A custom MergePolicy can also select single-segment merges. Mike McCandless
http://blog.mikemccandless.com On Fri, Feb 21, 2014 at 9:53 AM, Uwe Schindler <u...@thetaphi.de> wrote: > Hi, > > There are two possibilities: > > (1) Use IndexWriter.addIndexes(IndexReader) and copy the old index to a new > one. This will merge everything into one segment. > > (2) Use IndexUpgrader and override the method that determines if an index > segment is outdated. If you only return true for the segment that needs to be > merged to itself, and later start the upgrade process, it will exactly do > what you want. > > This is more or less a copypaste of the example in: > http://lucene.apache.org/core/4_6_0/core/org/apache/lucene/index/UpgradeIndexMergePolicy.html > You just have to (anonymously) subclass UpgradeIndexMergePolicy and return > true from "protected boolean shouldUpgradeSegment(SegmentCommitInfo si)" only > for the segment to be merged. By default this returns true for segments that > are written by older Lucene versions. > > Uwe > > ----- > Uwe Schindler > H.-H.-Meier-Allee 63, D-28213 Bremen > http://www.thetaphi.de > eMail: u...@thetaphi.de > > >> -----Original Message----- >> From: Ravikumar Govindarajan [mailto:ravikumar.govindara...@gmail.com] >> Sent: Friday, February 21, 2014 3:24 PM >> To: java-user@lucene.apache.org >> Subject: Single segment merge in lucene possible? >> >> Hi, >> >> Is it possible to merge a single segment all by itself, may be just >> accounting >> for deletes alone? >> >> This is needed so as to solve certain data-locality issues we face in a >> custom >> implementation of Directory API. >> >> -- >> Ravi > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-user-h...@lucene.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
