artemlivshits commented on code in PR #18810:
URL: https://github.com/apache/kafka/pull/18810#discussion_r1945295252


##########
transaction-coordinator/src/main/java/org/apache/kafka/coordinator/transaction/AddPartitionsToTxnConfig.java:
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@@ -0,0 +1,73 @@
+/*
+ * 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;
+
+/*
+ * 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.
+ */
+
+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;

Review Comment:
   The timeout should be small enough to not exceed client request timeout 
(which is controlled by the client, so we cannot make assumptions on the 
broker), large enough to be longer than a typical time to commit transaction, 
large enough to not add latency to overall call by making the client retry (the 
default client backoff is 100ms, so for an outlier case where transaction 
couldn't complete in 100ms it seems ok if the client does another 100ms 
backoff).
   
   Setting to 0 will effectively turn off the retries on the broker.



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