public void setRunningInstanceCount(Integer runningInstanceCount) {
        this.runningInstanceCount = runningInstanceCount;
    }
<p>
The number of instances currently running in this instance group.
</p>

@param runningInstanceCount
       The number of instances currently running in this instance group.
aws-java-sdk-emr/src/main/java/com/amazonaws/services/elasticmapreduce/model/InstanceGroup.java