[GitHub] [helix] lei-xia commented on a change in pull request #365: Fix RoutingTableProvider statePropagationLatency metric reporting bug

[GitBox <gi...@apache.org>]

lei-xia commented on a change in pull request #365: Fix RoutingTableProvider statePropagationLatency metric reporting bug
URL: https://github.com/apache/helix/pull/365#discussion_r308355503
 
 

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 File path: helix-core/src/main/java/org/apache/helix/common/caches/CurrentStateCache.java
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 @@ -135,10 +135,15 @@ private void refreshCurrentStatesCache(HelixDataAccessor accessor,
     Set<PropertyKey> cachedKeys = new HashSet<>(_currentStateCache.keySet());
     cachedKeys.retainAll(currentStateKeys);
 
+    List<PropertyKey> reloadKeyList = new ArrayList<>(reloadKeys);
     Map<PropertyKey, CurrentState> newStateCache = Collections.unmodifiableMap(
-        refreshProperties(accessor, new ArrayList<>(reloadKeys), new ArrayList<>(cachedKeys),
+        refreshProperties(accessor, reloadKeyList, new ArrayList<>(cachedKeys),
             _currentStateCache));
 
+    // reloadKeyList is updated by refreshProperties()
+    reloadKeys.clear();
+    reloadKeys.addAll(reloadKeyList);
+
     // if the cache was not initialized, the previous state should not be included in the snapshot
 
 Review comment:
   do we use reloadkeys later in this method?  Why not pass reloadKeyList directly here?

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