private void next() {
    nextCallSeq++;
    tries = 1;
    exceptions.clear();
    nextCallStartNs = System.nanoTime();
    call();
  }
This method is used when {@link ScanControllerImpl#suspend} had ever been called to get a
{@link ScanResumerImpl}, but now user stops scan and does not need any more scan results.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncScanSingleRegionRpcRetryingCaller.java