For index updates to be visible (searchable), some kind of commit must reopen a searcher to a new point-in-time view of the index.
The realtime get feature allows retrieval (by unique-key) of the latest version of any documents without the associated cost of reopening a searcher. This is primarily useful when using Solr as a NoSQL data store and not just a search index.
Real Time Get relies on the update log feature, which is enabled by default and can be configured in solrconfig.xml:
<updateLog>
<str name="dir">${solr.ulog.dir:}</str>
</updateLog>Real Time Get requests can be performed using the /get handler which exists implicitly in Solr - see Implicit RequestHandlers - it’s equivalent to the following configuration:
<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>For example, if you started Solr using the bin/solr -e techproducts example command, you could then index a new document (with out committing it) like so:
curl 'http://localhost:8983/solr/techproducts/update/json?commitWithin=10000000' \
-H 'Content-type:application/json' -d '[{"id":"mydoc","name":"realtime-get test!"}]'If you do a normal search, this document should not be found yet:
http://localhost:8983/solr/techproducts/query?q=id:mydoc
...
"response":
{"numFound":0,"start":0,"docs":[]}However if you use the Real Time Get handler exposed at /get, you can still retrieve that document:
http://localhost:8983/solr/techproducts/get?id=mydoc
...
{"doc":{"id":"mydoc","name":"realtime-get test!", "_version_":1487137811571146752}}You can also specify multiple documents at once via the ids parameter and a comma separated list of ids, or by using multiple id parameters. If you specify multiple ids, or use the ids parameter, the response will mimic a normal query response to make it easier for existing clients to parse.
For example:
http://localhost:8983/solr/techproducts/get?ids=mydoc,IW-02
http://localhost:8983/solr/techproducts/get?id=mydoc&id=IW-02
...
{"response":
{"numFound":2,"start":0,"docs":
[ { "id":"mydoc",
"name":"realtime-get test!",
"_version_":1487137811571146752},
{
"id":"IW-02",
"name":"iPod & iPod Mini USB 2.0 Cable",
...
]
}
}Real Time Get requests can also be combined with filter queries, specified with an fq parameter, just like search requests:
http://localhost:8983/solr/techproducts/get?id=mydoc&id=IW-02&fq=name:realtime-get
...
{"response":
{"numFound":1,"start":0,"docs":
[ { "id":"mydoc",
"name":"realtime-get test!",
"_version_":1487137811571146752}
]
}
}|
Do NOT disable the realtime get handler at Similarly, a replica recovery will also always fetch the complete index from the leader because a partial sync will not be possible in the absence of this handler. |