Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/9241#discussion_r43464654
--- Diff:
core/src/main/java/org/apache/spark/unsafe/map/BytesToBytesMap.java ---
@@ -219,61 +230,158 @@ public BytesToBytesMap(
*/
public int numElements() { return numElements; }
- public static final class BytesToBytesMapIterator implements
Iterator<Location> {
+ public final class MapIterator implements Iterator<Location> {
- private final int numRecords;
- private final Iterator<MemoryBlock> dataPagesIterator;
+ private int numRecords;
private final Location loc;
private MemoryBlock currentPage = null;
- private int currentRecordNumber = 0;
+ private int recordsInPage = 0;
private Object pageBaseObject;
private long offsetInPage;
// If this iterator destructive or not. When it is true, it frees each
page as it moves onto
// next one.
private boolean destructive = false;
- private BytesToBytesMap bmap;
+ private LinkedList<UnsafeSorterSpillWriter> spillWriters = new
LinkedList<>();
+ private UnsafeSorterSpillReader reader = null;
- private BytesToBytesMapIterator(
- int numRecords, Iterator<MemoryBlock> dataPagesIterator, Location
loc,
- boolean destructive, BytesToBytesMap bmap) {
+ private MapIterator(int numRecords, Location loc, boolean destructive)
{
this.numRecords = numRecords;
- this.dataPagesIterator = dataPagesIterator;
this.loc = loc;
this.destructive = destructive;
- this.bmap = bmap;
- if (dataPagesIterator.hasNext()) {
- advanceToNextPage();
+ if (destructive) {
+ destructiveIterator = this;
}
}
private void advanceToNextPage() {
- if (destructive && currentPage != null) {
- dataPagesIterator.remove();
- this.bmap.taskMemoryManager.freePage(currentPage);
+ synchronized (this) {
+ int nextIdx = dataPages.indexOf(currentPage) + 1;
+ if (destructive && currentPage != null) {
+ dataPages.remove(currentPage);
+ freePage(currentPage);
+ nextIdx --;
+ }
+ if (dataPages.size() > nextIdx) {
+ currentPage = dataPages.get(nextIdx);
+ pageBaseObject = currentPage.getBaseObject();
+ offsetInPage = currentPage.getBaseOffset();
+ recordsInPage = Platform.getInt(pageBaseObject, offsetInPage);
+ offsetInPage += 4;
+ } else {
+ currentPage = null;
+ if (reader != null) {
+ // remove the spill file from disk
+ File file = spillWriters.removeFirst().getFile();
+ if (file != null && file.exists()) {
+ if (!file.delete()) {
+ logger.error("Was unable to delete spill file {}",
file.getAbsolutePath());
+ }
+ }
+ }
+ try {
+ reader = spillWriters.getFirst().getReader(blockManager);
+ recordsInPage = -1;
--- End diff --
Ah, because we rely on `reader.hasNext()` when we're dealing with on-disk
data.
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