ClientUpdater getFailedUpdater() {
      if (failedPrimary != null) {
        return failedPrimary.getUpdater();
      } else {
        return null;
      }
    }
Return the cache client updater from the previously failed primary

@return the previous updater or null if there is no previous updater
geode-core/src/main/java/org/apache/geode/cache/client/internal/QueueManagerImpl.java