MAGETWO-64602: Sync config file with DB: Validation

Author: Bohdan Korablov

app/code/Magento/Deploy/Console/Command/App/ConfigImportCommand.php

@@ -14,6 +14,10 @@
 
 /**
  * Imports data from deployment configuration files to the DB.
+ *
+ * We have configuration files that are shared between environments, but sometime we need read
+ * some configurations only from the DB (e.g., themes, scopes and etc). This command check changes of specific sections
+ * (which are defined in di.xml) in configuration files, and import them if are needed.
  */
 class ConfigImportCommand extends Command
 {

lib/internal/Magento/Framework/App/DeploymentConfig/ImporterInterface.php

@@ -17,8 +17,8 @@ interface ImporterInterface
      *
      * @param array $data Data that should be imported
      * @return string[] The array of messages that generated during importing
-     * @throws InvalidTransitionException In case of any exceptions
-     * during importing. All changed during importing data is rolled back
+     * @throws InvalidTransitionException In case of errors during importing (e.g., cannot save some data).
+     * All changed during importing data is rolled back
      */
     public function import(array $data);
 }