@Override
      public void run() {
        while (!stopped) {
          // keep triggering chunk retirement
          mslab.copyCellInto(cellToCopyInto);
        }
      }
Test frequent chunk retirement with chunk pool triggered by lots of threads, making sure
there's no memory leak (HBASE-16195)
@throws Exception if any error occurred
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestMemstoreLABWithoutPool.java