Thanks Uwe, very useful indeed. Chris
> On 3 Mar 2017, at 18:37, Uwe Schindler <u...@thetaphi.de> wrote: > > Hi Chris, > > as always: "it depends". Generally I would reserve space of approximately the > "original" index size. Most indexes that are continuously updated have an > overhead by 40% for deleted documents. The remaining 60% are indeed used for > merging. Please also keep in mind that if IndexReaders are open while > merging, you may see not all used disk space from the directory listing, > because some files that were merged but are still open in IndexReaders > already disappeared from directory listing (deleted during merge), but still > consume disk space (delete on last close POSIX semantics). > > If you also "forceMerge" your index (you should never ever do this), you may > temporarily need 3 times the index size. > > Uwe > > ----- > Uwe Schindler > Achterdiek 19, D-28357 Bremen > http://www.thetaphi.de > eMail: u...@thetaphi.de > >> -----Original Message----- >> From: Chris Bamford [mailto:ch...@bammers.net] >> Sent: Friday, March 3, 2017 7:24 PM >> To: java-user@lucene.apache.org >> Subject: Index size variation >> >> Hello >> >> I have observed that sometimes my index size temporarily increases by a >> large amount, presumably while it it merges segments. >> >> Is there some documentation on this subject? I am trying to estimate total >> disk space I'll need for a project. >> >> Thanks >> >> Chris >> >> >> >> >> --------------------------------------------------------------------- >> 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 > --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
