[GitHub] [iceberg] Reo-LEI commented on a change in pull request #3103: Flink: IcebergFilesCommitter validate dataFile exist start from last committed snapshot.

[GitBox <gi...@apache.org>]

Reo-LEI commented on a change in pull request #3103:
URL: https://github.com/apache/iceberg/pull/3103#discussion_r716338791



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File path: flink/src/main/java/org/apache/iceberg/flink/sink/IcebergFilesCommitter.java
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@@ -283,6 +287,7 @@ private void commitDeltaTxn(NavigableMap<Long, WriteResult> pendingResults, Stri
         // merged one will lead to the incorrect delete semantic.
         WriteResult result = e.getValue();
         RowDelta rowDelta = table.newRowDelta()
+            .validateFromSnapshot(lastCommittedSnapshotId)

Review comment:
       As I listed in https://github.com/apache/iceberg/pull/2867, restart or restore from checkpoint/savepoint, the `lastCommittedSnapshotId` will just simply reset to null, and `rowDelta` will travel all snapshot history to ensure data files still exist and guarantee all snapshot history are valid. If we delete the expired snapshots by maintenance procedure before restoring the job, the validation will travel to the snapshot which is commited by expire snapshot maintenance procedure. I think that whould be ok.
   
   This optimization just trying to speed up commit result in runtime, and I want to keep it simple, so I think we don't need to save the `lastCommittedSnapshotId` and restore it from checkpoint/savepoint. but I want to hear @openinx @jackye1995 @stevenzwu @kbendick opinions.




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