Theoretically, perhaps. And it's quite true that stored data for fields marked stored=true are just passed through verbatim and compressed on disk while the data associated with indexed=true fields go through an analysis chain and are stored in a much different format. However these different data are simply stored in files with different suffixes in a segment. So you might have _0.fdx, _0.fdt, _0.tim, _0.tvx etc. that together form a single segment.
This is done on a per-segment basis. So certain segment files, namely the *.fdt and *.fdx file will contain the stored data while other extensions have the indexed data, see: "File naming" here for a somewhat out of date format, but close enough for this discussion: https://lucene.apache.org/core/4_0_0/core/org/apache/lucene/codecs/lucene40/package-summary.html. And there's no option to store the *.fdt and *.fdx files independently from the rest of the segment files. This statement: "I mean documents which are to be indexed" really doesn't make sense. You send these things called Solr documents to be indexed, but they are just a set of fields with values handled as their definitions indicate (i.e. respecting stored=true|false, indexed=true false, docValues=true|false. The Solr document sent by SolrJ is simply thrown away after processing into segment files. If you're sending semi-structured docs (say Word, PDF etc) to be indexed through Tika they are simply transformed into a Solr doc (set of field/value pairs) and the original document is thrown away as well. There's no option to store the original semi-structured doc either. Best, Erick On Mon, Nov 14, 2016 at 12:35 PM, Prateek Jain J <prateek.j.j...@ericsson.com> wrote: > > By data, I mean documents which are to be indexed. Some fields can be > stored="true" but that doesn’t matter. > > For example: App1 creates an object (AppObj) to be indexed and sends it to > SOLR via solrj. Some of the attributes of this object can be declared to be > used for storage. > > Now, my understanding is data and indexes generated on data are two separate > things. In my particular example, all fields have stored="true" but only > selected fields have indexed="true". My expectation is, indexes are stored > separately from data because indexes can be generated by different > techniques/algorithms but data/documents remain unchanged. Please correct me > if my understanding is not correct. > > > Regards, > Prateek Jain > > -----Original Message----- > From: Erick Erickson [mailto:erickerick...@gmail.com] > Sent: 14 November 2016 07:05 PM > To: solr-user <solr-user@lucene.apache.org> > Subject: Re: index and data directories > > The question is pretty opaque. What do you mean by "data" as opposed to > "indexes"? Are you talking about where Lucene puts stored="true" > fields? If not, what do you mean by "data"? > > If you are talking about where Lucene puts the stored="true" bits the no, > there's no way to segregate that our from the other files that make up a > segment. > > Best, > Erick > > On Mon, Nov 14, 2016 at 7:58 AM, Prateek Jain J <prateek.j.j...@ericsson.com> > wrote: >> >> Hi Alex, >> >> I am unable to get it correctly. Is it possible to store indexes and data >> separately? >> >> >> Regards, >> Prateek Jain >> >> -----Original Message----- >> From: Alexandre Rafalovitch [mailto:arafa...@gmail.com] >> Sent: 14 November 2016 03:53 PM >> To: solr-user <solr-user@lucene.apache.org> >> Subject: Re: index and data directories >> >> solr.xml also has a bunch of properties under the core tag: >> >> <cores adminPath="/admin/cores"> >> <core name="core0" instanceDir="core0"> >> <property name="dataDir" value="/data/core0"/></core> >> <core name="core1" instanceDir="core1"/> >> </cores> >> >> You can get the Reference Guide for your specific version here: >> http://archive.apache.org/dist/lucene/solr/ref-guide/ >> >> Regards, >> Alex. >> ---- >> Solr Example reading group is starting November 2016, join us at >> http://j.mp/SolrERG Newsletter and resources for Solr beginners and >> intermediates: >> http://www.solr-start.com/ >> >> >> On 15 November 2016 at 02:37, Prateek Jain J <prateek.j.j...@ericsson.com> >> wrote: >>> >>> Hi All, >>> >>> We are using solr 4.8.1 and would like to know if it is possible to >>> store data and indexes in separate directories? I know following tag >>> exist in solrconfig.xml file >>> >>> <!-- Data Directory Used to specify an alternate directory to hold all index >>> data other than the default ./data under >>> the Solr home. If replication is >>> in use, this should match the replication >>> configuration. --> >>> <dataDir>C:/del-it/solr/cm_events_nbi/data</dataDir> >>> >>> >>> >>> Regards, >>> Prateek Jain
