ambari/ambari-web/app/assets/data/services/summary/hdfs.json

{
  "hdfs": {
    "service_type": "HDFS",
    "installed": true,
    "namenode_addr": "ec2-23-21-1-25.compute-1.amazonaws.com:50070",
    "secondary_namenode_addr": "ec2-23-21-1-25.compute-1.amazonaws.com:50090",
    "total_nodes": "1",
    "memory_heap_used": 151642616,
    "memory_heap_max": 453050368,
    "dfs_dirfiles_count": 252,
    "dfs_blocks_total": 146,
    "dfs_blocks_underreplicated": 145,
    "dfs_blocks_missing": 0,
    "dfs_blocks_corrupt": 0,
    "dfs_state": "Operational",
    "start_time": 1348935028,
    "live_nodes": 1,
    "dead_nodes": 0,
    "decommissioning_nodes": 0,
    "version": "1.0.3.15, r",
    "safemode": false,
    "pending_upgrades": false,
    "dfs_configured_capacity": 885570207744,
    "dfs_percent_used": 4.91,
    "dfs_percent_remaining": 95.09,
    "dfs_total_bytes": 885570207744,
    "dfs_used_bytes": 104898560,
    "nondfs_used_bytes": 43365113856,
    "dfs_free_bytes": 842100195328
  }
}