Hi It works directly off the mmapped files. It is not fully loaded into heap, only some small control structures are allocated on heap. During sorting the TopDocsCollector uses the memory mapped structures to uncompress and lookup the sort values.
Uwe ----- Uwe Schindler Achterdiek 19, D-28357 Bremen http://www.thetaphi.de eMail: u...@thetaphi.de > -----Original Message----- > From: wangqinghuan [mailto:1095193...@qq.com] > Sent: Thursday, June 15, 2017 4:36 AM > To: general@lucene.apache.org > Subject: Would docvalues be loaded into jvm? > > hi > I know that data is written into disk with the style of column-store if I > enable doc-values for certain field. > But I don't understand why sorting with docvalues doesn't increase the load > of jvm. whatever sorting algorithm , data would be loaded into jvm to sort. > This should be a high load for jvm when I sort all index , but no change > for jvm in fact. How does lucene sort with docvalues ? Can sort algorithm > work directly based on the file (Mmap) ? > > > > -- > View this message in context: http://lucene.472066.n3.nabble.com/Would- > docvalues-be-loaded-into-jvm-tp4340644.html > Sent from the Lucene - General mailing list archive at Nabble.com.
