JanusGraph 集群总是 returns 个没有属性的顶点 (ReferenceVertex)

Question

我在使用 janusgraph gremlin-server 和 Cluster 客户端时遇到了问题。使用 Cluster (gremlin-driver 3.2.3/3.2.5) 检索的顶点仅包含 id 属性、标签和属性始终为空。

这是我的客户端配置。

val cluster = Cluster.open("/opt/janusgraph-0.1.1-hadoop2/conf/remote-objects.yaml")

远程-objects.yaml

hosts: [localhost] 
   port: 8182
   serializer: { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}

gremlin 服务器配置：

host: localhost
port: 8182
scriptEvaluationTimeout: 30000
channelizer: org.apache.tinkerpop.gremlin.server.channel.WebSocketChannelizer
graphs: {
  graph: conf/gremlin-server/graph.properties}
plugins:
  - janusgraph.imports
scriptEngines: {
  gremlin-groovy: {
    imports: [java.lang.Math],
    staticImports: [java.lang.Math.PI],
    scripts: [scripts/empty-sample.groovy]}}
serializers:
  - { 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.GraphSONMessageSerializerGremlinV1d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerGremlinV2d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV1d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
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
resultIterationBatchSize: 64
writeBufferLowWaterMark: 32768
writeBufferHighWaterMark: 65536
ssl: {enabled: false}

使用 gremlin-console 的远程查询工作正常（remote.yaml 和 remote-objects.yaml）

使用集群和远程遍历的查询不起作用：

val g = EmptyGraph.instance().traversal().withRemote(DriverRemoteConnection.using(cluster, "g"))

g.V().toList.foreach(v => println(v, "id", v.id(), "label", v.label(), v.properties("name").toList, v.getClass))

输出：

(v[8336],id,8336,label,,List(),class org.apache.tinkerpop.gremlin.structure.util.reference.ReferenceVertex)
(v[12288],id,12288,label,,List(),class org.apache.tinkerpop.gremlin.structure.util.reference.ReferenceVertex)
(v[12304],id,12304,label,,List(),class org.apache.tinkerpop.gremlin.structure.util.reference.ReferenceVertex)
(v[12328],id,12328,label,,List(),class org.apache.tinkerpop.gremlin.structure.util.reference.ReferenceVertex)
(v[12360],id,12360,label,,List(),class org.apache.tinkerpop.gremlin.structure.util.reference.ReferenceVertex)

我做错了什么？

Answer 1

当像您尝试的那样使用远程图时，您将返回 ReferenceElements，其中包含的信息很少。不幸的是，目前没有很多文档（我有 opened a ticket to address this), but you can refer to this mailing list thread.

远程遍历工作正常，但您应该更明确地说明您的要求。例如，如果您想要 id、label 和所有 properties，您可以使用：

g.V().valueMap(true).toList()

JanusGraph 集群总是 returns 个没有属性的顶点 (ReferenceVertex)

JanusGraph cluster always returns vertex without properties (ReferenceVertex)

cluster-computing

gremlin

gremlin-server

janusgraph