org.apache.solr.update.processor
Class DocBasedVersionConstraintsProcessorFactory

java.lang.Object
  org.apache.solr.update.processor.UpdateRequestProcessorFactory
      org.apache.solr.update.processor.DocBasedVersionConstraintsProcessorFactory

All Implemented Interfaces:

UpdateRequestProcessorFactory.RunAlways, NamedListInitializedPlugin, SolrCoreAware

public class DocBasedVersionConstraintsProcessorFactory
extends UpdateRequestProcessorFactory
implements SolrCoreAware, UpdateRequestProcessorFactory.RunAlways

This Factory generates an UpdateProcessor that helps to enforce Version constraints on documents based on per-document version numbers using a configured name of a versionField. It should be configured on the "default" update processor somewhere before the DistributedUpdateProcessorFactory. As an example, see the solrconfig.xml that the tests use: solr/core/src/test-files/solr/collection1/conf/solrconfig-externalversionconstraint.xml

When documents are added through this processor, if a document with the same unique key already exists in the collection, then the value of the versionField in the existing document is not less then the field value in the new document then the new document is rejected with a 409 Version Conflict error.

In addition to the mandatory versionField init param, two additional optional init params affect the behavior of this factory:

• deleteVersionParam - This string parameter controls whether this processor will intercept and inspect Delete By Id commands in addition to adding documents. If specified, then the value will specify the name of a request paramater which becomes mandatory for all Delete By Id commands. This param must then be used to specify the document version associated with the delete. If the version specified using this param is not greater then the value in the versionField for any existing document, then the delete will fail with a 409 Version Conflict error. When using this param, Any Delete By Id command with a high enough document version number to succeed will be internally converted into an Add Document command that replaces the existing document with a new one which is empty except for the Unique Key and versionField to keeping a record of the deleted version so future Add Document commands will fail if their "new" version is not high enough.
• ignoreOldUpdates - This boolean parameter defaults to false, but if set to true causes any update with a document version that is not great enough to be silently ignored (and return a status 200 to the client) instead of generating a 409 Version Conflict error.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.solr.update.processor.UpdateRequestProcessorFactory

UpdateRequestProcessorFactory.RunAlways

Field Summary

static org.slf4j.Logger

log

Constructor Summary

DocBasedVersionConstraintsProcessorFactory()

Method Summary

UpdateRequestProcessor	getInstance(SolrQueryRequest req, SolrQueryResponse rsp, UpdateRequestProcessor next)
void	inform(SolrCore core)
void	init(NamedList args)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

log

public static final org.slf4j.Logger log

Constructor Detail

DocBasedVersionConstraintsProcessorFactory

public DocBasedVersionConstraintsProcessorFactory()

Method Detail

init

public void init(NamedList args)

Specified by:

init in interface NamedListInitializedPlugin

Overrides:

init in class UpdateRequestProcessorFactory

getInstance

public UpdateRequestProcessor getInstance(SolrQueryRequest req,
                                          SolrQueryResponse rsp,
                                          UpdateRequestProcessor next)

Specified by:

getInstance in class UpdateRequestProcessorFactory

inform

public void inform(SolrCore core)

Specified by:

inform in interface SolrCoreAware