[jira] [Created] (SOLR-15290) Better Docs/Tests/Warnings/Defaults for SignatureUpdateProcessorFactory in SolrCloud

["Chris M. Hostetter (Jira)" <ji...@apache.org>]

Chris M. Hostetter created SOLR-15290:
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             Summary: Better Docs/Tests/Warnings/Defaults for SignatureUpdateProcessorFactory in SolrCloud
                 Key: SOLR-15290
                 URL: https://issues.apache.org/jira/browse/SOLR-15290
             Project: Solr
          Issue Type: Task
      Security Level: Public (Default Security Level. Issues are Public)
            Reporter: Chris M. Hostetter


I was recently helping someone who had very weird symptoms of replicas getting out of sync, that turned out to be because of using SignatureUpdateProcessorFactory to "de-duplicate" documents that had different unique keys, but identical computed "signatures".

Although they had customized the {{fields}} configuration of SignatureUpdateProcessorFactory, most of the (bad) behavior came from the defaults:
{code:java}
      overwriteDupes = params.getBool("overwriteDupes", true);
      signatureField = params.get("signatureField", "signatureField");
{code}
...in spite of the fact that this combination does not – and has never – worked with SolrCloud: SOLR-3473

I'm opening this issue to serve as a Parent for a few Sub-Tasks. Some of which I hope to takle imminently, and some of which are just ideas for the future.



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