public void setCounter(String counterName, long value) {
    AtomicLong c = this.counters.get(counterName);
    if (c != null) {
      c.set(value);
    }
  }
number of rows scanned during scan RPC. Not every row scanned will be returned to the client
since rows may be filtered.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/metrics/ServerSideScanMetrics.java