Content Staging with Apache Solr

We all love test and staging environments but it becomes a problem when you have Solr integrated in your project and you have a test solr, a staging solr and a production solr core. To re-index a site is not a big problem, but what if you want to go live and switch indexes immediately?

Drupal.org has wrestled with this problem. So I wanted to show you how they do it.

Create three Solr cores - mysite_core1 (will be used for tests) - mysite_core2 (will be used for staging initially) - mysite_core3 (will be used for production initially)

Make sure your staging site indexes as if it was the production site. There are a number of tricks you can apply.

Site hash

Make sure both site hashes are exactly the same, otherwise it won't correctly find the indexed content

  1. variable_set('apachesolr_site_hash', 'mysite_custom_hash');

Base URL

When Solr indexes content, it will use absolute urls. To trick solr you could set the base url to reflect production.

  1. # $base_url = 'http://www.example.com';  // NO trailing slash!

Alter the documents that are being sent

You could also not do the base_url approach and hardcode the fields you want to change. Using the hook_apachesolr_index_documents_alter() you could any of the staging urls to reflect production urls. csevb10 created something similar but used a different hook. Below is more or less the same code, using the documents_alter hook.

  1. function hook_apachesolr_index_documents_alter($documents, $entity, $entity_type, $env_id) {
  2.   $start_url = variable_get('apachesolr_url_switch_start_url', 'http://staging');
  3.   $end_url = variable_get('apachesolr_url_switch_end_url', 'http://production');
  4.  
  5.   $elems = array(
  6.     'site',
  7.     'url',
  8.     'content',
  9.     'teaser',
  10.   );
  11.   foreach ($documents as $id => $document) {
  12.     foreach ($elems as $elem) {
  13.       $documents[$id]->{$elem} = str_replace($start_url, $end_url, $document->{$elem});
  14.     }
  15. }

Create an update function and let it set the correct index position

  1. function my_module_update_7001() {
  2.   // I am assuming your environment is called "core"
  3.   // mark all content to be reindexed so our table would be in sync with the transfered nodes.
  4.   apachesolr_index_node_solr_reindex('core');
  5.   // fetch your current apachesolr_index_last from staging
  6.   $staging_index_last = array();
  7.   variable_set('apachesolr_index_last',$staging_index_last);
  8.   // fetch your current apachesolr_index_updated from staging
  9.   $staging_updated = array();
  10.   variable_set('apachesolr_index_updated', $staging_updated);
  11. }

Switching the core

Once you move to production, make sure you switch the cores. So mysite_core2 becomes production and mysite_core3 becomes staging. You could also copy the complete data dir from solr to your thrid core but that might not be automatic enough for some you.

Enjoy

Nick
Wednesday, November 7, 2012 - 12:37

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