jolshan commented on code in PR #18810:
URL: https://github.com/apache/kafka/pull/18810#discussion_r1945245279


##########
transaction-coordinator/src/main/java/org/apache/kafka/coordinator/transaction/AddPartitionsToTxnConfig.java:
##########
@@ -0,0 +1,56 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.kafka.coordinator.transaction;
+
+import org.apache.kafka.common.config.AbstractConfig;
+import org.apache.kafka.common.config.ConfigDef;
+
+import static org.apache.kafka.common.config.ConfigDef.Importance.HIGH;
+import static org.apache.kafka.common.config.ConfigDef.Range.atLeast;
+import static org.apache.kafka.common.config.ConfigDef.Type.INT;
+
+public final class AddPartitionsToTxnConfig {
+    // The default config values for the server-side add partition to 
transaction operations.
+    public static final String ADD_PARTITIONS_TO_TXN_MAX_TIMEOUT_MS_CONFIG = 
"add.partitions.to.txn.max.timeout.ms";
+    public static final int ADD_PARTITIONS_TO_TXN_MAX_TIMEOUT_MS_DEFAULT = 100;
+    public static final String ADD_PARTITIONS_TO_TXN_MAX_TIMEOUT_MS_DOC = "The 
maximum allowed timeout for server side " +
+            "on adding partitions to transactions. It applies to both the 
verification and actual add partition operations." +
+            "It will not be effective if it is larger than request.timeout.ms";
+    public static final String ADD_PARTITIONS_TO_TXN_RETRY_BACKOFF_MS_CONFIG = 
"add.partitions.to.txn.retry.backoff.ms";
+    public static final int ADD_PARTITIONS_TO_TXN_RETRY_BACKOFF_MS_DEFAULT = 
20;
+    public static final String ADD_PARTITIONS_TO_TXN_RETRY_BACKOFF_MS_DOC = 
"The retry backoff when the server attempts" +

Review Comment:
   nit: should we just mention this is a server-side backoff?



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