windows-7 – HUnavailableException：可能没有足够的副本来处理

我的DC1中有3个节点,在我的机器上.我只使用一台DC(我的机器).我确实保留了复制因子= 2和“HConsistencyLevel.ONE”.但是,当其中一个节点关闭,并且我尝试读取或写入DB时,我收到错误 – “可能没有足够的副本来处理一致性级别.”.
我的印象是,当我们将一致性级别保持为“ONE”时,即使一个节点启动,写入/读取也应该没有错误.但是我得到了这个错误.有人可以纠正我,因为我在这里做错了.我在谷歌搜索但是没有得到很多关于此错误的帮助,尽管此错误非常相关.我希望在节点发生故障时进行读/写操作.以下是我的代码.

String keySpaceName="kspace";
String clusterName="Test Cluster";
String columFamilyName="ktable";
String host="127.0.0.1:9160,127.0.0.2:9161,127.0.0.3:9162";
int replicationFactor=2;

CassandraHostConfigurator cassandraHostConfigurator = new   
CassandraHostConfigurator(host);
Cluster cluster = HFactory.getOrCreateCluster(clusterName,cassandraHostConfigurator);
KeyspaceDefinition keyspaceDef = cluster.describeKeyspace(keySpaceName);

ConfigurableConsistencyLevel configurableConsistencyLevel = new 
ConfigurableConsistencyLevel();
Map<String,HConsistencyLevel> clmap = new HashMap<String,HConsistencyLevel>();

// Define CL.ONE for ColumnFamily "ktable"
clmap.put(columFamilyName,HConsistencyLevel.ONE);
configurableConsistencyLevel.setReadCfConsistencyLevels(clmap);
configurableConsistencyLevel.setWriteCfConsistencyLevels(clmap);

if(keyspaceDef==null)   
{
KeyspaceDefinition newKeyspace = HFactory.createKeyspaceDefinition(
keySpaceName,ThriftKsDef.DEF_STRATEGY_CLASS,replicationFactor,null);
cluster.addKeyspace(newKeyspace,true);
}
Keyspace keyspace = HFactory.createKeyspace(keySpaceName,cluster,configurableConsistencyLevel);

StringSerializer ss = StringSerializer.get();
ColumnFamilyTemplate<String,String> cft = new ThriftColumnFamilyTemplate<String,String>(keyspace,columFamilyName,ss,ss);
ColumnFamilyUpdater<String,String> updater = cft.createUpdater("xkey");
UUID uid = new UUID();
updater.setValue("id",Long.toString(uid.getClockSeqAndNode()),ss);
updater.setValue("name","Catherine",ss);
updater.setValue("state","GA",ss);
cft.update(updater);