protected void resetKVHeap(List<? extends KeyValueScanner> scanners, CellComparator comparator)
    throws IOException {
    // Combine all seeked scanners with a heap
    heap = newKVHeap(scanners, comparator);
  }
Seek the specified scanners with the given key
@param isLazy         true if using lazy seek
@param isParallelSeek true if using parallel seek
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/StoreScanner.java