nastra commented on code in PR #6757:
URL: https://github.com/apache/iceberg/pull/6757#discussion_r1098466518


##########
api/src/main/java/org/apache/iceberg/catalog/CatalogTransaction.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.iceberg.catalog;
+
+public interface CatalogTransaction {
+
+  enum IsolationLevel {
+
+    /**
+     * Table can change underneath but still have to pass normal table 
validation. Loading table
+     * data when it's referenced.
+     */
+    SNAPSHOT,
+
+    /**
+     * All tables participating in the transaction must be in the same state 
when committing
+     * compared to when the transaction started. Loading table data when it is 
referenced.
+     */
+    SERIALIZABLE_WITH_LOADING_READS,
+
+    /**
+     * All tables participating in the transaction must be in the same state 
when committing
+     * compared to when the transaction started. Loading table data as of TX 
start time.
+     */
+    SERIALIZABLE_WITH_FIXED_READS,
+  }

Review Comment:
   it should actually be most likely at the branch level (but I'd have to 
revisit and think about this). However, I started to work on this before 
writing to branches (#5234) was committed, hence it's not being reflected here.



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