Ask for a better solution for the case

Hi, I hava an application that need mark the retrieved
documents  which have
been read. So the next time I needn't read the marked
documents again.

    I have an idea  that adding a particular field into the
indexed
document. But as lucene have no update method, I have to
delete that
document, and add it again.  I think it seems a little
stupid. Or I can use
a database to satisfy the mark requirement, but how does the
database relate
to lucene index, especially when i want to retrieve document
that I have
read? Maybe there is a better idea.

    Any suggestion will be greatly appreciated.

This one's fairly wild, I'm interested to see what the
gurus think...

You could create a bitset and mark each document retrieved
by the
appropriate bit position (using the Lucene document id).
Persist this bitset
(assuming you need it across sessions). Be careful, I
wouldn't persist it
via the toString(), persist it as a binary entity. It
depends on how many
docs we're talking about I guess....

Anyway, let's say you have accumulated one of these. Create
a filter with
the XOR of the persisted bitset, and pass that filter on to
subsequent
searches...... When the search comes back, set the bits in
your (persisted)
bitset and save it away. Repeat as needed....

I have no idea if this would help in your particular
situation... And, any
time your index changed, any persisted bitsets would be
invalid.

Anyway, it may even work. See the Filters in Lucene for what
filters are all
about.

Erick

hu andy wrote:
> Hi, I hava an application that need mark the retrieved
documents  which have
> been read. So the next time I needn't read the marked
documents again.

You could mark the documents as deleted, then later clear
deletions.  So 
long as you don't close the IndexReader, the deletions will
never be 
flushed to disk.

Doug

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