Preventing a node from running reduce task in hadoop

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I have a master node and a slave node in hadoop cluster.

Master is also configured to function as slave by starting nodemanager & datanode in it.

Map phase is working in both master and slave node perfectly.

I have only 1 reduce phase, but it runs only in slave node.

Slave node has less disk capacity so when it fails reduce task will work in master node.

I do not want to start reduce task in slave node.

Is there any configuration to prevent reduce task to invoke in a specific node (in my case in slave node)?

In master all hadoop services are running. In slave nodemanager & datanode are running.

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