code: public Block[] getBlocksBeingWrittenReport(int namespaceId) throws IOException {
      LightWeightHashSet<Block> blockSet = new LightWeightHashSet<Block>();
      volumes.getBlocksBeingWrittenInfo(namespaceId, blockSet);
      Block blockTable[] = new Block[blockSet.size()];
      int i = 0;
        for (Iterator<Block> it = blockSet.iterator(); it.hasNext(); i++) {
      blockTable[i] = it.next();
      }
      return blockTable;
    }
docs: Return a table of blocks being written data
  @throws IOException