解决gremlin-dirver访问tinkerpop服务器提示序列化错误

解决gremlin-dirver访问tinkerpop服务器提示序列化错误

问题描述

程序集成了gremlin-driver，访问远程tinkerpop服务器，在执行创建节点操作时，返回如下错误栈：

-- ::27.519 ERROR  --- [n-driver-loop-] o.a.t.g.d.Handler$GremlinResponseHandler : Could not process the response

io.netty.handler.codec.DecoderException: org.apache.tinkerpop.gremlin.driver.ser.SerializationException: org.apache.tinkerpop.shaded.kryo.KryoException: Encountered unregistered class ID:
Serialization trace:
id (org.apache.tinkerpop.gremlin.structure.util.detached.DetachedVertexProperty)
    at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:)
    at org.apache.tinkerpop.gremlin.driver.handler.WebSocketClientHandler.channelRead0(WebSocketClientHandler.java:)
    at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:)
    at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:)
    at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:)
    at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:)
    at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:)
    at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:)
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:)
    at io.netty.util.concurrent.SingleThreadEventExecutor$.run(SingleThreadEventExecutor.java:)
    at java.lang.Thread.run(Thread.java:)
Caused by: org.apache.tinkerpop.gremlin.driver.ser.SerializationException: org.apache.tinkerpop.shaded.kryo.KryoException: Encountered unregistered class ID: 

分析

从错误提示中可以猜到是kryo序列化出了问题，在处理vertex时出现了未注册类。这是考虑序列化的原理，kryo将结果从JanusGraph中序列化到Tinkerpop，再通过网络发送到应用，出现未注册类的情况肯定是应用端反序列化时无法找到对应类。因此考虑如何将类注册到kryo中去。

解决：

注册类：org.janusgraph.graphdb.relations.RelationIdentifier到配置文件中去。

hosts: [192.168..xxx]
port:
serializer: { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0, config: { serializeResultToString: false, custom: [org.janusgraph.graphdb.relations.RelationIdentifier] }}