HDFS capacity

[#1]

our HDFS cluster size is 16 TB. have 3 data nodes and 1 name node.

1.how to find out the storage size alloted for 3 data nodes ?

2. Does name node uses only RAM memory ? how to find its capacity as well

[#2 · Accepted solution]

You can check data nodes hdfs configured capacity by

1. Going into namenode UI http://namenodeIp:50070/dfshealth.html#tab-datanode

2. from command line use hadoop dfsadmin -report

namenode.png

[#3]

Namenode ram capacity can be found in namenode ui only

[#4]

Thanks much. Name node uses only RAM memory?..no space is required as such data node ?

[#5]

@Ram Note that disks are required for NN also. See post related to sizing of NN. https://community.hortonworks.com/questions/1692/any-recommendation-on-how-to-partition-disk-space.h...