nileshkumar3 commented on code in PR #22643:
URL: https://github.com/apache/kafka/pull/22643#discussion_r3456954966
##########
streams/src/main/java/org/apache/kafka/streams/state/internals/RocksDBTransactionBuffer.java:
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@@ -175,31 +178,72 @@ ManagedKeyValueIterator<Bytes, byte[]>
newBaseIterator(final Bytes from, final B
return newBaseIterator(cfHandle, from, to, forward, toInclusive);
}
+ @Override
+ ManagedKeyValueIterator<Bytes, byte[]> newBaseSnapshotIterator(final Bytes
from, final Bytes to,
+ final
boolean forward, final boolean toInclusive) {
+ return newBaseSnapshotIterator(cfHandle, from, to, forward,
toInclusive);
+ }
+
private ManagedKeyValueIterator<Bytes, byte[]> newBaseIterator(final
ColumnFamilyHandle cf,
final Bytes
from, final Bytes to,
final
boolean forward, final boolean toInclusive) {
final RocksIterator rocksIterator = db.newIterator(cf);
- final ManagedKeyValueIterator<Bytes, byte[]> iter;
+ final ManagedKeyValueIterator<Bytes, byte[]> iter =
+ buildBaseIterator(rocksIterator, from, to, forward, toInclusive);
+ // RocksDbIterator requires onClose to be set before close() is called.
+ // Since this iterator is used internally by StagedMergeIterator (not
+ // tracked by RocksDBStore's open-iterator set), use a no-op callback.
+ iter.onClose(() -> { });
+ return maybeWrapRangeTombstones(iter);
+ }
+
+ private ManagedKeyValueIterator<Bytes, byte[]>
newBaseSnapshotIterator(final ColumnFamilyHandle cf,
+
final Bytes from, final Bytes to,
+
final boolean forward, final boolean toInclusive) {
+ final Snapshot snapshot = db.getSnapshot();
Review Comment:
Yes — the snapshot is released when the iterator is closed:
SnapshotReleasingIterator.close() calls db.releaseSnapshot(snapshot) and
readOptions.close() after closing the delegate iterator, and the try/finally in
newBaseSnapshotIterator releases them if construction fails. Am I missing
something ?
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