private void scheduleRenewLeaseTask() {
      leaseRenewer = retryTimer.newTimeout(t -> tryRenewLease(), scannerLeaseTimeoutPeriodNs / 2,
        TimeUnit.NANOSECONDS);
    }
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