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From Upayavira ...@odoko.co.uk>
Subject Re: Search results differs with sorting on pagination.
Date Thu, 10 Sep 2015 07:22:15 GMT
Add fl=id,score,[shard] to your query, and show us the results of two
differing executions.

Perhaps we will be able to see the cause of the difference.

Upayavira

On Thu, Sep 10, 2015, at 05:35 AM, Modassar Ather wrote:
> Thanks Erick. There are no replicas on my cluster and the indexing is one
> time. No updates or additions are done to the index and the segments are
> optimized at the end of indexing.
> So adding a secondary sort criteria is the only solution for such issue
> in
> sort?
> 
> Regards,
> Modassar
> 
> On Wed, Sep 9, 2015 at 8:21 PM, Erick Erickson <erickerickson@gmail.com>
> wrote:
> 
> > When the primary sort criteria is identical for two documents,
> > then the _internal_ Lucene document ID is used to break the
> > tie. The internal ID for two docs can be not only different, but
> > in different _order_ on two separate shards. I'm assuming here
> > that  each of your shards has multiple replicas and/or you're
> > continuing to index to your cluster.
> >
> > The relative internal doc IDs for may change even relative to
> > each other when segments get merged.
> >
> > So yes, if you are sorting by something that can be identical
> > in documents, it's always best to specify a secondary sort
> > criteria. It's not referenced unless there's a tie so it's
> > not that expensive. People often use whatever field
> > is defined for <uniqueKey> since that's _guaranteed_ to
> > never be the same for two docs.
> >
> > Best,
> > Erick
> >
> > On Wed, Sep 9, 2015 at 1:45 AM, Modassar Ather <modather1981@gmail.com>
> > wrote:
> > > Hi,
> > >
> > > Search results are changed every time the following query is hit. Please
> > > note that it is 7 shard cluster of Solr-5.2.1.
> > >
> > > Query: q=network&start=50&rows=50&sort=f_sort
> > asc&group=true&group.field=id
> > >
> > > Following are the fields and their types in my schema.xml.
> > >
> > > <fieldType name="string" class="solr.StrField" sortMissingLast="true"
> > > stored="false" omitNorms="true"/>
> > > <fieldType name="string_dv" class="solr.StrField" sortMissingLast="true"
> > > stored="false" indexed="true" docValues="true"/>
> > >
> > > <field name="id" type="string" stored="true"/>
> > > <dynamicField name="*_sort" type="string_dv"/>
> > >
> > > As per my understanding it seems to be the issue of tie among the
> > document
> > > as when I added a new sort field like below the result never changed
> > across
> > > multiple hits.
> > > q=network&start=50&rows=50&sort=f_sort asc, score
> > > asc&group=true&group.field=id
> > >
> > > Kindly let me know if this is an issue or how this can be fixed.
> > >
> > > Thanks,
> > > Modassar
> >

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