private void assertAccessAvailable() {
        if (isClose.get()) {
            throw new HBaseAccessException("Already closed");
        }
    }
@author emeroad
@author HyunGil Jeong
@author minwoo.jung
@author Taejin Koo
commons-hbase/src/main/java/com/navercorp/pinpoint/common/hbase/HbaseTemplate.java