namenode

常見例句

• The Datanodes also perform block creation, deletion, and replication upon instruction from the Namenode.
  數(shù)據(jù)節(jié)點執(zhí)行來自于名字節(jié)點的建立、刪除、復(fù)制指令.
• dfs.secondary.http.address ：The secondary namenode http server address and port.
  如果port為0，則端口就會使用隨機的可用port。
• 1.Replication of data blocks does not occur when the NameNode is in the Safemode state.
  并不是全部檢測完才退出安全模式，而是達到一個配置的比例的時候。
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