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 > > > > > > > > >
