LuciferYang commented on code in PR #43502:
URL: https://github.com/apache/spark/pull/43502#discussion_r1369709362
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common/kvstore/src/main/java/org/apache/spark/util/kvstore/RocksDBIterator.java:
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@@ -272,4 +270,32 @@ static int compare(byte[] a, byte[] b) {
return a.length - b.length;
}
+ static class ResourceCleaner implements Runnable {
+
+ private final RocksIterator rocksIterator;
+
+ private final AtomicReference<org.rocksdb.RocksDB> _db;
+
+ private final ConcurrentLinkedQueue<Reference<RocksDBIterator<?>>>
iteratorTracker;
+
+ public ResourceCleaner(RocksIterator rocksIterator,
+ AtomicReference<org.rocksdb.RocksDB> _db,
+ ConcurrentLinkedQueue<Reference<RocksDBIterator<?>>> iteratorTracker) {
+ this.rocksIterator = rocksIterator;
+ this._db = _db;
+ this.iteratorTracker = iteratorTracker;
+ }
+
+ @Override
+ public void run() {
+ synchronized (this._db) {
+ org.rocksdb.RocksDB _db = this._db.get();
+ if (_db == null) {
+ return;
+ }
+ iteratorTracker.removeIf(ref -> ref.get() != null &&
rocksIterator.equals(ref.get().it));
Review Comment:
In addition, it would be better to assign `ref.get()` to an intermediate
variable. Even if the first `ref.get() != null` is true, the second call to
`ref.get()` could still be null?
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