Datastax卡桑德拉插入与ifNotExists

Question

我创建了一个密钥空间

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

我只有两个节点，都DC1以及datacenter1节点都已启动。现在，当我试图执行批量插入语句

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); 

我得到一个异常说

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（）第一批执行没有任何异常。

使用datastax驱动程序版本2.1.7。

我应该怎么做来解决这个问题？

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 

Answer 1

问题是你已经定义了密钥空间，以保持“datacenter1”一个副本，在数据中心的一个副本“DC1”。但是您没有一个名为'DC1'的数据中心，因此无法在if not exists子句的两个数据中心中获得法定数量的复制副本。

所以，你应该已经定义了密钥空间是这样的：

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