndexReader.
Mike
Cam Bazz wrote:
ok. but then under what circumstances isDeleted() will return true?
Best.
On Mon, Sep 15, 2008 at 10:57 PM, Michael McCandless
<[EMAIL PROTECTED]> wrote:
Until we can get realtime search integrated into Lucene (which I'm
gradually
trying to working on) I think the answer is no -- for now you have
to keep
your own record of which docIDs you've deleted.
Because IndexWriter allows deletes by query and term (and also by
docID,
privately, when a document hits a non-aborting exception) it's
tricky to
give real-time isDeleted for a docID.
My current thinking on how to do this (once we add realtime search)
is when
you ask IndexWriter for a new IndexReader, which searches the full
index in
the Directory plus all adds/deletes buffered in IndexWriter's RAM
buffer, it
must "materialize" all such buffered deletes down to docID. Those
deletes
that are against existing segments in the index will be flushed at
that
point to those segments; the deletes that apply only to buffered
docs will
be held in RAM and used by the RAMIndexSearcher that searches
IndexWriter's
buffer.
Mike
Cam Bazz wrote:
So, apart from the searcher, is there anyway to access the deletion
marks in an indexWriter.
I have a live cache - and I was keeping two caches, ones for new
adds,
other for deletes.
I am trying to get rid of deleted cache, and ask the index if a
fetched document is marked deleted.
Best.
-C.B.
On Mon, Sep 15, 2008 at 10:20 PM, Michael McCandless
<[EMAIL PROTECTED]> wrote:
You'll have to open a new IndexReader after the delete is
committed.
An IndexReader (or IndexSearcher) only searches the point-in-time
snapshot
of the index as of when it was opened.
Mike
Cam Bazz wrote:
Hello,
Here is what I am trying to do:
dir = FSDirectory.getDirectory("/test");
writer = new IndexWriter(dir, analyzer, true, new
IndexWriter.MaxFieldLength(2));
writer.setMaxBufferedDocs(IndexWriter.DISABLE_AUTO_FLUSH);
Document da = new Document();
da.add(new Field("word", "a", Field.Store.YES,
Field.Index.NOT_ANALYZED_NO_NORMS));
Document db = new Document();
db.add(new Field("word", "b", Field.Store.YES,
Field.Index.NOT_ANALYZED_NO_NORMS));
writer.addDocument(da);
writer.addDocument(db);
writer.commit();
searcher = new IndexSearcher(dir);
writer.deleteDocuments(new Term("word", "a"));
writer.commit();
TopDocCollector collector = new TopDocCollector(10);
searcher.search(new TermQuery(new Term("word","a")),
collector);
ScoreDoc[] hits = collector.topDocs().scoreDocs;
for (int i = 0; i < hits.length; i++) {
int docId = hits[i].doc;
Document d = searcher.doc(docId);
System.out.println(writer.hasDeletions());
System.out.println(searcher.getIndexReader().isDeleted(docId));
System.out.println(d.get("word"));
}
searcher.close();
writer.close();
dir.close();
well I am trying to check if an document has been deleted without
refreshing the searcher. maybe i should access indexreader in a
different way?
the isDeleted() always returns false. that is the problem right
now.
Best.
-C.B.
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