带有ifNotExists的Datastax Cassandra插入

我已经创建了一个键空间

CREATE KEYSPACE xyz WITH replication = {'class': 'NetworkTopologyStrategy', 'DC1': '1', 'datacenter1': '1'}  AND durable_writes = true;

我只有两个节点，DC1和datacenter1节点都已启动。现在，当我试图执行一批insert语句时

Insert insert = QueryBuilder.insertInto(keyspace, table).ifNotExists()
.value("home", fieldsToUpdate.getHome())
.value("subCategoryName", fieldsToUpdate.getSubCategoryName())
.value("id", fieldsToUpdate.getId());
batch.add(insert);
session.execute(batch);

我听到一个例外的说法

Caused by: com.datastax.driver.core.exceptions.UnavailableException: Not enough replica available for query at consistency QUORUM (2 required but only 1 alive)

当我删除.ifNotExists（）时，批处理将毫无例外地执行

使用datastax驱动程序版本2.1.7

我应该如何解决这个问题

编辑： Nodetool状态

abhisheks-MacBook-Pro:bin abhishekagarwal$ sudo ./nodetool status
objc[3398]: Class JavaLaunchHelper is implemented in both /Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/bin/java and /Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/libinstrument.dylib. One of the two will be used. Which one is undefined.
Datacenter: datacenter1
=======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address        Load       Tokens  Owns    Host ID                               Rack
UN  192.168.1.111  19.81 MB   256     ?       f2651124-abdf-486a-a6d7-53327bc2d98c  RAC1
UN  192.168.1.5    5.22 MB    256     ?       d0c72798-1186-4bcb-9e0f-634964a3d083  rack1

Note: Non-system keyspaces don't have the same replication settings, effective ownership information is meaningless

---

问题是您已定义密钥空间，以便在“datacenter1”中保留一个副本，在数据中心“DC1”中保留一个副本。但是您没有名为“DC1”的数据中心，因此如果不存在

子句，则无法在两个数据中心中获得副本的仲裁

因此，您应该这样定义键空间：

CREATE KEYSPACE xyz WITH replication = {'class': 'NetworkTopologyStrategy', 'datacenter1': '1'}

你能显示“nodetool状态”的输出吗。这将有助于诊断问题。