本文主要包含hadoop集群配置,hadoop集群环境搭建,hadoop集群搭建,hadoop集群,hadoop集群安装等服务器相关知识,网友希望可以进行参考
Hadoop集群优化，hadoop集群
Hadoop
namenode vs RM
端口
A port number of 0 instructs the server to start on a free port, but this is generally discouraged because it is incompatible with setting cluster-wide firewall policies.
HDFS
ECC memory
ECC memory is strongly recommended, as several Hadoop users have reported seeing many checksum errors when using non-ECC memory on Hadoop clusters.
dfs.name.dir
配置成多个路径，FSImage和EditLog会同时写入多个路径，方便以后恢复用
RAID
不适合datanode，如果配置成RAID的话，就不需要副本了：
适合namenode：用于保护元数据信息
MapReduce
slowstart
参数mapreduce.job.reduce.slowstart.completedmaps表示map任务完成多少后，reduce任务才能开始执行。将其设置成0.80，以增加集群的吞吐量