这个日志看起来是 driver 端的日志，spark executor 的日志是否有呢。
driver 端打印的日志是重试失败后，打印了最后一次的失败原因
Caused by: com.pingcap.tikv.exception.GrpcException: retry is exhausted.
at com.pingcap.tikv.util.ConcreteBackOffer.doBackOffWithMaxSleep(ConcreteBackOffer.java:153)
at com.pingcap.tikv.util.ConcreteBackOffer.doBackOff(ConcreteBackOffer.java:124)
at com.pingcap.tikv.region.RegionStoreClient.handleCopResponse(RegionStoreClient.java:709)
at com.pingcap.tikv.region.RegionStoreClient.coprocess(RegionStoreClient.java:681)
at com.pingcap.tikv.operation.iterator.DAGIterator.process(DAGIterator.java:220)
… 7 more
Caused by: com.pingcap.tikv.exception.GrpcException: message: “region 12189882 is missing”
region_not_found {
region_id: 12189882
}
中间重试失败的细节应该会在 spark executor 日志中