Well, each access may involve disk seeks (if the pages are not already hot in the OS's IO cache).
So if you do some doc values + some stored fields you're looking at multiple seeks per docID you retrieve. Really you should only do this for a few hits, e.g. one page worth. Mike McCandless http://blog.mikemccandless.com On Wed, Jun 1, 2016 at 3:15 PM, Kumaran Ramasubramanian <kums....@gmail.com> wrote: > Hi All, > > > In javadoc of every docvalue field > < > https://lucene.apache.org/core/4_10_4/core/org/apache/lucene/document/SortedNumericDocValuesField.html > >, > there is line like > > > > If you also need to store the value, you should add a separate > StoredField > > < > https://lucene.apache.org/core/4_10_4/core/org/apache/lucene/document/StoredField.html > > > > instance. > > > > https://lucene.apache.org/core/4_10_4/core/org/apache/lucene/document/SortedNumericDocValuesField.html > > > > > But, we are able to retrieve the value of SortedNumericDocValuesField > using AtomicReader also > > for (AtomicReaderContext context : indexReader.leaves()) > > { > > AtomicReader atomicReader = context.reader(); > > SortedNumericDocValues > > sortedDocValues=DocValues.getSortedNumeric(atomicReader, "Numeric > > _docvalue > > _price"); > > } > > > So what is the difference actually? Is there any performance or time taken > issue in retrieving values of a docvalue field using atomicreader over > StoredField? > > Please clarify me what am i missing? > > Thanks in advance > > > -- > > Kumaran R >
