Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/6159#discussion_r30483774
--- Diff:
unsafe/src/main/java/org/apache/spark/unsafe/map/BytesToBytesMap.java ---
@@ -162,6 +169,55 @@ public BytesToBytesMap(
*/
public int size() { return size; }
+ private static final class BytesToBytesMapIterator implements
Iterator<Location> {
+
+ private final int numRecords;
+ private final Iterator<MemoryBlock> dataPagesIterator;
+ private final Location loc;
+
+ private int currentRecordNumber = 0;
+ private Object pageBaseObject;
+ private long offsetInPage;
+
+ BytesToBytesMapIterator(int numRecords, Iterator<MemoryBlock>
dataPagesIterator, Location loc) {
+ this.numRecords = numRecords;
+ this.dataPagesIterator = dataPagesIterator;
+ this.loc = loc;
+ if (dataPagesIterator.hasNext()) {
+ advanceToNextPage();
+ }
+ }
+
+ private void advanceToNextPage() {
+ final MemoryBlock currentPage = dataPagesIterator.next();
+ pageBaseObject = currentPage.getBaseObject();
+ offsetInPage = currentPage.getBaseOffset();
+ }
+
+ @Override
+ public boolean hasNext() {
+ return currentRecordNumber != numRecords;
+ }
+
+ @Override
+ public Location next() {
--- End diff --
The current implementation does not follow the javadoc of `Iterator`:
`@throws NoSuchElementException if the iteration has no more elements`.
However, it may be fine since it's an internal API.
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