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To: Chengzheng Sun, David Sun, Agustina, Weiwei Cai

Thanks for the paper, it was very interesting to read.

Unfortunately the paper is having a strong direction of:

CRDT vs. OT

but that is not helpful in practice.

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<?php

namespace Drupal\Core\Cache;

use Drupal\Component\Assertion\Inspector;

/**
 * Stores cache items in /dev/shm.
 */
class ShmBackend implements CacheBackendInterface {

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diff --git a/web/core/lib/Drupal/Core/Cache/ApcuBackendFactory.php b/web/core/lib/Drupal/Core/Cache/ApcuBackendFactory.php
--- a/web/core/lib/Drupal/Core/Cache/ApcuBackendFactory.php
+++ b/web/core/lib/Drupal/Core/Cache/ApcuBackendFactory.php
@@ -46,6 +46,9 @@ public function __construct($root, $site_path, CacheTagsChecksumInterface $check
     else {
       $this->backendClass = 'Drupal\Core\Cache\Apcu4Backend';
     }
+
+    $this->backendClass = 'Drupal\Core\Cache\CFAwareApcuBackend';
+    //$this->backendClass = 'Drupal\Core\Cache\ShmBackend';

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<?php

namespace Drupal\Core\Cache;

use Drupal\Component\Assertion\Inspector;

/**
 * Stores cache items in the Alternative PHP Cache User Cache (APCu).
 */
class CFAwareApcuBackend extends ApcuBackend {

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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <pthread.h>

#ifdef _MSC_VER
#include <intrin.h> /* for rdtscp and clflush */
#pragma optimize("gt",on)
#else
#include <x86intrin.h> /* for rdtscp and clflush */

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<?php

function yac_store() {
  static $yac;

  if (!isset($yac)) {
    $yac = new Yac('');
  }

  return $yac;

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<?php

/**
 * @file
 *
 * Contains Drupal\newsletter_view\Controller\NewsletterViewNodeController
 */

namespace Drupal\newsletter_view\Controller;

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<?php

function foo() {}

function bar() {}

function crash_merge($attached) {
  $merge = [ 'html_head' => ['2']];

  $attached = array_merge_recursive(

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diff --git a/core/modules/big_pipe/big_pipe.module b/core/modules/big_pipe/big_pipe.module
index 724cd1c..f1af3a4 100644
--- a/core/modules/big_pipe/big_pipe.module
+++ b/core/modules/big_pipe/big_pipe.module
@@ -18,8 +18,16 @@
 function big_pipe_js_settings_alter(&$settings) {
   // Store the settings for later usage.
   if (isset($settings['bigPipeResponseMarker'])) {
-    \Drupal::service('big_pipe')->setAjaxPageState(isset($settings['ajaxPageState']) ? $settings['ajaxPageState'] : NULL);
+    $ajax_page_state = isset($settings['ajaxPageState']) ? $settings['ajaxPageState'] : NULL;

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<?php

// ...

    if (!empty($half_pipe_placeholders)) {
      $extra_attachments = $this->doHalfPipe($page_parts[0], $half_pipe_placeholders);
      // Print the extra attachments.
      if (!empty($extra_attachments['library']) || !empty($extra_attachments['drupalSettings'])) {
        $all_attachments = BubbleableMetadata::mergeAttachments($attachments, $extra_attachments);