klion26 commented on code in PR #21053:
URL: https://github.com/apache/flink/pull/21053#discussion_r1004561770
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flink-runtime/src/main/java/org/apache/flink/runtime/checkpoint/CompletedCheckpointStore.java:
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@@ -39,6 +40,16 @@ public interface CompletedCheckpointStore {
* <p>Only a bounded number of checkpoints is kept. When exceeding the
maximum number of
* retained checkpoints, the oldest one will be discarded.
*
+ * <p>After <a
href="https://issues.apache.org/jira/browse/FLINK-24611";>FLINK-24611</a>, {@link
+ * SharedStateRegistry#unregisterUnusedState} should be called here to
subsume unused state.
+ * <font color="#FF0000"><strong>Note</strong></font>, the {@link
CompletedCheckpoint} passed to
+ * {@link SharedStateRegistry#registerAllAfterRestored} or {@link
+ * SharedStateRegistryFactory#create} must be the same object as the input
parameter, otherwise
+ * the state may be deleted by mistake.
+ *
+ * <p>After <a
href="https://issues.apache.org/jira/browse/FLINK-24611";>FLINK-25872</a>, {@link
Review Comment:
https://issues.apache.org/jira/browse/FLINK-24611 ->
https://issues.apache.org/jira/browse/FLINK-25872
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