java - Cassandra java驱动程序连接错误

Question

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。它最初连接并执行良好，然后突然在某个时刻失去连接并且不重新连接 - 此时所有查询都会失败。

更多信息-

所以我在 CentOS 上运行 DataStax cassandra 2.1 3 个节点集群，我使用 DataStax cassandra 驱动程序 3.0.0。在过去的几个月里，一切都进展顺利，最近 iv'e 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)和查询数量的增加。此时开始断开连接。

因此，当我的应用程序启动时，它会连接到集群并保存单个集群(和 session )对象，如下面的代码片段所示，此时一切顺利。几个小时后，我开始收到执行的每个查询的 NoHostAvailableException 。此时，我的其他服务器在同一个 cassandra 集群上运行良好，所以我知道集群本身没有任何问题。当我重新启动服务器时，一切都恢复正常。

经过更多调查后，当问题开始发生时，我发现两个节点都没有 Activity 连接。我将驱动程序设置为以DEBUG 级别登录到专用日志文件中，并等待问题再次出现。几个小时后，问题再次发生，在某个时刻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

之后您会看到以下内容:

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

从此时起，您只会看到超时和重试，但不会重新建立连接。

// 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);

Answer 1

这可能是 java 驱动程序中的错误

If a cassandra node is configured with native_transport_max_frame_size_in_mb > 256 and the driver reads a frame larger than 256mb it throws an exception: This breaks the drivers ability to read subsequent packets since the Decoder for parsing frames is static

这已在 3.0.4 中修复，这是详细信息的链接。

https://datastax-oss.atlassian.net/browse/JAVA-1292

您可以尝试升级您的驱动程序吗？