docs: public void createAllDevNullTargets(Exception lastWriteException)
      {
          Map<Integer, SnapshotDataTarget> targets = Maps.newHashMap();
          final AtomicInteger numTargets = new AtomicInteger();
  
          for (Deque<SnapshotTableTask> tasksForSite : m_taskListsForHSIds.values()) {
              for (SnapshotTableTask task : tasksForSite) {
                  // Close any created targets and replace them with DevNull, go web-scale
                  if (task.getTarget(true) != null) {
                      try {
                          task.getTarget().close();
                      } catch (Exception e) {
                          SNAP_LOG.error("Failed closing data target after error", e);
                      }
                  }
  
                  SnapshotDataTarget target = targets.get(task.m_table.getRelativeIndex());
                  if (target == null) {
                      target = new DevNullSnapshotTarget(lastWriteException);
                      final Runnable onClose = new TargetStatsClosure(target,
                              task.m_table.getTypeName(),
                              numTargets,
                              m_snapshotRecord);
                      target.setOnCloseHandler(onClose);
  
                      targets.put(task.m_table.getRelativeIndex(), target);
                      m_targets.add(target);
                      numTargets.incrementAndGet();
                  }
  
                  task.setTarget(target);
              }
          }
      }