Hi,
I'm beginner in Hadoop concepts. I have few basic questions:
1) looking for APIs to retrieve the capacity of the cluster. so that i can
write a script to when to add a new slave node to the cluster
a) No.of Task trackers and capacity of each task tracker to
spawn max No.of Mappers
b) CPU,RAM and disk capacity of each tracker
c) how to decide to add a new slave node to the cluster
2) what is the API to retrieve metrics like current usage of resources and
currently running/spawned Mappers/Reducers
3) what is the purpose of Hadoop-common?Is it API to interact with hadoop
I referred following URL:
for Hadoop common :
http://hadoop.apache.org/common/docs/current/api/org/apache/hadoop/mapred/
Capacity scheduler :
http://hortonworks.com/blog/understanding-apache-hadoops-capacity-scheduler/
Regards,
Nagaraju B
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