DanielLeens commented on issue #12116:
URL: https://github.com/apache/seatunnel/issues/12116#issuecomment-5552994705

   Supporting evidence from the Flink translation layer (`dev`, 
`seatunnel-translation-flink-common/.../sink/FlinkSink.java` lines 78–88): 
`FlinkSink#createWriter` wraps `sink.createWriter(stContext)` in one 
`FlinkSinkWriter` per Flink subtask, with no per-table routing at that level — 
so every `AssertSinkWriter` instance in a Flink TaskManager receives whatever 
rows reach its subtask and accumulates into the same static 
`LONG_ACCUMULATOR`/`TABLE_NAMES`, then evaluates its rules in its own 
`close()`. Under Zeta each job has its own classloader, so the statics are 
effectively isolated there, which is why only Flink legs fail. Reproduction 
count so far on the same dev test: PR #11458 (Flink 1.18.0: 97/125/150), #11077 
(Flink 1.15.3: 75/125/150), #11503 (Flink 1.15.3 + one more Flink leg: 
87/125/150).


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