smengcl commented on code in PR #8912:
URL: https://github.com/apache/ozone/pull/8912#discussion_r2331508488
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hadoop-hdds/rocksdb-checkpoint-differ/src/main/java/org/apache/ozone/rocksdb/util/SstFileSetReader.java:
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@@ -233,70 +236,149 @@ public String next() {
}
}
- private abstract static class MultipleSstFileIterator<T> implements
ClosableIterator<T> {
+ /**
+ * A wrapper class that holds an iterator and its current value for heap
operations.
+ */
+ private static class HeapEntryWithFileIdx<T extends Comparable<T>>
+ implements Comparable<HeapEntryWithFileIdx<T>> {
+ private final ClosableIterator<T> iterator;
+ private T currentKey;
+ // To ensure stable ordering for identical keys
+ private final int fileIndex;
Review Comment:
Purpose of fileIndex is to keep track of which sst file has higher index
when multiple entries exist. When there are duplicates, values in SST files
with higher index should be in the result.
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