KAFKA-8620: fix NPE due to race condition during shutdown while rebalancing#7021

Merged

mjsax merged 10 commits into

apache:trunkfrom

abbccdda:system_test_fix

Jul 15, 2019

Commits on Jul 3, 2019

fix the state after poll request
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add unit test
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Commits on Jul 7, 2019

trying to find a way to pass assignment in
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Commits on Jul 8, 2019

minor fix
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Commits on Jul 9, 2019

address comments
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success reproduce
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address minor suggestion
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avoid info exposure of internal implementation
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Commits on Jul 10, 2019

address comments by initializing real task manager and one-time mock consumer
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address Bruno's comment
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