jiajunwang commented on a change in pull request #365: Fix RoutingTableProvider
statePropagationLatency metric reporting bug
URL: https://github.com/apache/helix/pull/365#discussion_r308548892
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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:
IMHO, refreshProperties needs to be improved. The main issue is that the
function takes one parameter as the input and also the output.
Ideally, we shall have 2 separate list/set. One for the input, which keys
require reload. The other for the output, read the real reloaded keys.
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