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[SPARK-17022][YARN] Handle potential deadlock in driver handling mess…
…ages ## What changes were proposed in this pull request? We directly send RequestExecutors to AM instead of transfer it to yarnShedulerBackend first, to avoid potential deadlock. ## How was this patch tested? manual tests Author: WangTaoTheTonic <wangtao111@huawei.com> Closes #14605 from WangTaoTheTonic/lock.
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