KAFKA-12464: enhance constrained sticky Assign algorithm#10509

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ableegoldman merged 5 commits intoapache:trunkfrom

showuon:KAFKA-12464

May 6, 2021

Commits on Apr 12, 2021

KAFKA-12464: enhance constrained sticky Assign algorithm
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Commits on Apr 20, 2021

KAFKA-12464: improve performance by using ArrayList adding instead of removing
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Commits on Apr 29, 2021

KAFKA-12464: remove sortedAllPartitions to save memory and refactor codes
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Commits on May 4, 2021

KAFKA-12464: refactor codes and add more tests
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Commits on May 5, 2021

KAFKA-12464: verifyValidityAndBalance before verifying assignment for cooperative protocol
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