Hi,
We're using Hadoop 0.18.2/Hbase 0.18.1 four-nodes cluster on CentOS Linux, in /etc/hosts the following mapping were added to make hadoop to use internal IPs (fast Ethernet 1GB card): 10.1.0.56 master.hostname master 10.1.0.55 slave1.hostname slave1 10.1.0.53 slave3.hostname slave3 10.1.0.50 slave2.hostname slave2 If I do local copy to hadoop dfs it works perfectly, hadoop is using internal IP only to copy data, but when Map-Reduce job starts it's clear( from monitoring network cards data) that hadoop is using external IP in addition to internal with pretty big rates ~5Mb/s in each node, is it something I should add in hadoop configuration to force hadoop to use only internal(LAN) IP? Genady Gilin
