摘要： NameNode向NameNode请求getProtocolVersion()DataNode向NameNode请求getProtocolVersion()DataNode向NameNode请求versionRequest()DataNode向NameNode发送register()DataNode向NameNode发送sendHeartbeat()DataNode向NameNode发送blockReport()JobTracker向NameNode请求getProtocolVersion()TaskTracker向JobTracker请求getProtocolVersion()DataNod 阅读全文