我们使用数据堆栈 Java 驱动程序 （v3.6.0） 连接到卡桑德拉 （v3.11）。每当我们的基础设施团队关闭节点上的Cassandra时（逐个节点地修补操作系统），我们的查询就会保持正常运行。但是，我们确实在日志中看到了很多由数据堆栈驱动程序中的 NullPointers 导致的错误：Error parsing schema from Cassandra system tables: the schema in Cluster#getMetadata() will appear incomplete or stalejava.lang.NullPointerException: null at c.d.d.mapping.MappingManager$1.onTableChanged(MappingManager.java:160) at c.d.driver.core.Metadata.triggerOnTableChanged(Metadata.java:696) at c.d.driver.core.SchemaParser.updateTables(SchemaParser.java:484) at c.d.driver.core.SchemaParser.refresh(SchemaParser.java:130) at c.d.d.core.ControlConnection.refreshSchema(ControlConnection.java:408) at c.d.d.core.ControlConnection.refreshSchema(ControlConnection.java:354) at c.d.d.c.Cluster$Manager$SchemaRefreshRequestDeliveryCallback$1.runMayThrow(Cluster.java:2867) at c.d.d.c.ExceptionCatchingRunnable.run(ExceptionCatchingRunnable.java:32) at j.u.c.Executors$RunnableAdapter.call(Executors.java:511) at c.g.c.u.c.TrustedListenableFutureTask$TrustedFutureInterruptibleTask.runInterruptibly(TrustedListenableFutureTask.java:111) at c.g.c.u.c.InterruptibleTask.run(InterruptibleTask.java:58) at c.g.c.u.c.TrustedListenableFutureTask.run(TrustedListenableFutureTask.java:75) at j.u.c.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at j.u.c.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at i.n.u.c.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) at java.lang.Thread.run(Thread.java:748)这看起来有人熟悉吗？在谷歌搜索这个问题时，我找不到太多，所以我想知道我们是否做错了什么，或者这是一个已知的问题......
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