cherry pick pingcap#19198 to release-4.0

Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
ti-srebot · Aug 21, 2020 · 358a9c6 · 358a9c6
1 parent fb95293
commit 358a9c6
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/store/tikv/region_cache.go b/store/tikv/region_cache.go
@@ -839,7 +839,7 @@ func (c *RegionCache) insertRegionToCache(cachedRegion *Region) {
 	if old != nil {
 		// Don't refresh TiFlash work idx for region. Otherwise, it will always goto a invalid store which
 		// is under transferring regions.
-		cachedRegion.getStore().workTiFlashIdx = old.(*btreeItem).cachedRegion.getStore().workTiFlashIdx
+		atomic.StoreInt32(&cachedRegion.getStore().workTiFlashIdx, atomic.LoadInt32(&old.(*btreeItem).cachedRegion.getStore().workTiFlashIdx))
 		delete(c.mu.regions, old.(*btreeItem).cachedRegion.VerID())
 	}
 	c.mu.regions[cachedRegion.VerID()] = cachedRegion