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Overriding Solr core connection switching

Occasionally, you must override the auto switching behavior in Acquia Search for specific reasons (which can include the following):

  • You are implementing a single search page returning results from several Drupal websites. For this approach, all websites must read and write to a single Solr core and use a module such as the Apache Solr Multisite Search module to power your search pages.
  • Your subscription level isn’t entitled to several Acquia Search Solr cores, and you must write into your single, available core from several environments.
  • You must read/write access from a local- or non-Acquia-hosted website.

Important

Sharing a single Solr core across websites has risks. For more information, see Sharing Solr cores in read/write mode.

To stop Acquia Search from enabling auto switching, use one of the following methods:

Using the Acquia Search Multiple Indexes module

For Drupal 7-based websites, the easiest method to prevent auto-switching is to use the Acquia Search Multiple Indexes module, which enables you to manually configure a different Solr core connection for each Cloud Platform environment. To use this module, complete the following steps:

  1. Download, install, and enable the Acquia Search Multiple Indexes module.
  2. Navigate to the configuration page for this module in your Drupal website’s administration pages.
    • Search API module: Go to Configuration > Search API settings, and then for the Acquia Search server you have configured, click Edit.
    • Apache Solr Search Integration module: Go to Configuration > Apache Solr Search > Settings > Edit.
  3. Select the Automatically switch when an Cloud Platform environment is detected check box.
  4. Click Save.

Using code overrides to set the Acquia Search Solr connection

Acquia Search subscribers can choose to manually configure the connections in the settings.php file by overriding variables. For non-hosted subscribers, setting these variables is the only available method to use multiple Acquia Search Solr cores.

Requirements

Contact Acquia Support to obtain the following required values, which are used with the settings.php provided code overrides:

  • [colony]
  • [core ID]
  • [derived key]

Code override procedure

Note for Site Factory subscribers

Site Factory subscribers must modify the following provided code examples to use $GLOBALS['gardens_site_settings']['env'] instead of $_ENV['AH_SITE_ENVIRONMENT'], as the value of $_ENV['AH_SITE_ENVIRONMENT'] changes during the code deployment process.

Select the code override to use based on your installed Drupal version and the module in use, from the following tabs:

Drupal 8 and greater - Search API Solr
Drupal 7 - Search API Solr
Drupal 7 - Apache Solr Search Integration

Use the acquia_search.settings.connection_override configuration object to define a connection. To override the variables in your settings.php file, add the following code after the Acquia include statement:

// For Drupal 8 using Search API Solr and Acquia Search
if (isset($_ENV['AH_SITE_ENVIRONMENT'])) {
   if ($_ENV['AH_SITE_ENVIRONMENT'] == 'prod') {
        $config['acquia_search.settings']['connection_override'] = [
               'scheme' => 'https',
               'port' => 443,
               'host' => '[colony].acquia-search.com',
               'index_id' => '[core_ID]',
               'derived_key' => '[derived key]',
               ];
         }
   elseif ($_ENV['AH_SITE_ENVIRONMENT'] == 'test') {
         $config['acquia_search.settings']['connection_override'] = [
               'scheme' => 'https',
               'port' => 443,
               'host' => '[colony].acquia-search.com',
               'index_id' => '[core_ID]',
               'derived_key' => '[derived key]',
               ];
         }
   elseif ($_ENV['AH_SITE_ENVIRONMENT'] == 'dev') {
        $config['acquia_search.settings']['connection_override'] = [
               'scheme' => 'https',
               'port' => 443,
               'host' => '[colony].acquia-search.com',
               'index_id' => '[core_ID]',
               'derived_key' => '[derived key]',
               ];
         }
   } else {
      // Local or other non-acquia-hosted Drupal environment
         $config['acquia_search.settings']['connection_override'] = [
             'scheme' => 'https',
             'port' => 443,
             'host' => '[colony].acquia-search.com',
             'index_id' => '[core_ID]',
             'derived_key' => '[derived key]',
             ];
         }

If you are using the Search API module, override using the search_api_acquia_overrides variable. To override the variables in your settings.php file, add the following code after the Acquia include statement (being sure to also replace 'acquia_search' in the code with the machine name of the search_api server):

// For Drupal 7 using Search API Solr and Acquia Search
 if (isset($_ENV['AH_SITE_ENVIRONMENT'])) {
   if ($_ENV['AH_SITE_ENVIRONMENT'] == 'prod') {
         $conf['search_api_acquia_overrides']['acquia_search'] = array(
               'path' => '/solr/[core_ID]',
               'host' => '[colony].acquia-search.com',
               'derived_key' => '[derived_key]',
               );
         }
   elseif ($_ENV['AH_SITE_ENVIRONMENT'] == 'test') {
         $conf['search_api_acquia_overrides']['acquia_search'] = array(
               'path' => '/solr/[core_ID]',
               'host' => '[colony].acquia-search.com',
               'derived_key' => '[derived_key]',
               );
         }
   elseif ($_ENV['AH_SITE_ENVIRONMENT'] == 'dev') {
        $conf['search_api_acquia_overrides']['acquia_search'] = array(
               'path' => '/solr/[core_ID]',
               'host' => '[colony].acquia-search.com',
               'derived_key' => '[derived_key]',
               );
         }
   } else {
      // Local or other non-acquia-hosted Drupal environment
         $conf['search_api_acquia_overrides']['acquia_search'] = array(
              'path' => '/solr/[core_ID]',
              'host' => '[colony].acquia-search.com',
              'derived_key' => '[derived_key]',
              );
         }

When using the Apache Solr Search Integration module, override the apachesolr_environments variable. To override the variables in your settings.php file, add the following code after the Acquia include statement:

// For Drupal 7 using Apache Solr Search Integration and Acquia Search
 if (isset($_ENV['AH_SITE_ENVIRONMENT'])) {
   switch ($_ENV['AH_SITE_ENVIRONMENT']) {
    case 'test':
     $conf['apachesolr_environments']['acquia_search_server_1']['url']
         = 'http://[colony].acquia-search.com:80/solr/[core_ID]';
     $conf['apachesolr_environments']['acquia_search_server_1']['conf']
         ['acquia_search_key'] = '[derived_key]';
     break;
    case 'dev':
     $conf['apachesolr_environments']['acquia_search_server_1']['url'] =
         'http://[colony].acquia-search.com:80/solr/[core_ID]';
     $conf['apachesolr_environments']['acquia_search_server_1']['conf']
         ['acquia_search_key'] = '[derived_key]';
     break;
    }
   }
   else {
    // Set index to read-only in local development environments
     $conf['apachesolr_read_only'] = "1";
   }

Disabling auto-switching

You can use the Drupal variables or configuration objects to override certain Acquia Search module behaviors, described as follows and based on your installed Drupal version:

Important

Making changes to these settings can have data integrity implications for your index.

  • Drupal 8 and greater: Setting acquia_search.settings.disable_auto_switch to TRUE avoids auto-switching, causing the production Solr core to be used in read/write mode. When the variable is not set or is set to FALSE, setting acquia_search.settings.disable_auto_read_only to TRUE avoids the automatic read-only behavior—however, switching to the correct core will still be attempted.
  • Drupal 7: Setting acquia_search_disable_auto_switch to TRUE avoids auto-switching. If you either do not have the Acquia Search Multiple Indexes module configured, or have another code override set, your website will connect to your production core. When the variable is not set or is set to FALSE, setting acquia_search_disable_auto_read_only to TRUE avoids the automatic read-only behavior—however, switching to the correct core will still be attempted.

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