hadoop安装注意防火墙问题

1:hadoop安装注意防火墙问题

2:secondarynamenode 通过dfs.http.address获取namenode的block进行checkpoint操作,

dfs.http.address 0.0.0.0:50070 The namenode’s HTTP server address and port
dfs.datanode.http.address 0.0.0.0:50075 The datanode’s HTTP server address and port
dfs.secondary.http.address 0.0.0.0:50090 The secondary namenode’s HTTP server address and
port

因此当secondaryname和namenode不在同一节点上时必须配置dfs.http.address