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

@param instanceRunningCount
       Actual count of running instances.
aws-java-sdk-emr/src/main/java/com/amazonaws/services/elasticmapreduce/model/InstanceGroupDetail.java