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https://issues.apache.org/jira/browse/SOLR-9918?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Koji Sekiguchi reassigned SOLR-9918:
------------------------------------
Assignee: Koji Sekiguchi
> An UpdateRequestProcessor to skip duplicate inserts and ignore updates to
> missing docs
> --------------------------------------------------------------------------------------
>
> Key: SOLR-9918
> URL: https://issues.apache.org/jira/browse/SOLR-9918
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: update
> Reporter: Tim Owen
> Assignee: Koji Sekiguchi
> Attachments: SOLR-9918.patch, SOLR-9918.patch
>
>
> This is an UpdateRequestProcessor and Factory that we have been using in
> production, to handle 2 common cases that were awkward to achieve using the
> existing update pipeline and current processor classes:
> * When inserting document(s), if some already exist then quietly skip the new
> document inserts - do not churn the index by replacing the existing documents
> and do not throw a noisy exception that breaks the batch of inserts. By
> analogy with SQL, {{insert if not exists}}. In our use-case, multiple
> application instances can (rarely) process the same input so it's easier for
> us to de-dupe these at Solr insert time than to funnel them into a global
> ordered queue first.
> * When applying AtomicUpdate documents, if a document being updated does not
> exist, quietly do nothing - do not create a new partially-populated document
> and do not throw a noisy exception about missing required fields. By analogy
> with SQL, {{update where id = ..}}. Our use-case relies on this because we
> apply updates optimistically and have best-effort knowledge about what
> documents will exist, so it's easiest to skip the updates (in the same way a
> Database would).
> I would have kept this in our own package hierarchy but it relies on some
> package-scoped methods, and seems like it could be useful to others if they
> choose to configure it. Some bits of the code were borrowed from
> {{DocBasedVersionConstraintsProcessorFactory}}.
> Attached patch has unit tests to confirm the behaviour.
> This class can be used by configuring solrconfig.xml like so..
> {noformat}
> <updateRequestProcessorChain name="skipexisting">
> <processor class="solr.LogUpdateProcessorFactory" />
> <processor
> class="org.apache.solr.update.processor.SkipExistingDocumentsProcessorFactory">
> <bool name="skipInsertIfExists">true</bool>
> <bool name="skipUpdateIfMissing">false</bool> <!-- We will override
> this per-request -->
> </processor>
> <processor class="solr.DistributedUpdateProcessorFactory" />
> <processor class="solr.RunUpdateProcessorFactory" />
> </updateRequestProcessorChain>
> {noformat}
> and initParams defaults of
> {noformat}
> <str name="update.chain">skipexisting</str>
> {noformat}
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