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gremlin - 更改 gremlin 服务器中的默认序列化以使用 GraphSON V1

问题描述

我正在尝试将 Gremlin http 服务器的输出格式更改为非类型化 JSON 对象，如下所示。

{
  "requestId": "320599c8-7d49-4cc6-87a6-42115009f90c",
  "status": {
    "message": "",
    "code": 200,
    "attributes": {}
  },
  "result": {
    "data": [
      {
        "info": [
          {
            "total_seen": [
              2845
            ],
            "first_seen": [
              1501568446000
            ],
            "last_seen": [
              1580157081000
            ],
            "value": [
              "http://test.com"
            ]
          }
        ]
      }
    ],
    "meta": {}
  }
}

但是我从服务器得到的响应是输入的

{
  "requestId": "e8621470-7ee7-4f6b-a8ea-1d49c85093c8",
  "status": {
    "message": "",
    "code": 200,
    "attributes": {
      "@type": "g:Map",
      "@value": []
    }
  },
  "result": {
    "data": {
      "@type": "g:List",
      "@value": [
        {
          "@type": "g:Map",
          "@value": [
            "info",
            {
              "@type": "g:List",
              "@value": [
                {
                  "@type": "g:Map",
                  "@value": [
                    "total_seen",
                    {
                      "@type": "g:List",
                      "@value": [
                        {
                          "@type": "g:Int32",
                          "@value": 2797
                        }
                      ]
                    },
                    "first_seen",
                    {
                      "@type": "g:List",
                      "@value": [
                        {
                          "@type": "g:Int64",
                          "@value": 1501568446000
                        }
                      ]
                    },
                    "last_seen",
                    {
                      "@type": "g:List",
                      "@value": [
                        {
                          "@type": "g:Int64",
                          "@value": 1578774368000
                        }
                      ]
                    },
                    "vertex_type",
                    {
                      "@type": "g:List",
                      "@value": [
                        "url"
                      ]
                    },
                    "url_value",
                    {
                      "@type": "g:List",
                      "@value": [
                        "http://test.com"
                      ]
                    }
                  ]
                }
              ]
            }
          ]
        }
      ]
    },
    "meta": {
      "@type": "g:Map",
      "@value": []
    }
  }
}

我尝试通过评论 GraphSON V2 和 V3 来更改 gremlin-server.yaml 中的设置

# Copyright 2019 JanusGraph Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

host: 127.0.0.1
port: 8182
scriptEvaluationTimeout: 30000
channelizer: org.apache.tinkerpop.gremlin.server.channel.WebSocketChannelizer
graphs: {
  graph: conf/gremlin-server/janusgraph-cassandra-es-server.properties
}
scriptEngines: {
  gremlin-groovy: {
    plugins: { org.janusgraph.graphdb.tinkerpop.plugin.JanusGraphGremlinPlugin: {},
               org.apache.tinkerpop.gremlin.server.jsr223.GremlinServerGremlinPlugin: {},
               org.apache.tinkerpop.gremlin.tinkergraph.jsr223.TinkerGraphGremlinPlugin: {},
               org.apache.tinkerpop.gremlin.jsr223.ImportGremlinPlugin: {classImports: [java.lang.Math], methodImports: [java.lang.Math#*]},
               org.apache.tinkerpop.gremlin.jsr223.ScriptFileGremlinPlugin: {files: [scripts/empty-sample.groovy]}}}}
serializers:
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0, config: { serializeResultToString: true }}
#  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV3d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
  # Older serialization versions for backwards compatibility:
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoLiteMessageSerializerV1d0, config: {ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0, config: { serializeResultToString: true }}
#  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerGremlinV2d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerGremlinV1d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistryV1d0] }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV1d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistryV1d0] }}
processors:
  - { className: org.apache.tinkerpop.gremlin.server.op.session.SessionOpProcessor, config: { sessionTimeout: 28800000 }}
  - { className: org.apache.tinkerpop.gremlin.server.op.traversal.TraversalOpProcessor, config: { cacheExpirationTime: 600000, cacheMaxSize: 1000 }}
metrics: {
  consoleReporter: {enabled: true, interval: 180000},
  csvReporter: {enabled: true, interval: 180000, fileName: /tmp/gremlin-server-metrics.csv},
  jmxReporter: {enabled: true},
  slf4jReporter: {enabled: true, interval: 180000},
  gangliaReporter: {enabled: false, interval: 180000, addressingMode: MULTICAST},
  graphiteReporter: {enabled: false, interval: 180000}}
maxInitialLineLength: 4096
maxHeaderSize: 8192
maxChunkSize: 8192
maxContentLength: 65536
maxAccumulationBufferComponents: 1024

如果有人能告诉我我在这里做错了什么，我会非常感激。谢谢。

标签： gremlintinkerpopjanusgraphgremlin-server

解决方案

服务器日志输出可能会显示指向您问题的错误，但我的猜测是您正在尝试连接服务器无法识别的驱动程序序列化程序配置，因此它默认为 GraphSON 3.0 序列化。这种变化发生在很久以前，可以追溯到3.3.0 版本的TINKERPOP-1565。

当我们开始推动 GraphSON 3.0 时，我们希望它是默认的基于 JSON 的网络序列化格式，所以我们给它“application/json”mime 类型，它以前是无类型的 GraphSON 1.0。因此，您需要一些自定义配置以使驱动程序和服务器识别您想要发生的事情：

gremlin> cluster = Cluster.build().serializer(new GraphSONMessageSerializerV1d0()).create()
==>localhost/127.0.0.1:8182
gremlin> client = cluster.connect()
==>org.apache.tinkerpop.gremlin.driver.Client$ClusteredClient@277b8fa4
gremlin> x = client.submit("[1,2,3]").all().get()
==>result{object=1 class=java.lang.Integer}
==>result{object=2 class=java.lang.Integer}
==>result{object=3 class=java.lang.Integer}

您可以看到您必须显式构建GraphSONMessageSerializerV1d0（在您的情况下，您可能会JanusGraphIoRegistry使用带有GraphSONMapper.

综上所述，虽然 GraphSON 1.0 没有任何进展，但奇怪的是您需要直接使用它。除非您有充分的理由这样做，否则我强烈建议您坚持使用 GraphSON 3.0。对于大多数序列化操作，它在图形提供者中拥有最广泛的支持，几乎与 Gryo 一样快。如果您只使用 JVM，我什至建议尝试 GraphBinary 而不是回到 GraphSON 1.0。

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