jolshan commented on code in PR #13231:
URL: https://github.com/apache/kafka/pull/13231#discussion_r1107757784


##########
clients/src/main/resources/common/message/AddPartitionsToTxnResponse.json:
##########
@@ -22,22 +22,35 @@
   // Version 2 adds the support for new error code PRODUCER_FENCED.
   //
   // Version 3 enables flexible versions.
-  "validVersions": "0-3",
+  //
+  // Version 4 adds support to batch multiple transactions.
+  "validVersions": "0-4",
   "flexibleVersions": "3+",
   "fields": [
     { "name": "ThrottleTimeMs", "type": "int32", "versions": "0+",
       "about": "Duration in milliseconds for which the request was throttled 
due to a quota violation, or zero if the request did not violate any quota." },
-    { "name": "Results", "type": "[]AddPartitionsToTxnTopicResult", 
"versions": "0+",
-      "about": "The results for each topic.", "fields": [
+    { "name": "ResultsByTransaction", "type": "[]AddPartitionsToTxnResult", 
"versions": "4+",
+      "about": "Results categorized by transactional ID.", "fields": [
+      { "name": "TransactionalId", "type": "string", "versions": "4+", 
"mapKey": true, "entityType": "transactionalId",
+        "about": "The transactional id corresponding to the transaction."},
+      { "name": "TopicResults", "type": "[]AddPartitionsToTxnTopicResult", 
"versions": "4+",
+        "about": "The results for each topic." }
+    ]},
+    { "name": "Results", "type": "[]AddPartitionsToTxnTopicResult", 
"versions": "0-3",

Review Comment:
   That's fair. We've done something similar in the past.



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