cccs-jc commented on code in PR #6480:
URL: https://github.com/apache/iceberg/pull/6480#discussion_r1166043802
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spark/v3.3/spark/src/main/java/org/apache/iceberg/spark/source/SparkMicroBatchStream.java:
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@@ -207,7 +207,14 @@ private List<FileScanTask> planFiles(StreamingOffset
startOffset, StreamingOffse
currentOffset = new StreamingOffset(snapshotAfter.snapshotId(), 0L,
false);
}
- if (!shouldProcess(table.snapshot(currentOffset.snapshotId()))) {
+ Snapshot snapshot = table.snapshot(currentOffset.snapshotId());
+
+ if (snapshot == null) {
+ throw new IllegalStateException(
+ String.format("Failed to find expected snapshot %d",
snapshot.snapshotId()));
+ }
+
Review Comment:
agreed, if a snapshot is not found in the table, it's bad. It indicates the
reader's checkpoint is too old. There is no nice way to recover from this,
except clearing your checkpoints and restarting.
this happen to me because I was clearing my snapshots every hour. I realized
then that this made no sense and that I should keep a week of snapshot. Readers
have up to a week to fix any streaming job which went down.
So I'm all good with throwing an exception that points the user to the fact
that the checkpointed snapshot ID is no longer available in the table.
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