public InstanceGroupDetail withInstanceRunningCount(Integer instanceRunningCount) {
        setInstanceRunningCount(instanceRunningCount);
        return this;
    }
<p>
Actual count of running instances.
</p>

@param instanceRunningCount
       Actual count of running instances.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-emr/src/main/java/com/amazonaws/services/elasticmapreduce/model/InstanceGroupDetail.java