StoreScanner leaked in KeyValueHeap

KeyValueHeap#generalizedSeek
KeyValueScanner scanner = current;
while (scanner != null) {
Cell topKey = scanner.peek();
......
boolean seekResult;
if (isLazy && heap.size() > 0)

{ // If there is only one scanner left, we don't do lazy seek. seekResult = scanner.requestSeek(seekKey, forward, useBloom); }

else

{ seekResult = NonLazyKeyValueScanner.doRealSeek(scanner, seekKey, forward); }

......
scanner = heap.poll();
}
(1) scanner = heap.poll(); Retrieves and removes the head of this queue
(2) scanner.requestSeek(seekKey, forward, useBloom); or NonLazyKeyValueScanner.doRealSeek(scanner, seekKey, forward);
throw exception, and scanner will have no chance to close, so will cause the scanner leak.