org.apache.phoenix.iterate

Interface ParallelScanGrouper

All Known Implementing Classes:

DefaultParallelScanGrouper, MapReduceParallelScanGrouper

public interface ParallelScanGrouper

Interface for a parallel scan grouper

Method Summary

Methods

Modifier and Type	Method and Description
List<HRegionLocation>	getRegionBoundaries(StatementContext context, byte[] tableName)
boolean	shouldStartNewScan(QueryPlan plan, List<Scan> scans, byte[] startKey, boolean crossedRegionBoundary) Determines whether to create a new group of parallel scans.

Method Detail

shouldStartNewScan

boolean shouldStartNewScan(QueryPlan plan,
                         List<Scan> scans,
                         byte[] startKey,
                         boolean crossedRegionBoundary)

Determines whether to create a new group of parallel scans.

Parameters:

scans - current scan group

plan - current query plan

startKey - start key of scan

crossedRegionBoundary - whether we crossed a region boundary

Returns:

true if we should create a new group of scans

getRegionBoundaries

List<HRegionLocation> getRegionBoundaries(StatementContext context,
                                        byte[] tableName)
                                          throws SQLException

Throws:

SQLException