dferstay commented on a change in pull request #684:
URL: https://github.com/apache/pulsar-client-go/pull/684#discussion_r775296098



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File path: pulsar/default_router.go
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@@ -30,6 +31,7 @@ type defaultRouter struct {
        lastChangeTimestamp int64
        msgCounter          uint32
        cumulativeBatchSize uint32
+       sync.RWMutex

Review comment:
       Actually, I'm concerned that the use of a mutex will incur overhead and 
affect performance, especially under concurrent publishing.  I've added a bench 
test to get quantitative numbers in 
https://github.com/apache/pulsar-client-go/pull/693 




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