pvary commented on code in PR #16011:
URL: https://github.com/apache/iceberg/pull/16011#discussion_r3110398215


##########
flink/v1.20/flink/src/main/java/org/apache/iceberg/flink/sink/dynamic/DynamicWriteResultAggregator.java:
##########
@@ -76,10 +86,29 @@ class DynamicWriteResultAggregator
     this.cacheMaximumSize = cacheMaximumSize;
   }
 
+  @Override
+  public void initializeState(StateInitializationContext context) throws 
Exception {
+    super.initializeState(context);
+    this.jobIdState = 
context.getOperatorStateStore().getListState(JOB_ID_DESCRIPTOR);
+    Iterable<String> restoredJobIds = jobIdState.get();
+    if (restoredJobIds != null && restoredJobIds.iterator().hasNext()) {
+      String restoredJobId = restoredJobIds.iterator().next();
+      if (restoredJobId != null && !restoredJobId.isEmpty()) {
+        this.flinkJobId = restoredJobId;
+        LOG.info(
+            "Restored aggregator flink job id {} from operator state. 
Subsequent committables will"
+                + " be stamped with this id to keep DynamicCommitter dedup 
stable across restarts.",
+            restoredJobId);
+      }
+    }
+  }
+
   @Override
   public void open() throws Exception {
-    this.flinkJobId = 
getContainingTask().getEnvironment().getJobID().toString();
-    this.operatorId = getOperatorID().toString();
+    if (this.flinkJobId == null) {

Review Comment:
   could we do this in the `initializeState`?



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