jt2594838 commented on code in PR #16425:
URL: https://github.com/apache/iotdb/pull/16425#discussion_r2357807274
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iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/analyze/cache/schema/dualkeycache/impl/FIFOCacheEntryManager.java:
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@@ -171,28 +186,40 @@ public int hashCode() {
private static class FIFOLinkedList<SK, V> {
// head.next is the newest
- private final FIFOCacheEntry head;
- private final FIFOCacheEntry tail;
+ private final FIFOCacheEntry<SK, V> head;
+ private final FIFOCacheEntry<SK, V> tail;
public FIFOLinkedList() {
- head = new FIFOCacheEntry(null, null, null);
- tail = new FIFOCacheEntry(null, null, null);
+ head = new FIFOCacheEntry<>(null, null, null);
+ tail = new FIFOCacheEntry<>(null, null, null);
head.next = tail;
tail.pre = head;
}
- synchronized void add(FIFOCacheEntry cacheEntry) {
- cacheEntry.next = head.next;
+ synchronized void add(final FIFOCacheEntry<SK, V> cacheEntry) {
+ FIFOCacheEntry<SK, V> nextEntry;
+
+ do {
+ nextEntry = head.next;
+ } while (nextEntry.isInvalidated.get());
Review Comment:
So, if `nextEntry.isInvalidated` is set to true, there must be another
thread that will modify head.next?
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