[FLINK-35813][runtime] Do not clear state
field in TSO until operator was closed
#3469
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This closes FLINK-35813.
Currently, transform schema operator clears its state field after its
finish
method was called. However, checkpoints / savepoints could be triggered betweenfinish
andclose
, and any following checkpoint requests in snapshotState method will cause an NPE.For example, with a bounded pipeline job like this:
would cause null pointer exception after job finishes:
By postponing clearing
state
toclose()
should resolve this problem.