#111127 rollback by chx, slightly extended: roll back node_load cache, it...

#111127 rollback by chx, slightly extended: roll back node_load cache, it needs more thought and discussion, so postponed until at least Drupal 7

modules/book/book.module

@@ -564,8 +564,6 @@ function book_remove_form_submit($form, &$form_state) {
     // Only allowed when this is not a book (top-level page).
     menu_link_delete($node->book['mlid']);
     db_query('DELETE FROM {book} WHERE nid = %d', $node->nid);
-    // Clear the node load cache.
-    cache_clear_all('*', 'cache_node', TRUE);
     drupal_set_message(t('The post has been removed from the book.'));
   }
   $form_state['redirect'] = 'node/'. $node->nid;
@@ -611,8 +609,6 @@ function _book_update_outline(&$node) {
         // Update the bid for this page and all children.
         book_update_bid($node->book);
       }
-      // Clear the node load cache.
-      cache_clear_all('*', 'cache_node', TRUE);
     }
     return TRUE;
   }

modules/comment/comment.module

@@ -2035,7 +2035,6 @@ function _comment_update_node_statistics($nid) {
     $node = db_fetch_object(db_query("SELECT uid, created FROM {node} WHERE nid = %d", $nid));
     db_query("UPDATE {node_comment_statistics} SET comment_count = 0, last_comment_timestamp = %d, last_comment_name = '', last_comment_uid = %d WHERE nid = %d", $node->created, $node->uid, $nid);
   }
-  cache_clear_all($nid, 'cache_node');
 }
 
 /**

modules/node/node.module

@@ -444,7 +444,6 @@ function node_type_delete($type) {
  */
 function node_type_update_nodes($old_type, $type) {
   db_query("UPDATE {node} SET type = '%s' WHERE type = '%s'", $type, $old_type);
-  cache_clear_all('*', 'cache_node', TRUE);
   return db_affected_rows();
 }
 
@@ -601,17 +600,6 @@ function node_invoke_nodeapi(&$node, $op, $a3 = NULL, $a4 = NULL) {
 /**
  * Load a node object from the database.
  *
- * This function provides two levels of caching. The internal cache stores
- * all nodes loaded in this request. Use the $reset argument to invalidate
- * it. The cache API based cache stores all nodes throughout requests,
- * until invalidated with cache_clear_all().
- *
- * If the load operation was cached previously, we load the data from
- * that cache, and no nodeapi load operations are called. That means,
- * that we expect all load operations to return the same data and do
- * not use any conditions on the user, language or anything else,
- * which would limit what is stored in the node_load cache.
- *
  * @param $param
  *   Either the nid of the node or an array of conditions to match against in the database query
  * @param $revision
@@ -633,13 +621,7 @@ function node_load($param = array(), $revision = NULL, $reset = NULL) {
   $arguments = array();
   if (is_numeric($param)) {
     if ($cachable) {
-      if (!isset($nodes[$param])) {
-        if ($cache = cache_get($param, 'cache_node')) {
-          $nodes[$param] = $cache->data;
-        }
-      }
-      // Either the node was statically cached or we loaded from the
-      // cache_node table.
+      // Is the node statically cached?
       if (isset($nodes[$param])) {
         return is_object($nodes[$param]) ? drupal_clone($nodes[$param]) : $nodes[$param];
       }
@@ -685,11 +667,6 @@ function node_load($param = array(), $revision = NULL, $reset = NULL) {
     }
     if ($cachable) {
       $nodes[$node->nid] = is_object($node) ? drupal_clone($node) : $node;
-      // We can only cache when a nid is given, otherwise the conditions are
-      // too dynamic to be cacheable.
-      if (is_numeric($param)) {
-        cache_set($param, $nodes[$node->nid], 'cache_node');
-      }
     }
   }
 
@@ -886,8 +863,6 @@ function node_save(&$node) {
 
   // Clear the page and block caches.
   cache_clear_all();
-  // Clear the node load cache for this node.
-  cache_clear_all($node->nid, 'cache_node');
 }
 
 /**
@@ -1218,7 +1193,6 @@ function node_user($op, &$edit, &$user) {
   if ($op == 'delete') {
     db_query('UPDATE {node} SET uid = 0 WHERE uid = %d', $user->uid);
     db_query('UPDATE {node_revisions} SET uid = 0 WHERE uid = %d', $user->uid);
-    cache_clear_all('*', 'cache_node', TRUE);
   }
 }
 

modules/node/node.schema

@@ -105,7 +105,5 @@ function node_schema() {
     'primary key' => array('type'),
   );
 
-  $schema['cache_node'] = drupal_get_schema_unprocessed('system', 'cache');
-
   return $schema;
 }

modules/system/system.admin.inc

@@ -821,7 +821,6 @@ function system_modules_submit($form, &$form_state) {
     node_types_rebuild();
     menu_rebuild();
     cache_clear_all('schema', 'cache');
-    cache_clear_all('*', 'cache_node', TRUE);
     drupal_set_message(t('The configuration options have been saved.'));
   }
 

modules/system/system.install

@@ -3698,24 +3698,8 @@ function system_update_6027() {
  * Add the node load cache table.
  */
 function system_update_6028() {
-  $ret = array();
-
-  // Create the cache_node table.
-  $schema['cache_node'] = array(
-    'fields' => array(
-      'cid'        => array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => ''),
-      'data'       => array('type' => 'blob', 'not null' => FALSE, 'size' => 'big'),
-      'expire'     => array('type' => 'int', 'not null' => TRUE, 'default' => 0),
-      'created'    => array('type' => 'int', 'not null' => TRUE, 'default' => 0),
-      'headers'    => array('type' => 'text', 'not null' => FALSE),
-      'serialized' => array('type' => 'int', 'size' => 'small', 'not null' => TRUE, 'default' => 0)
-    ),
-    'indexes' => array('expire' => array('expire')),
-    'primary key' => array('cid'),
-  );
-  db_create_table($ret, 'cache_node', $schema['cache_node']);
-
-  return $ret;
+  // Removed node_load cache to discuss it more for Drupal 7.
+  return array();
 }
 
 /**

modules/translation/translation.module

@@ -256,7 +256,6 @@ function translation_nodeapi(&$node, $op, $teaser, $page) {
           db_query("UPDATE {node} SET tnid = %d, translate = %d WHERE nid = %d", $tnid, 0, $node->translation_source->nid);
         }
         db_query("UPDATE {node} SET tnid = %d, translate = %d WHERE nid = %d", $tnid, 0, $node->nid);
-        translation_clear_node_cache($tnid);
       }
       break;
 
@@ -268,7 +267,6 @@ function translation_nodeapi(&$node, $op, $teaser, $page) {
           // This is the source node, asking to mark all translations outdated.
           db_query("UPDATE {node} SET translate = 1 WHERE tnid = %d AND nid != %d", $node->tnid, $node->nid);
         }
-        translation_clear_node_cache($node->tnid);
       }
       break;
 
@@ -297,25 +295,10 @@ function translation_remove_from_set($node) {
         $new_tnid = db_result(db_query('SELECT nid FROM {node} WHERE tnid = %d ORDER BY translate ASC, nid ASC', $node->tnid));
         db_query('UPDATE {node} SET tnid = %d WHERE tnid = %d', $new_tnid, $node->tnid);
       }
-      translation_clear_node_cache($node->tnid);
     }
   }
 }
 
-/**
- * Clear node_load cache for all nodes in the translation set, so we have
- * the proper translation set information in every node.
- * 
- * @param $tnid
- *   The translation source nid of the translation set, the identifier
- *   of the node used to derive all translations in the set.
- */
-function translation_clear_node_cache($tnid) {
-  foreach (translation_node_get_translations($tnid) as $node) {
-    cache_clear_all($node->nid, 'cache_node');
-  }
-}
-
 /**
  * Get all nodes in a translation set, represented by $tnid.
  *