[Flink] Fix SystemTableSource unordered flag for bucket-unaware system talbes#7434
Merged
JingsongLi merged 2 commits intoapache:masterfrom Mar 17, 2026
Merged
[Flink] Fix SystemTableSource unordered flag for bucket-unaware system talbes#7434JingsongLi merged 2 commits intoapache:masterfrom
JingsongLi merged 2 commits intoapache:masterfrom
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Purpose
Linked issue: close #7326
Previously, SystemTableSource always passed unordered=false when creating
ContinuousFileStoreSource, causing PreAssignSplitAssigner to assign all
splits to a single subtask for bucket=-1 (BUCKET_UNAWARE) tables. This
resulted in severe data skew where only one subtask received all records.
Fix this by introducing isUnordered() to derive the correct value from
the underlying table's bucket configuration, consistent with the logic
in FlinkSourceBuilder. For BUCKET_UNAWARE tables (bucket=-1), unordered
is set to true so FIFOSplitAssigner distributes splits across all tasks.
Tests
Ci