Also I notice this issue is still open: https://issues.apache.org/jira/browse/SOLR-10816 Does that mean we still need to have stored=true for uniqueKey?
On Tue, Nov 6, 2018 at 2:14 PM Wei <weiwan...@gmail.com> wrote: > I see there is also a docValuesFormat option, what's the default for this > setting? Performance wise is it good to set docValuesFormat="Memory" ? > > Best, > Wei > > > On Tue, Nov 6, 2018 at 11:55 AM Erick Erickson <erickerick...@gmail.com> > wrote: > >> Yes, "the most efficient possible" is associated with that JIRA, so only >> in 7x. >> >> "Does this still hold if whole index is loaded into memory?" >> The decompression part yes, the disk seek part no. And it's also >> sensitive to whether the documentCache already has the document. >> >> I'd also make uniqueKey ant the _version_ fields docValues. >> >> Best, >> Erick >> On Tue, Nov 6, 2018 at 10:44 AM Wei <weiwan...@gmail.com> wrote: >> > >> > Thanks Yasufumi and Erick. >> > >> > ---. 2. "it depends". Solr will try to do the most efficient thing >> > possible. If _all_ the fields are docValues, it will return the stored >> > values from the docValues structure. >> > >> > I find this jira: https://issues.apache.org/jira/browse/SOLR-8344 >> Does >> > this mean "Solr will try to do the most efficient thing possible" only >> > working for 7.x? Is the behavior available for 6.6? >> > >> > -- This prevents a disk seek and decompress cycle. >> > >> > Does this still hold if whole index is loaded into memory? Also for the >> > benefit of performance improvement, does the uniqueKey field need to be >> > always docValues? Since it is used in the first phase of distributed >> > search. >> > >> > Thanks, >> > Wei >> > >> > >> > >> > On Tue, Nov 6, 2018 at 8:30 AM Erick Erickson <erickerick...@gmail.com> >> > wrote: >> > >> > > 2. "it depends". Solr will try to do the most efficient thing >> > > possible. If _all_ the fields are docValues, it will return the stored >> > > values from the docValues structure. This prevents a disk seek and >> > > decompress cycle. >> > > >> > > However, if even one field is docValues=false Solr will by default >> > > return the stored values. For the multiValued case, you can explicitly >> > > tell Solr to return the docValues field. >> > > >> > > Best, >> > > Erick >> > > On Tue, Nov 6, 2018 at 1:46 AM Yasufumi Mizoguchi >> > > <yasufumi0...@gmail.com> wrote: >> > > > >> > > > Hi, >> > > > >> > > > > 1. For schema version 1.6, useDocValuesAsStored=true is default, >> so >> > > there >> > > > > is no need to explicitly set it in schema.xml? >> > > > >> > > > Yes. >> > > > >> > > > > 2. With useDocValuesAsStored=true and the following definition, >> will >> > > Solr >> > > > > retrieve id from docValues instead of stored field? >> > > > >> > > > No. >> > > > AFAIK, if you define both docValues="true" and stored="true" in your >> > > > schema, >> > > > Solr tries to retrieve stored value. >> > > > (Except using streaming expressions or /export handler etc... >> > > > See: >> > > > >> > > >> https://lucene.apache.org/solr/guide/6_6/docvalues.html#DocValues-EnablingDocValues >> > > > ) >> > > > >> > > > Thanks, >> > > > Yasufumi >> > > > >> > > > >> > > > 2018年11月6日(火) 9:54 Wei <weiwan...@gmail.com>: >> > > > >> > > > > Hi, >> > > > > >> > > > > I have a few questions about using the useDocValuesAsStored >> option to >> > > > > retrieve field from docValues: >> > > > > >> > > > > 1. For schema version 1.6, useDocValuesAsStored=true is default, >> so >> > > there >> > > > > is no need to explicitly set it in schema.xml? >> > > > > >> > > > > 2. With useDocValuesAsStored=true and the following definition, >> will >> > > Solr >> > > > > retrieve id from docValues instead of stored field? if fl= id, >> title, >> > > > > score, both id and title are single value field: >> > > > > >> > > > > <field name="id" type="string" indexed="true" stored="true" >> > > > > docValues="true" required="true"/> >> > > > > >> > > > > <field name="title" type="string" indexed="true" stored="true" >> > > > > docValues="true" required="true"/> >> > > > > >> > > > > Do I need to have all fields stored="false" docValues="true" to >> make >> > > solr >> > > > > retrieve from docValues only? I am using Solr 6.6. >> > > > > >> > > > > Thanks, >> > > > > Wei >> > > > > >> > > >> >
