Examples of org.apache.hadoop.hdfs.protocol.AppendBlockHeader.writeVersionAndOpCode()

          AppendBlockHeader headerToSend = new AppendBlockHeader(
              versionAndOpcode.getDataTransferVersion(), namespaceid,
              block.getBlockId(), block.getNumBytes(), block.getGenerationStamp(), pipelineSize,
              hasSrcDataNode, srcDataNode, targets.length - 1, targets,
              client);
          headerToSend.writeVersionAndOpCode(mirrorOut);
          headerToSend.write(mirrorOut);
          blockReceiver.writeChecksumHeader(mirrorOut);
          mirrorOut.flush();


          // read connect ack (only for clients, not for replication req)

          AppendBlockHeader header = new AppendBlockHeader(version,
              dfsClient.namespaceId, block.getBlockId(), block.getNumBytes(), 
              block.getGenerationStamp(),
              pipelineDepth, false, null, pipelineDepth - 1,
              nodes, client);
          header.writeVersionAndOpCode(out);
          header.write(out);
        }
        checksum.writeHeader(out);
        out.flush();

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