Well, if it's a docValues field you can do update in place at the Lucene level for certain types of simple values (numerics, strings, but not text types) see: https://issues.apache.org/jira/browse/LUCENE-5189
In essence the reason it's a delete/re-add is that the structure of the postings list and the promise that Lucene segments are write-once makes it fiendishly complex and error-prone. So yes, it's extra work. But do you have any evidence that your update rate is such that it's prohibitive? Best, Erick On Fri, Jul 10, 2015 at 2:45 AM, Gimantha Bandara <giman...@wso2.com> wrote: > ah.. I misread the thread,I thought you were using two APIs to acheive the > same done by updateDocument. Yes it is an overhead and harder for user to > keep track of the fields that he doesn't need to update. Already there is a > Jira opened for this[1]. > > [1] https://issues.apache.org/jira/browse/LUCENE-4258 > > On Fri, Jul 10, 2015 at 1:58 PM, chalitha udara Perera < > chalithaud...@gmail.com> wrote: > >> Hi Gimatha, >> >> Yes. It is possible to use IndexWriter updateDocument() to update document. >> But with that method what happens under the hood is it deletes matching >> documents and re-index new document. I need to update only a single field. >> Re-indexing a new document with updated field + other fields seems to be >> big overhead. My question is, why lucene does that and currently is there a >> way we can avoid this ? >> >> Thanks, >> Chalitha >> >> On Fri, Jul 10, 2015 at 1:46 PM, Gimantha Bandara <giman...@wso2.com> >> wrote: >> >> > Hi Chalitha, >> > >> > You can simply use indexWriter.updateDocument to update the existing >> index >> > documents >> > >> > On Fri, Jul 10, 2015 at 11:38 AM, chalitha udara Perera < >> > chalithaud...@gmail.com> wrote: >> > >> > > Hi All, >> > > >> > > I have a requirement for updating lucene index (add single field for >> > > existing docs and modify value of another field). These documents >> contain >> > > many other fields that do not need any modifications. But as I >> understand >> > > luence provides delete/add mechanism for even single field value >> > updates. I >> > > would really appreciate if someone can explain me why lucene use these >> > > delete/add for updates as it feels like a real bottleneck. >> > > >> > > Is there any way to do single fields updates without using delete/add ? >> > > >> > > Thanks, >> > > Chalitha >> > > >> > > -- >> > > J.M Chalitha Udara Perera >> > > >> > > *Department of Computer Science and Engineering,* >> > > *University of Moratuwa,* >> > > *Sri Lanka* >> > > >> > >> > >> > >> > -- >> > Gimantha Bandara >> > Software Engineer >> > WSO2. Inc : http://wso2.com >> > Mobile : +94714961919 >> > >> >> >> >> -- >> J.M Chalitha Udara Perera >> >> *Department of Computer Science and Engineering,* >> *University of Moratuwa,* >> *Sri Lanka* >> > > > > -- > Gimantha Bandara > Software Engineer > WSO2. Inc : http://wso2.com > Mobile : +94714961919 --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
