Batch the update

modules/islandora_core_feature/islandora_core_feature.install

@@ -10,9 +10,10 @@ use Drupal\field\Entity\FieldStorageConfig;
 /**
  * Updates Media file size field storage for larger files.
  */
-function islandora_core_feature_update_8001() {
+function islandora_core_feature_update_8001(&$sandbox) {
 
   $entity_type = 'media';
+
   $field_name = 'field_file_size';
 
   $database = \Drupal::database();
@@ -21,8 +22,18 @@ function islandora_core_feature_update_8001() {
     "{$entity_type}_revision__{$field_name}",
   ];
 
+  if (!isset($sandbox['progress'])) {
+    $sandbox['upper_limit'] = 0;
     foreach ($tables as $table) {
 
+      // Record size of the table for future use.
+      $sandbox[$table]['size'] = $database->select($table)
+        ->countQuery()
+        ->execute()
+        ->fetchField();
+      if ($sandbox[$table]['size'] > $sandbox['upper_limit']) {
+        $sandbox['upper_limit'] = $sandbox[$table]['size'];
+      }
       // Move the existing data out of the way.
       $database->schema()->renameTable($table, $table . '_o');
 
@@ -76,6 +87,7 @@ function islandora_core_feature_update_8001() {
         'primary key' => ['entity_id', 'deleted', 'delta', 'langcode'],
         'indexes' => ['bundle' => ['bundle'], 'revision_id' => ['revision_id']],
       ]);
+
     }
 
     // Update field storage configuration.
@@ -88,15 +100,35 @@ function islandora_core_feature_update_8001() {
     // Make sure the new config persists.
     FieldStorageConfig::loadByName($entity_type, $field_name)->save();
 
+    // Track batch reload progress.
+    $sandbox['progress'] = 0;
+  }
+
+  // Arbitrary, hopefully reasonable, batch size per table.
+  $limit = 500;
+
   // Reload the data and clean up.
   foreach ($tables as $table) {
-    $query = $database->select($table . '_o', 'o')->fields('o');
+    if (!isset($sandbox[$table]['done'])) {
+      $query = $database->select($table . '_o', 'o')->fields('o')
+        ->orderBy('o.entity_id', 'ASC')
+        ->orderBy('o.revision_id', 'ASC')
+        ->orderBy('o.delta', 'ASC')
+        ->range($sandbox['progress'], $sandbox['progress'] + $limit);
       $database->insert($table)->from($query)->execute();
       $database->schema()->dropTable($table . '_o');
+      if ($sandbox['progress'] + $limit >= $progress[$table]['size']) {
+        $sandbox[$table]['done'] = TRUE;
+      }
+    }
   }
 
+  $sandbox['progress'] = $sandbox['progress'] + $limit;
+  $sandbox['#finished'] = $sandbox['progress'] >= $sandbox['upper_limit'] ? 1 : $sandbox['progress'] / $sandbox['upper_limit'];
+  if ($sandbox['#finished'] == 1) {
     return t('Length of @entity-type.@field-name updated to an unsigned big int', [
       '@entity-type' => $entity_type,
       '@field-name' => $field_name,
     ]);
+  }
 }