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https://issues.apache.org/jira/browse/SOLR-12816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16642763#comment-16642763
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David Smiley commented on SOLR-12816:
-------------------------------------
See UpdateRequestProcessorChain line 155 (in init()) which detects that the
chain doesn't have DURP and automatically adds it immediately before the Run
URP.
It would be nice if perhaps the chain could be defined by phases in which you
add URPs to an URP phase. In this way, built-ins could be handled more cleanly
without having to mess with the constructors of URPs like I did for TRAs which
felt like a hack.
> 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
> Priority: Major
>
> 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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