Question

我有一个复制系数为2的键空间。我正在使用单个实例集群。

我正在尝试使用“如果不存在”选项将值插入该键空间中的表，并出现错误。

在不带“如果不存在”的情况下使用时，将创建该行。

来自cli：

insert into domains (domain, time) values ('test.com', 10) if not exists;

我得到：NoHostAvailable：

从Java客户端运行会产生以下错误：

at org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:720) Caused by: com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (tried: cassandra-service/10.23.251.29:9042 (com.datastax.driver.core.exceptions.UnavailableException: Not enough replicas available for query
at consistency QUORUM (2 required but only 1 alive)))
at com.datastax.driver.core.RequestHandler.reportNoMoreHosts(RequestHandler.java:223)
at com.datastax.driver.core.RequestHandler.access$1200(RequestHandler.java:41)
at com.datastax.driver.core.RequestHandler$SpeculativeExecution.findNextHostAndQuery(RequestHandler.java:309)
at com.datastax.driver.core.RequestHandler$SpeculativeExecution.retry(RequestHandler.java:477)
at com.datastax.driver.core.RequestHandler$SpeculativeExecution.processRetryDecision(RequestHandler.java:455)
at com.datastax.driver.core.RequestHandler$SpeculativeExecution.onSet(RequestHandler.java:686)
at com.datastax.driver.core.Connection$Dispatcher.channelRead0(Connection.java:1091)
at com.datastax.driver.core.Connection$Dispatcher.channelRead0(Connection.java:1008)
at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:287)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:310)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:284)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)
at com.datastax.driver.core.InboundTrafficMeter.channelRead(InboundTrafficMeter.java:29)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1273)
at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1084)
at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:489)
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:428)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:265)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1334)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:926)
at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:979)
at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:401)
at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:306)
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138)
at java.lang.Thread.run(Thread.java:748)

Answer 1

在单节点群集上不能具有复制因子2-LWT（轻量级事务，例如QUORUM需要仲裁或需要足够数量节点的本地仲裁！请更改复制因子，或添加另一个节点。 / p>

但是复制因子2加this.state.并不是很好的解决方案-这意味着您无法关闭任何节点，否则您的事务将失败。

cassandra错误-“如果不存在”失败，复制因子为2

1 个答案: