Apache Solr Reference Guide Covering Apache Solr 6.0

updateRequestProcessorChain
true
id
false
name,features,cat
solr.processor.Lookup3Signature
In the above example, a new update processor chain named "dedupe" is created with
SignatureUpdateProcessorFactory, LogUpdateProcessorFactory and RunUpdateProcessorFactory in the chain.
The SignatureUpdateProcessorFactory is further configured with different parameters such as "signatureField",
"overwriteDupes" etc. This chain is an example of how Solr can be configured to perform de-duplication of
documents by calculating a signature using the value of name, features, cat fields which is then used as the "id"
field. As you may have noticed, this chain does not specify the DistributedUpdateProcessorFactory - because
this processor is critical for Solr to operate properly, Solr will automatically insert DistributedUpdateProcessorFac
tory in this chain that does not include it just prior to the RunUpdateProcessorFactory.
RunUpdateProcessorFactory
Do not forget to add RunUpdateProcessorFactory at the end of any chains you define in solrconfig.xml
otherwise update requests processed by that chain will not actually affect the indexed data.
Configuring individual processors as top-level plugins
Update request processors can also be configured independent of a chain in solrconfig.xml.
updateProcessor
true
id
false
name,features,cat
solr.processor.Lookup3Signature
In this case, an instance of SignatureUpdateProcessorFactory is configured with the name "signature" and a
RemoveBlankFieldUpdateProcessorFactory is defined with the name "remove_blanks". Once the above has
been specified in solrconfig.xml, we can be refer to them in update request processor chains in solrconfig.xml as
follows:
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