hadoop master node slave node datanode

Question

if a master node goes down what happens to the cluster? Can any slave node act as a master? Does it need any additional configuration?

checkout http://stackoverflow.com/questions/7817391/hadoop-datanode-namenode-secondary-namenode-job-tracker-and-task-tracker/7818812#7818812 — frail, Oct 26 '11 at 13:49

score 2 · Answer 1 · answered Oct 26 '11 at 14:24

2

The NameNode and the JobTracker are single points of failure.

answered Oct 26 '11 at 14:24

Donald Miner

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Namenode in hadoop is no longer a SPOF. http://hadoop.apache.org/docs/r2.0.3-alpha/hadoop-yarn/hadoop-yarn-site/HDFSHighAvailabilityWithQJM.html – polerto Apr 09 '13 at 05:23

score 1 · Answer 2 · answered Jul 27 '13 at 08:37

If your Hadoop version 0.21 or higher. then you can configure checkpoint node for back up. If your hadoop version is lesser then it then secondary namenode is there for it.

You can create back up note instead for master failure. Back up node,checkpoint node hardware configuration should be same as namenode.

Enjoy hadooping :)

hadoop master node slave node datanode

2 Answers2