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From Cheng <zhoucheng2...@gmail.com>
Subject Re: Build RAMDirectory on FSDirectory, and then synchronzing the two
Date Wed, 11 Jan 2012 01:18:01 GMT
I tried  IndexWriterConfig.OpenMode CREATE, and the size is doubled.

The only way that is effective is the writer's deleteAll() methods.

On Mon, Jan 9, 2012 at 5:23 AM, Ian Lea <ian.lea@gmail.com> wrote:

> If you load an existing disk index into a RAMDirectory, make some
> changes in RAM and call addIndexes to add the contents of the
> RAMDirectory to the original disk index, you are likely to end up with
> duplicate data on disk.  Depending of course on what you've done to
> the RAM index.
>
> Sounds you want to call addIndexes using a writer on a new, empty,
> index or overwrite the original. IndexWriterConfig.OpenMode CREATE.
>
>
> --
> Ian.
>
>
> On Mon, Jan 9, 2012 at 4:29 AM, dyzc <1393975679@qq.com> wrote:
> > I'd better provide a snapshot of my code for people to understand my
> issues:
> >
> >
> > File file=new File("c:/index_files");
> > FSDirectory fsDir=new FSDirectory(file);
> > RAMDirectory ramDir=new RAMDirectory(fsDir, new
> IndexWriterConfig(Version.LUCENE_35, new StandardAnalyzer());
> >
> >
> > IndexWriter iw = new IndexWriter(ramDir, iwc);
> >
> >
> > ......DO something here with iw (associated with ramDir).....
> >
> >
> > Now I am trying to synchronize ramDir with fsDir:
> >
> >
> > //close iw prior to synchronization
> > iw.close();
> >
> >
> > // synchronize RAM with FS
> > IndexWriter writer = new IndexWriter(fsDir,     new
> IndexWriterConfig(Version.LUCENE_35, ik));
> > writer.addIndexes(ramDir);
> > writer.close();
> > ramDir.close();
> >
> >
> >
> > Now I end up with duplicate copies of index files in c:/index_files
> >
> >
> > Is there something that I miss here?
> >
> >
> > ------------------ Original ------------------
> > From:  "zhoucheng2008"<zhoucheng2008@gmail.com>;
> > Date:  Mon, Jan 9, 2012 12:04 PM
> > To:  "java-user"<java-user@lucene.apache.org>;
> >
> > Subject:  Build RAMDirectory on FSDirectory, and then synchronzing the
> two
> >
> >
> > Hi,
> >
> > I new a RAMDirectory based upon a FSDirectory. After a few
> modifications, I would like to synchronize the two.
> >
> >
> > Some on the mailing list provided a solution that uses addIndex()
> function.
> >
> >
> > However, the FSDirectory simply combines with the RAMDirectory, and the
> size doubled.
> >
> >
> > How can I do a real synchronization?
> >
> >
> > Thanks
>
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