private boolean isClosing() {
      if (getCache().isClosed()) {
        return true;
      }
      CancelCriterion stopper = getCache().getCancelCriterion();
      return stopper.isCancelInProgress();
    }
A non-backup just needs values that are written to one of the oplogs being compacted that are
still alive (have not been deleted or modified in a future oplog) to be copied forward to the
current active oplog
geode-core/src/main/java/org/apache/geode/internal/cache/DiskStoreImpl.java