gaodayue commented on a change in pull request #6402: Thread-safe QueryMetrics
URL: https://github.com/apache/incubator-druid/pull/6402#discussion_r227255825
 
 

 ##########
 File path: processing/src/main/java/org/apache/druid/query/QueryMetrics.java
 ##########
 @@ -92,7 +94,7 @@
  * 100% guarantee of compatibility, because methods could not only be added to 
QueryMetrics, existing methods could also
  * be changed or removed.
  *
- * <p>QueryMetrics is designed for use from a single thread, implementations 
shouldn't care about thread-safety.
+ * <p><b>All implementations of QueryMetrics should be Thread-safe.</b>
  *
  *
  * Adding new methods to QueryMetrics
 
 Review comment:
   If needed, we can do the renaming in a separate PR. I want to keep this PR 
small and easy to review. 

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