Cassandra java驱动程序连接错误

TL; DR - 所以我遇到了从DataStax java cassandra驱动程序到DataStax cassandra集群的连接问题 . 它最初连接并运行良好，然后突然在某些时候它失去连接并且不重新连接 - 此时所有查询都失败了 .

更多信息 -

所以我在CentOS上运行3个节点的DataStax cassandra 2.1集群，我正在使用DataStax cassandra驱动程序3.0.0 . 在过去的几个月里，一切都运行良好，最近我们部署了一些代码更改，其中包括一些架构更改（即向现有表添加列）以及查询数量的增加 . 此时已开始断开连接 .

因此，当我的应用程序启动时，它连接到群集并保存一个群集（和会话）对象，如下面的代码片段所示，此时一切顺利 . 几个小时后，我开始接收每个查询的 NoHostAvailableException . 在这一点上，我有其他服务器在相同的cassandra集群中表现良好，所以我知道集群本身没有任何问题 . 当我重新启动我的服务器时，一切都很好 .

在调查了一点之后，当问题开始发生时，我看到's no active connection to neither node. Iv' e设置驱动程序以登录 DEBUG 级别进入专用日志文件并等待问题再次出现 . 几个小时后问题再次发生，在某些时候日志文件显示以下消息：

Connection[/10.4.116.91:9042-1, inFlight=2, closed=false] connection error
io.netty.handler.codec.DecoderException: com.datastax.driver.core.exceptions.DriverInternalError: Adjusted frame length exceeds 268435456: 326843398 - discarded
        at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:418)
        at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:245)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:292)
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:278)
        at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:962)
        at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
        at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:528)
        at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:485)
        at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:399)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:371)
        at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112)
        at java.lang.Thread.run(Thread.java:745)
Caused by: com.datastax.driver.core.exceptions.DriverInternalError: Adjusted frame length exceeds 268435456: 326843398 - discarded
        at com.datastax.driver.core.Frame$Decoder$DecoderForStreamIdSize.decode(Frame.java:239)
        at com.datastax.driver.core.Frame$Decoder.decode(Frame.java:205)
        at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:387)
        ... 11 common frames omitted

在那之后，你看到了这个：

Connection[/10.4.116.91:9042-1, inFlight=2, closed=false] connection error
io.netty.handler.codec.DecoderException: com.datastax.driver.core.exceptions.DriverInternalError: Adjusted frame length exceeds 268435456: 326843398 - discarded
        at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:418)
        at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:245)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:292)
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:278)
        at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:962)
        at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
        at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:528)
        at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:485)
        at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:399)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:371)
        at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112)
        at java.lang.Thread.run(Thread.java:745)
Caused by: com.datastax.driver.core.exceptions.DriverInternalError: Adjusted frame length exceeds 268435456: 326843398 - discarded
        at com.datastax.driver.core.Frame$Decoder$DecoderForStreamIdSize.decode(Frame.java:239)
        at com.datastax.driver.core.Frame$Decoder.decode(Frame.java:205)
        at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:387)
        ... 11 common frames omitted

从这一点开始，您只能看到超时和重试，但连接不会重新 Build .

// CREATION OF CASSANDRA SESSION
PoolingOptions poolingOptions = new PoolingOptions();
poolingOptions
    .setPoolTimeoutMillis(0)
    .setMaxRequestsPerConnection(HostDistance.LOCAL, 32768)
    .setMaxRequestsPerConnection(HostDistance.REMOTE, 2000);
cluster = builder.withPoolingOptions(poolingOptions).build();
cluster.getConfiguration().getCodecRegistry().register(new EnumNameCodec<>(OnBoardingSlide.Type.class));
session = cluster.connect(Global.getServerConfig().CASSANDRA_KEYSPACE_NAME);