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From "Varun Thacker (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SOLR-12816) Don't allow RunUpdateProcessorFactory to be set before DistributedUpdateProcessorFactory
Date Fri, 28 Sep 2018 18:35:00 GMT
Varun Thacker created SOLR-12816:
------------------------------------

             Summary: Don't allow RunUpdateProcessorFactory to be set before DistributedUpdateProcessorFactory
                 Key: SOLR-12816
                 URL: https://issues.apache.org/jira/browse/SOLR-12816
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
            Reporter: Varun Thacker


Here's the problem that came up with a customer call today morning - "My documents are not
getting replicated to the replicas and the doc counts don't match up"

It was a 3 node cluster. The collection was 1 shard X 3 replicas .

This is a scary situation to be in. We started down the patch of debugging replica types ,
auto-commits , checking if the {{_version_}}  field and {{id}} fields were defined correctly
etc.

 

The problem was the user had defined a custom update processor chain and had RunUpdateProcessorFactory
defined before DistributedUpdateProcessorFactory
{code:java}
<updateRequestProcessorChain ...
  ....
  <processor class="solr.LogUpdateProcessorFactory"/>
  <processor class="solr.RunUpdateProcessorFactory"/>
  <processor class="solr.DistributedUpdateProcessorFactory"/>
</updateRequestProcessorChain>{code}
 

With this update chain, whichever node you index the document against will be the only one
indexing the document. It will never forward to the other nodes. So you can  index against
a node hosting a replica and the leader will never get this document.

Is there any use-case where having RunUpdateProcessor before DistributedUpdateProcessor is
needed?

 

Perhaps we could borrow the idea from TRA or make these two update processors default and
remove them from the default configs?
{code:java}
When processing an update for a TRA, Solr initializes its UpdateRequestProcessor chain as
usual, but when DistributedUpdateProcessor (DUP) initializes, it detects that the update targets
a TRA and injects TimeRoutedUpdateProcessor (TRUP) in front of itself.{code}
 



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