Usage Of Real Time Get Handler Of Solr

[Furkan KAMACI]

Hi;

There is a real time get handler at Solr:

  <!-- realtime get handler, guaranteed to return the latest stored fields of
       any document, without the need to commit or open a new searcher.  The
       current implementation relies on the updateLog feature being enabled. -->
  <requestHandler name="/get" class="solr.RealTimeGetHandler">
     <lst name="defaults">
       <str name="omitHeader">true</str>
       <str name="wt">json</str>
       <str name="indent">true</str>
     </lst>
  </requestHandler>

    <updateLog>
      <str name="dir">${solr.ulog.dir:}</str>
    </updateLog


Whenever I check that URL:

:8983/solr/get?q=*:*

the response is always:


{
  "doc":null}

What is real time get handler for? And why it is a feauture of NoSQL databases?