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完整的报错信息：
org.apache.flink.runtime.jobmanager.scheduler.NoResourceAvailableException: Could not allocate all requires slots within timeout of 300000 ms. Slots required: 3, slots allocated: 1, previous allocation...
没有资源可用，原因就是：项目设置的并行度大于集群的 slot 个数，导致抢夺资源，直到超时。要么增加 slot 个数，要么减少 Parallelism 个数。
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