CODEWITHSUNDEEP
hadoophadoop-yarn
mining
mining

Reputation: 3709

How to configure Hadoop 2.2 to fit this situation?

I have installed the hadoop 2.2 with four machines. They are:

  namenodes: master1,master2
  datanodes: slave1,slave2

The master1 is installed on my notebook, and I want to close the master1 when I sleep. And when the master1 is in the active state, the master2 is in the standby state. When I close my notebook, will the hadoop cluster automatically change the active namenode to the master2?

I don't know if I understand the meaning of hadoop v2's multiple namenodes. Does the feature fit my situation described above? Thanks.

Upvotes: 1

Views: 63

Answers (1)

JamCon
JamCon

Reputation: 2333

You need to use the High Availability feature for the NameNodes. When it detects the Primary NameNode going offline, the Secondary will automatically take over.

There will be a brief hiccup in the operation of the cluster, however, as the Secondary node will delay in responding to block location requests for a short amount of time (30 to 60 seconds usually), giving all Data nodes enough time to point to the new NN.

Upvotes: 1

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