Hi Xiaolong, A Map of key-value pairs can be supplied to IndexWriter#setCommitData(Map<String,String>) and will be persisted when committing changes (setting the commit data counts as a change). It can be retrieved with IndexWriter#getCommitData() later.
This may serve as good storage for metadata; as an example, Elasticsearch stores attributes related to its transaction log there (UUID and generation identifier). Regards, András On Tue, Nov 22, 2016 at 5:40 PM, Xiaolong Zheng <zhengxiaol...@gmail.com> wrote: > Thanks, StoredField seems still down to the per-document level, which means > for every document they will contains this search field. > > What I really would like is a global level storage to hold this single > value. Maybe this is impossible. > > Sincerely, > > --Xiaolong > > > On Tue, Nov 22, 2016 at 5:13 AM, Michael McCandless < > luc...@mikemccandless.com> wrote: > >> Lucene won't merge foreign files for you, and in general it's >> dangerous to put such files into Lucene's index directory because if >> they look like codec files Lucene may delete them. >> >> Can you just add a StoredField to each document to hold your information? >> >> Mike McCandless >> >> http://blog.mikemccandless.com >> >> >> On Mon, Nov 21, 2016 at 11:38 PM, Xiaolong Zheng >> <zhengxiaol...@gmail.com> wrote: >> > Hello, >> > >> > I am trying to adding some meta data into the search data base. Instead >> of >> > adding a new search filed or adding a phony document, I am looking at the >> > method org.apache.lucene.store.Directory#createOutpu, which is create >> new >> > file in the search directory. >> > >> > >> > I am wondering does indexwriter can also merge this non-index file while >> it >> > merging multiple search index? >> > >> > And if I am stepping back a little bit, what's is the best way to add >> meta >> > data into the search database. >> > >> > For example, I would like to add a indicator which is showing the >> different >> > kind of stemmer is being used while it created. >> > >> > >> > >> > >> > >> > Thanks, >> > >> > --Xiaolong >> -- András Péteri --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
