stevenzwu commented on code in PR #5873:
URL: https://github.com/apache/iceberg/pull/5873#discussion_r982724320
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flink/v1.14/flink/src/main/java/org/apache/iceberg/flink/sink/IcebergFilesCommitter.java:
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@@ -156,7 +156,18 @@ public void initializeState(StateInitializationContext
context) throws Exception
this.checkpointsState =
context.getOperatorStateStore().getListState(STATE_DESCRIPTOR);
this.jobIdState =
context.getOperatorStateStore().getListState(JOB_ID_DESCRIPTOR);
if (context.isRestored()) {
- String restoredFlinkJobId = jobIdState.get().iterator().next();
+ Iterable<String> jobIdIterable = jobIdState.get();
+ if (jobIdIterable == null || !jobIdIterable.iterator().hasNext()) {
+ LOG.warn(
+ "Failed to restore committer state. This can happen when operator
uid changed and Flink "
+ + "allowNonRestoredState is enabled. Best practice is to
explicitly set the operator id "
+ + "via FlinkSink#Builder#uidPrefix() so that the committer
operator uid is stable. "
+ + "Otherwise, Flink auto generate an operator uid based on job
topology."
+ + "With that, operator uid is subjective to change upon
topology change.");
+ return;
+ }
+
+ String restoredFlinkJobId = jobIdIterable.iterator().next();
Preconditions.checkState(
Review Comment:
thx, I would keep this Preconditions check. it should never happen unless
there is some code bug or unforeseen weird bug.
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