Hi You can use SortingMergePolicy and SortingAtomicReader to achieve that. You can read more about index sorting here: http://shaierera.blogspot.com/2013/04/index-sorting-with-lucene.html
Shai On Wed, Oct 23, 2013 at 8:13 PM, Arvind Kalyan <bas...@gmail.com> wrote: > Hi there, I'm looking for pointers, suggestions on how to approach this in > Lucene 4.5. > > Say I am creating an index using a sequence of addDocument() calls and end > up with segments that each contain documents in a specified ordering. It is > guaranteed that there won't be updates/deletes/reads etc happening on the > index -- this is an offline index building task for a read-only index. > > I create the index in the above mentioned fashion > using LogByteSizeMergePolicy and finally do a forceMerge(1) to get a single > segment in the ordering I want. > > Now my requirement is that I need to be able to merge this single segment > with another such segment (say from yesterday's index) and guarantee some > ordering -- say I have a comparator which looks at some field values in the > 2 given docs and defines the ordering. > > Index 1 with segment X: > (a,1) > (b,2) > (e,10) > > Index 2 (say from yesterday) with some segment Y: > (c,4) > (d,6) > > Essentially we have 2 ordered segments, and I'm looking to 'merge' them > (literally) using the value of some field, without having to re-sort them > which would be too time & resource consuming. > > Output Index, with some segment Z: > (a,1) > (b,2) > (c,4) > (d,6) > (e,10) > > Is this already possible? If not, any tips on how I can approach > implementing this requirement? > > Thanks, > > -- > Arvind Kalyan >
