[jira] [Created] (SOLR-12934) Make Update Request Processors CDCR aware (i.e. skip process if CDCR forwarded update)

["Amrit Sarkar (JIRA)" <ji...@apache.org>]

Amrit Sarkar created SOLR-12934:
-----------------------------------

             Summary: Make Update Request Processors CDCR aware (i.e. skip process if CDCR forwarded update)
                 Key: SOLR-12934
                 URL: https://issues.apache.org/jira/browse/SOLR-12934
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
          Components: CDCR, UpdateRequestProcessors
            Reporter: Amrit Sarkar


While setting up CDCR in {{solrconfig.xml}} at {{target}} cluster, we need to make default update processor chain with {{CdcrUpdateProcessorFactory}} like:
{code}
<updateRequestProcessorChain name="cdcr-processor-chain">
  <processor class="solr.CdcrUpdateProcessorFactory"/>
  <processor class="solr.RunUpdateProcessorFactory"/>
</updateRequestProcessorChain>
{code}
{code}
<requestHandler name="/update" class="solr.UpdateRequestHandler">
  <lst name="defaults">
    <str name="update.chain">cdcr-processor-chain</str>
  </lst>
</requestHandler>
{code}
The motivation having a default update processor chain with no other but {{CdcrUpdateProcessorFactory}} is to NOT MODIFY already processed and transformed data at source. And it works perfectly.

In {{Bidirectional}} scenario, we need to set this default chain at both clusters, source & target. And while sending documents from application side; we need to EXPLICITLY SET {{update.chain}} [default chain|https://lucene.apache.org/solr/guide/6_6/update-request-processors.html#UpdateRequestProcessors-CustomUpdateRequestProcessorChain] with each batch at the primary/source cluster. This introduces an extra activity/effort at the application end.

It would be great if we can make Update Request Processors CDCR aware; i.e. skip and don't process the doc batches which are CDCR forwarded ones and treat the others as default. 





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