fix: Fix flaky tsan failure in async data cache (#11908)

Summary:
Pull Request resolved: #11908

Mark refresh stats method to avoid tsan check to see if it can prevent tsan failure. The refresh stats will access the
entries which are under initialization and it is read only has not pointer chasing so it is safe to do so.

Reviewed By: kagamiori, zacw7

Differential Revision: D67378594

fbshipit-source-id: 38cae1d9204880639da95c8ae9a7bcf37e471262

velox/common/caching/AsyncDataCache.cpp

@@ -518,7 +518,9 @@ void CacheShard::updateStats(CacheStats& stats) {
     if (!entry || !entry->key_.fileNum.hasValue()) {
       ++stats.numEmptyEntries;
       continue;
-    } else if (entry->isExclusive()) {
+    }
+
+    if (entry->isExclusive()) {
       stats.exclusivePinnedBytes +=
           entry->data().byteSize() + entry->tinyData_.capacity();
       ++stats.numExclusive;
@@ -527,10 +529,12 @@ void CacheShard::updateStats(CacheStats& stats) {
           entry->data().byteSize() + entry->tinyData_.capacity();
       ++stats.numShared;
     }
+
     if (entry->isPrefetch_) {
       ++stats.numPrefetch;
       stats.prefetchBytes += entry->size();
     }
+
     ++stats.numEntries;
     stats.tinySize += entry->tinyData_.size();
     stats.tinyPadding += entry->tinyData_.capacity() - entry->tinyData_.size();

velox/common/caching/AsyncDataCache.h

@@ -787,9 +787,15 @@ class AsyncDataCache : public memory::Cache {
   /// Returns true if there is an entry for 'key'. Updates access time.
   bool exists(RawFileCacheKey key) const;
 
+#if defined(__has_feature)
+#if __has_feature(thread_sanitizer)
+  __attribute__((__no_sanitize__("thread")))
+#endif
+#endif
   /// Returns snapshot of the aggregated stats from all shards and the stats of
   /// SSD cache if used.
-  virtual CacheStats refreshStats() const;
+  virtual CacheStats
+  refreshStats() const;
 
   /// If 'details' is true, returns the stats of the backing memory allocator
   /// and ssd cache. Otherwise, only returns the cache stats.