/**
* Set the start row for the replica callable based on the state of the last result received.
*
* @param callable The callable to set the start row on
*/
private void setStartRowForReplicaCallable(ScannerCallable callable) {
if (this.lastResult == null || callable == null) return;
if (this.lastResult.isPartial()) {
// The last result was a partial result which means we have not received all of the cells
// for this row. Thus, use the last result's row as the start row. If a replica switch
// occurs, the scanner will ensure that any accumulated partial results are cleared,
// and the scan can resume from this row.
callable.getScan().setStartRow(this.lastResult.getRow());
} else {
// The last result was not a partial result which means it contained all of the cells for
// that row (we no longer need any information from it). Set the start row to the next
// closest row that could be seen.
if (callable.getScan().isReversed()) {
callable.getScan().setStartRow(createClosestRowBefore(this.lastResult.getRow()));
} else {
callable.getScan().setStartRow(Bytes.add(this.lastResult.getRow(), new byte[1]));
}
}
}
private int addCallsForOtherReplicas(
BoundedCompletionService<Pair<Result[], ScannerCallable>> cs,
RegionLocations rl,
int min,
int max) {
if (scan.getConsistency() == Consistency.STRONG) {
return 0; // not scheduling on other replicas for strong consistency
}
for (int id = min; id <= max; id++) {
if (currentScannerCallable.getHRegionInfo().getReplicaId() == id) {
continue; // this was already scheduled earlier
}
ScannerCallable s = currentScannerCallable.getScannerCallableForReplica(id);
if (this.lastResult != null) {
s.getScan().setStartRow(this.lastResult.getRow());
}
outstandingCallables.add(s);
RetryingRPC retryingOnReplica = new RetryingRPC(s);
cs.submit(retryingOnReplica);
}
return max - min + 1;
}
