How to use

setReadaheadThreshold

method

in

org.apache.accumulo.core.client.Scanner

private Iterator<Entry<Key,Value>> newIterator(Range r) {
 synchronized (scanner) {
  scanner.enableIsolation();
  scanner.setBatchSize(batchSize);
  scanner.setTimeout(timeout, TimeUnit.MILLISECONDS);
  scanner.setRange(r);
  scanner.setReadaheadThreshold(readaheadThreshold);
  setOptions((ScannerOptions) scanner, opts);
  return scanner.iterator();
  // return new FaultyIterator(scanner.iterator());
 }
}

smi.scanner.setTimeout(timeOut, TimeUnit.MILLISECONDS);
smi.scanner.setBatchTimeout(batchTimeOut, TimeUnit.MILLISECONDS);
smi.scanner.setReadaheadThreshold(readaheadThreshold);
if (isolated)
 smi.scanner.enableIsolation();

scanner.setReadaheadThreshold(Long.MAX_VALUE);
scanner.setBatchSize(1);

  setQueryColumns(s, metric, orderedTags, colFamValues);
  s.setBatchSize(scannerBatchSize);
  s.setReadaheadThreshold(scannerReadAhead);
  return s;
} catch (IllegalArgumentException | TableNotFoundException ex) {

private Iterator<Entry<Key,Value>> newIterator(Range r) {
 synchronized (scanner) {
  scanner.enableIsolation();
  scanner.setBatchSize(batchSize);
  scanner.setTimeout(timeout, TimeUnit.MILLISECONDS);
  scanner.setRange(r);
  scanner.setReadaheadThreshold(readaheadThreshold);
  setOptions((ScannerOptions) scanner, opts);
  return scanner.iterator();
  // return new FaultyIterator(scanner.iterator());
 }
}

((Scanner) baseScanner).setReadaheadThreshold(Long.MAX_VALUE);

smi.scanner.setTimeout(timeOut, TimeUnit.MILLISECONDS);
smi.scanner.setBatchTimeout(batchTimeOut, TimeUnit.MILLISECONDS);
smi.scanner.setReadaheadThreshold(readaheadThreshold);
if (isolated)
 smi.scanner.enableIsolation();

scanner.setReadaheadThreshold(20000);
scanner.setRange(new Range(String.format("%08d", 0), String.format("%08d", 1000)));

s.setReadaheadThreshold(Long.MAX_VALUE);
s.setBatchSize(1);
s.setRange(new Range());
s.setRange(new Range());
s.setBatchSize(1);
s.setReadaheadThreshold(0l);