我已经将带有2个节点的dse集群从5.0.7升级到6.7.3。使用nodetool升级后，状态显示两个节点都“正常运行”，每个节点上的负载约为75 gb，并且集群适用于具有读写功能的应用程序。但是在这个过程中出错了
nodetool repair-pr some repair失败
升级sstable会导致节点关闭。
并在system.log文件中每隔10秒观察一次异常

WARN  [OptionalTasks:1] 2019-07-18 08:20:14,495  CassandraRoleManager.java:386 - CassandraRoleManager skipped default role setup: some nodes were not ready
INFO  [OptionalTasks:1] 2019-07-18 08:20:14,495  CassandraRoleManager.java:432 - Setup task failed with error, rescheduling
org.apache.cassandra.exceptions.UnavailableException: Cannot achieve consistency level ONE
        at org.apache.cassandra.db.ConsistencyLevel.assureSufficientLiveNodes(ConsistencyLevel.java:392)
        at org.apache.cassandra.service.AbstractReadExecutor.getReadExecutor(AbstractReadExecutor.java:214)
        at org.apache.cassandra.service.AbstractReadExecutor.getReadExecutor(AbstractReadExecutor.java:190)
        at org.apache.cassandra.service.StorageProxy$SinglePartitionReadLifecycle.<init>(StorageProxy.java:1541)
        at org.apache.cassandra.service.StorageProxy.fetchRows(StorageProxy.java:1524)
        at org.apache.cassandra.service.StorageProxy.readRegular(StorageProxy.java:1447)
        at org.apache.cassandra.service.StorageProxy.read(StorageProxy.java:1325)
        at org.apache.cassandra.db.SinglePartitionReadCommand$Group.execute(SinglePartitionReadCommand.java:1274)
        at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:366)
        at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:574)
        at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:307)
        at org.apache.cassandra.cql3.QueryProcessor.lambda$processStatement$4(QueryProcessor.java:256)
        at io.reactivex.internal.operators.single.SingleDefer.subscribeActual(SingleDefer.java:36)
        at io.reactivex.Single.subscribe(Single.java:2700)
        at io.reactivex.internal.operators.single.SingleMap.subscribeActual(SingleMap.java:34)
        at io.reactivex.Single.subscribe(Single.java:2700)
        at io.reactivex.Single.blockingGet(Single.java:2153)
        at org.apache.cassandra.concurrent.TPCUtils.blockingGet(TPCUtils.java:75)
        at org.apache.cassandra.cql3.QueryProcessor.processBlocking(QueryProcessor.java:352)
        at org.apache.cassandra.auth.CassandraRoleManager.hasExistingRoles(CassandraRoleManager.java:396)
        at org.apache.cassandra.auth.CassandraRoleManager.setupDefaultRole(CassandraRoleManager.java:370)
        at org.apache.cassandra.auth.CassandraRoleManager.doSetupDefaultRole(CassandraRoleManager.java:428)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at org.apache.cassandra.concurrent.NamedThreadFactory.lambda$threadLocalDeallocator$0(NamedThreadFactory.java:79)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.lang.Thread.run(Thread.java:748)