Issue #3421640 by Wim Leers, dan612: Adjust hardcoded memory limit in...

Issue #3421640 by Wim Leers, dan612: Adjust hardcoded memory limit in getClusteredMigrationPlugins()

src/Clusterer/MigrationClusterer.php

@@ -13,6 +13,7 @@ use Drupal\acquia_migrate\Clusterer\Heuristics\HeuristicWithSingleClusterInterfa
 use Drupal\acquia_migrate\Clusterer\Heuristics\IndependentHeuristicInterface;
 use Drupal\acquia_migrate\Clusterer\Heuristics\LiftingHeuristicInterface;
 use Drupal\Component\Assertion\Inspector;
+use Drupal\Component\Utility\Bytes;
 use Drupal\Core\DependencyInjection\ClassResolverInterface;
 use Drupal\migrate\Exception\RequirementsException;
 use Drupal\migrate\MigrateBuildDependencyInterface;
@@ -292,8 +293,12 @@ final class MigrationClusterer {
     // Computing all clusters is very resource-intensive. For complex source
     // sites, the number of dependencies between migration plugins to analyze to
     // compute the appropriate clusters can be very high. Increase the memory
-    // limit for the remainder of this request.
-    ini_set('memory_limit', '512M');
+    // limit for the remainder of this request if not above 512 MB.
+    $minimum_memory_limit_mb = 512;
+    $current_memory_limit = Bytes::toNumber(ini_get('memory_limit'));
+    if ($current_memory_limit < ($minimum_memory_limit_mb * 1024 * 1024)) {
+      ini_set('memory_limit', $minimum_memory_limit_mb . 'M');
+    }
 
     $all_migration_plugins = $this->getAvailableMigrationPlugins();