code: public void blocksBeingWrittenReport(DatanodeRegistration nodeReg,
        BlockReport blocks) throws IOException {
      verifyRequest(nodeReg);
      long[] blocksAsLong = blocks.getBlockReportInLongs();
      BlockListAsLongs blist = new BlockListAsLongs(blocksAsLong);
      boolean processed = namesystem.processBlocksBeingWrittenReport(nodeReg, blist);
  
      String message = "*BLOCK* NameNode.blocksBeingWrittenReport: "
          +"from "+nodeReg.getName()+" "+blist.getNumberOfBlocks() +" blocks";
      if (!processed) {
        message += " was discarded.";
      }
      stateChangeLog.info(message);
    }
docs: add new replica blocks to the Inode to target mapping
  also add the Inode file to DataNodeDesc