dajac commented on code in PR #13231:
URL: https://github.com/apache/kafka/pull/13231#discussion_r1110062885


##########
clients/src/main/resources/common/message/AddPartitionsToTxnRequest.json:
##########
@@ -23,17 +23,35 @@
   // Version 2 adds the support for new error code PRODUCER_FENCED.
   //
   // Version 3 enables flexible versions.
-  "validVersions": "0-3",
+  //
+  // Version 4 adds VerifyOnly field to check if partitions are already in 
transaction and adds support to batch multiple transactions.
+  "validVersions": "0-4",
   "flexibleVersions": "3+",
   "fields": [
-    { "name": "TransactionalId", "type": "string", "versions": "0+", 
"entityType": "transactionalId",
+    { "name": "VerifyOnly", "type": "bool", "versions": "4+", "default": false,

Review Comment:
   I was wondering if having `VerifyOnly` as top level field is the right thing 
to do. It basically means that we cannot batch transactions with 
`VerifyOnly=true` and transactions with `VerifyOnly=false` in the same request. 
This may impact out batching mechanism. Thoughts?



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