Zakelly commented on a change in pull request #16341:
URL: https://github.com/apache/flink/pull/16341#discussion_r663632802



##########
File path: 
flink-core/src/main/java/org/apache/flink/configuration/CheckpointingOptions.java
##########
@@ -114,6 +114,25 @@
                                     + "if no value set (job or cluster), the 
change log will not be "
                                     + "enabled.");
 
+    /** Which storage to use to store state changelog. */
+    @Documentation.Section(value = 
Documentation.Sections.COMMON_STATE_BACKENDS)
+    public static final ConfigOption<String> STATE_CHANGE_LOG_STORAGE =
+            ConfigOptions.key("state.backend.changelog.storage")
+                    .stringType()
+                    .defaultValue("memory")

Review comment:
       This also makes ```flink_core``` depend on the ```flink_runtime```.
   I leave it and add some javadoc.
   
   WDYT?




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