@Override
    public String toString() {
      StringBuilder sb = new StringBuilder();
      sb.append("dr=").append(region.getDiskRegion().getId());
      sb.append(" versionOnly=").append(versionOnly);
      if (versionOnly) {
        sb.append(" versionTag=").append(tag);
      }
      if (de != null) {
        sb.append(" key=").append(de.getKey());
      } else {
        sb.append(" <END CLEAR>");
      }
      return sb.toString();
    }
Returns a set of the disk regions that are using this disk store. Note that this set is read
only and live (its contents may change if the regions using this disk store changes).
geode-core/src/main/java/org/apache/geode/internal/cache/DiskStoreImpl.java