migration is ok again (remains probleme of ram consuming > 4Go for users

web/modules/dev/migrate_booster/src/Command/MigrateBoosterCommand.php

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+<?php
+
+use Drupal\migrate_booster\MigrateBooster;
+use Symfony\Component\Console\Event\ConsoleCommandEvent;
+use Symfony\Component\Console\ConsoleEvents;
+
+/** @noinspection PhpUnusedParameterInspection */
+$GLOBALS['dispatcher']->addListener(ConsoleEvents::COMMAND, function (ConsoleCommandEvent $event) {
+  MigrateBooster::bootDrupal();
+});

web/modules/dev/migrate_booster/src/Commands/MigrateBoosterCommands.php

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+<?php
+namespace Drupal\migrate_booster\Commands;
+
+use Consolidation\AnnotatedCommand\AnnotationData;
+use Drupal\migrate_booster\MigrateBooster;
+use Drush\Commands\DrushCommands;
+use Symfony\Component\Console\Input\InputInterface;
+
+/**
+ *
+ * In addition to a commandfile like this one, you need a drush.services.yml
+ * in root of your module.
+ *
+ * See these files for an example of injecting Drupal services:
+ *   - http://cgit.drupalcode.org/devel/tree/src/Commands/DevelCommands.php
+ *   - http://cgit.drupalcode.org/devel/tree/drush.services.yml
+ */
+class MigrateBoosterCommands extends DrushCommands {
+
+  /**
+   * Resets migrate booster and implementation cache.
+   *
+   * @command migrate:booster:reset
+   *
+   * @validate-module-enabled migrate_booster
+   * @aliases mbr,migrate-booster-reset
+   */
+  public function boosterReset()
+  {
+      // See bottom of https://weitzman.github.io/blog/port-to-drush9 for details on what to change when porting a
+      // legacy command.
+    MigrateBooster::reset();
+  }
+
+  /**
+   * Enables migrate booster and implementation cache.
+   *
+   * @command migrate:booster:enable
+   *
+   * @validate-module-enabled migrate_booster
+   * @aliases mbe,migrate-booster-enable
+   */
+  public function boosterEnable()
+  {
+    // See bottom of https://weitzman.github.io/blog/port-to-drush9 for details on what to change when porting a
+    // legacy command.
+
+    MigrateBooster::enable();
+  }
+
+  /**
+   * @hook init *
+   */
+  public function initCommand(InputInterface $input, AnnotationData $annotationData) {
+    // Skip when bootstrap level is low (e.g. drush cr)
+    if (!\Drupal::hasContainer()) {
+      return;
+    }
+    MigrateBooster::bootDrush($input, $annotationData);
+  }
+}

web/modules/dev/migrate_booster/src/HooksEnablerSubscriber.php

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+<?php
+
+namespace Drupal\migrate_booster;
+
+use Symfony\Component\HttpKernel\KernelEvents;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+/**
+* Provides a MyModuleSubscriber.
+*/
+class HooksEnablerSubscriber implements EventSubscriberInterface {
+
+  /**
+  * {@inheritdoc}
+  */
+  static function getSubscribedEvents() {
+    $events[KernelEvents::REQUEST][] = array('ensureHooksEnabled', 20);
+    return $events;
+  }
+
+  /**
+   * Triggers on 'kernel.request' event which occurs when Drupal
+   * bootstraps (but not when Drush or Drupal console command runs).
+   */
+  public function ensureHooksEnabled() {
+    MigrateBooster::bootDrupal();
+  }
+
+}

web/modules/dev/migrate_booster/src/MigrateBooster.php

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+<?php
+
+namespace Drupal\migrate_booster;
+
+use Consolidation\AnnotatedCommand\AnnotationData;
+use Symfony\Component\Console\Input\InputInterface;
+
+class MigrateBooster {
+
+  protected static $alterActive;
+  protected static $config;
+  const CID = 'migrate_booster_enabled';
+
+  // Startup hooks
+
+  /**
+   * Reacts on HOOK_drush_init().
+   *
+   * Enables/disables booster depending on a drush command invoked.
+   */
+  public static function bootDrush(InputInterface $input, AnnotationData $annotationData) {
+    if (in_array($annotationData['command'], static::getConfig('commands'))) {
+      static::enable();
+    }
+    else {
+      static::disable();
+    }
+  }
+
+  /**
+   * Disables booster on Drupal and Drupal console boots.
+   */
+  public static function bootDrupal() {
+    static::disable();
+  }
+
+  /**
+   * Enables booster.
+   *
+   * Resets implementation cache and sets $alterActive class variable.
+   *
+   */
+  public static function enable() {
+    static::$alterActive = TRUE;
+    static::reset();
+  }
+
+  /**
+   * Disables booster.
+   *
+   * Resets implementation cache.
+   */
+  public static function disable() {
+    static::reset();
+  }
+
+  /**
+   * Resets implementations cache.
+   */
+  public static function reset() {
+    $module_handler = \Drupal::moduleHandler();
+    $module_handler->resetImplementations();
+  }
+
+  /** @noinspection PhpInconsistentReturnPointsInspection */
+
+  /**
+   * Implements hook_module_implementation_alter().
+   *
+   * Disables configured hooks.
+   * @param $implementations
+   * @param $hook
+   * @return null
+   */
+  public static function alter(&$implementations, $hook) {
+    if (!static::$alterActive) {
+      return NULL;
+    }
+    if (!$implementations) {
+      return NULL;
+    }
+    $hooks = static::getConfig('hooks');
+    $modules = static::getConfig('modules');
+    $disabled = [];
+    // Disable by hook + module
+    if (array_key_exists($hook, $hooks)) {
+      $disabled = array_intersect_key($implementations, array_flip($hooks[$hook]));
+    }
+    // Disable by module
+    $disabled += array_intersect_key($implementations, array_flip($modules));
+    $implementations = array_diff_key($implementations, $disabled);
+    /** @noinspection PhpUnusedParameterInspection */
+    array_walk($disabled, function ($el, $key) use ($hook) {
+      error_log('DISABLED: ' . $key . '_' . $hook);
+    });
+  }
+
+  /**
+   * Helper functions
+   *
+   * @param $key
+   * @return array
+   */
+  protected static function getConfig($key) {
+    if (!static::$config) {
+      static::$config = \Drupal::config('migrate_booster.settings')->get();
+    }
+    if ($key && isset(static::$config[$key])) {
+      return static::$config[$key];
+    }
+
+    return [];
+  }
+
+}