| <!DOCTYPE html> |
| <html lang="en"> |
| <!-- |
| Licensed to the Apache Software Foundation (ASF) under one or more |
| contributor license agreements. See the NOTICE file distributed with |
| this work for additional information regarding copyright ownership. |
| The ASF licenses this file to You under the Apache License, Version 2.0 |
| (the "License"); you may not use this file except in compliance with |
| the License. You may obtain a copy of the License at |
| http://www.apache.org/licenses/LICENSE-2.0 |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| --> |
| <head> |
| <meta charset="utf-8" /> |
| <title>GetSolr</title> |
| <link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css" /> |
| </head> |
| |
| <body> |
| <h2>Usage Example</h2> |
| <p> |
| This processor pulls data from Solr collections. For its usage, Solr collections |
| have to fulfil two requirements: |
| </p> |
| <ul> |
| <li>The documents must include a date field containing the time when they were |
| indexed. Such kind of field can be easily added to documents at indexing time |
| e. g. using Solrs' UpdateRequestProcessor created by |
| 'TimestampUpdateProcessorFactory'.</li> |
| <li>The configuration of the Solr index (e. g. schema.xml or managed-schema) must |
| define a uniqueKey field.</li> |
| </ul> |
| <p> |
| Backwards compatibility to configurations of the GetSolr processor used within releases |
| of NiFi prior to 1.5 can be realized as follows: |
| </p> |
| <ul> |
| <li>Find the file conf/.getSolr* within the prior NiFi installation.</li> |
| <li>Open the file and copy the timestamp defined for 'LastEndDate'.</li> |
| <li>Insert the timestamp into the field 'Initial Date Filter'.</li> |
| </ul> |
| <p> |
| Annotation: The value of property 'Solr Query' actually is not added to parameter 'q' |
| but to parameter 'fq' for two reasons: |
| </p> |
| <ul> |
| <li>Improving performance by leveraging Solrs' filter cache.</li> |
| <li>Scoring is not required for the purpose of this processor as the sorting |
| is fixed to 'DateField asc, IdField asc'</li> |
| </ul> |
| </body> |
| </html> |
