xichen01 commented on code in PR #5791:
URL: https://github.com/apache/ozone/pull/5791#discussion_r1479595309


##########
hadoop-ozone/client/src/main/java/org/apache/hadoop/ozone/client/rpc/RpcClient.java:
##########
@@ -2358,7 +2366,7 @@ private KeyOutputStream.Builder createKeyOutputStream(
         .enableUnsafeByteBufferConversion(unsafeByteBufferConversion)
         .setConfig(clientConfig)
         .setAtomicKeyCreation(isS3GRequest.get())
-        .setClientMetrics(clientMetrics)
+        
.setBlockOutPutStreamResourceProvider(blockOutPutStreamResourceProvider)

Review Comment:
   I noticed that the closure accesses a lot of external variables, which could 
be a potential thread-safety issue, so I just added a "big" `synchronized` 
here, which ensures that even if someone changes the code later on, there's 
probably no thread-safety issue, and the `thenApplyAsync` just sets/creates the 
variable, which is supposed to be lightweight.
   So, I think the current approach is acceptable, what do you think?



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