private static int getValueLength(DiskId did) {
      int result = 0;
      if (did != null) {
        synchronized (did) {
          result = did.getValueLength();
        }
      }
      return result;
    }
Updates the value of the disk entry with a new value. This allows us to free up disk space in
the non-backup case.
geode-core/src/main/java/org/apache/geode/internal/cache/entries/DiskEntry.java