nwangtw commented on a change in pull request #3107: Change concurrent Map
URL: https://github.com/apache/incubator-heron/pull/3107#discussion_r232738669
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File path:
storm-compatibility/src/java/org/apache/storm/metric/api/MultiCountMetric.java
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@@ -36,7 +36,7 @@ public CountMetric scope(String key) {
}
public Object getValueAndReset() {
- Map<String, Object> ret = new HashMap<>();
+ Map<String, Object> ret = new ConcurrentHashMap<>();
Review comment:
HashMap should be good here I think.
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