【问题标题】：Issues getting correct data from gremlin server从 gremlin 服务器获取正确数据的问题
【发布时间】：2020-01-24 21:20:40
【问题描述】：

我遇到了一系列让我发疯的荒谬问题。我正在努力完成几件事：

我正在尝试将我的 gremlin 服务器设置为“加载”某个 json 格式为 graphson 的文件，并在那里遇到非常奇怪的问题，我将详细介绍。
我正在尝试运行一个简单的 ajax 调用来查询该数据，但是 - 我不仅无法获得我想要的数据（这可能是有道理的，因为 gremlin 拒绝加载它），我似乎正在获取一些我不知道来自哪里的数据。
我试图弄清楚如何在我的终端上测试 gremlin 服务器，但我无法运行查询，因为 ./gremlin-server.sh status 返回 Server not running，即使它 100% 运行并且我的 ajax 调用可以看到.

Gremlin 没有加载文件

要启动，我正在运行 Gremlin v.3.4.3，可以在 here 找到它。我用来运行 gremlin 的命令是

bin/gremlin-server.sh data/gremlin-server-rest-modern.yaml

Gremlin Server 下载自带的 yaml 文件，其内容为：

#...license stuff...

host: localhost
port: 8182
scriptEvaluationTimeout: 30000
channelizer: org.apache.tinkerpop.gremlin.server.channel.HttpChannelizer
graphs: {
  graph: conf/tinkergraph-empty.properties}
scriptEngines: {
  gremlin-groovy: {
    plugins: { 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/generate-modern.groovy]}}}}
serializers:
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV3d0, config: { ioRegistries: [org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerIoRegistryV3d0] }}         # application/json
metrics: {
  slf4jReporter: {enabled: true, interval: 180000}}
strictTransactionManagement: false
maxInitialLineLength: 4096
maxHeaderSize: 8192
maxChunkSize: 8192
maxContentLength: 65536
maxAccumulationBufferComponents: 1024
resultIterationBatchSize: 64

现在，据我了解，需要注意的重要一点是组件graph 导致properties 文件。我正在加载的属性文件是tinkergraph-empty.properties，其内容是：

gremlin.graph=org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerGraph
gremlin.tinkergraph.vertexIdManager=LONG

文件名tinkergraph-empty 暗示了一些重要的事情：gremlin 服务器不会加载图表。很酷 - 当我启动 gremlin 服务器时，它会正常加载并显示我可以预期的结果：

[INFO] GremlinServer - Configuring Gremlin Server from ./conf/gremlin-server-rest-modern.yaml
[INFO] MetricManager - Configured Metrics Slf4jReporter configured with interval=180000ms and loggerName=org.apache.tinkerpop.gremlin.server.Settings$Slf4jReporterMetrics
[INFO] DefaultGraphManager - Graph [graph] was successfully configured via [conf/tinkergraph-empty.properties].
[INFO] ServerGremlinExecutor - Initialized Gremlin thread pool.  Threads in pool named with pattern gremlin-*
[INFO] ServerGremlinExecutor - Initialized GremlinExecutor and preparing GremlinScriptEngines instances.
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.codehaus.groovy.vmplugin.v7.Java7$1 (file:/Users/<user>/apache-tinkerpop-gremlin-server-3.4.3/lib/groovy-2.5.7-indy.jar) to constructor java.lang.invoke.MethodHandles$Lookup(java.lang.Class,int)
WARNING: Please consider reporting this to the maintainers of org.codehaus.groovy.vmplugin.v7.Java7$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[INFO] ServerGremlinExecutor - Initialized gremlin-groovy GremlinScriptEngine and registered metrics
[INFO] ServerGremlinExecutor - A GraphTraversalSource is now bound to [g] with graphtraversalsource[tinkergraph[vertices:0 edges:0], standard]
[INFO] OpLoader - Adding the standard OpProcessor.
[INFO] OpLoader - Adding the session OpProcessor.
[INFO] OpLoader - Adding the traversal OpProcessor.
[INFO] TraversalOpProcessor - Initialized cache for TraversalOpProcessor with size 1000 and expiration time of 600000 ms
[INFO] GremlinServer - Executing start up LifeCycleHook
[INFO] Logger$info - Loading 'modern' graph data.
[INFO] AbstractChannelizer - Configured application/vnd.gremlin-v3.0+json with org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV3d0
[INFO] AbstractChannelizer - Configured application/json with org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV3d0
[INFO] GremlinServer$1 - Gremlin Server configured with worker thread pool of 1, gremlin pool of 8 and boss thread pool of 1.
[INFO] GremlinServer$1 - Channel started at port 8182.

这一行特别有希望：[INFO] ServerGremlinExecutor - A GraphTraversalSource is now bound to [g] with graphtraversalsource[tinkergraph[vertices:0 edges:0], standard]

它“加载”的图（我假设它必须初始化一个图）的顶点和边为零。

当我运行我的 ajax 调用时，正如我所承诺的，我稍后会进入，我成功地 POST 到服务器。它已启动并正在运行。一切都很好。

不过……

当我更改 tinkerpop-empty.properties 文件夹以加载图表时，事情变得非常奇怪。我打算这样改变它：

gremlin.graph=org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerGraph
gremlin.tinkergraph.vertexIdManager=LONG
gremlin.tinkergraph.graphLocation=data/tinkerpop-crew.json
gremlin.tinkergraph.graphFormat=graphson

我现在加载了一个名为 tinkerpop-crew.json 的数据文件夹并添加了一个 graphFormat: graphson。这应该是正确的。 json文件可以在here找到，properties文件遵循这个file的格式。

现在，当我运行它时，我得到了一个截然不同的结果：

[INFO] GremlinServer - Configuring Gremlin Server from ./conf/gremlin-server-rest-modern.yaml
[INFO] MetricManager - Configured Metrics Slf4jReporter configured with interval=180000ms and loggerName=org.apache.tinkerpop.gremlin.server.Settings$Slf4jReporterMetrics
[INFO] DefaultGraphManager - Graph [graph] was successfully configured via [conf/tinkergraph-empty.properties].
[INFO] ServerGremlinExecutor - Initialized Gremlin thread pool.  Threads in pool named with pattern gremlin-*
[INFO] ServerGremlinExecutor - Initialized GremlinExecutor and preparing GremlinScriptEngines instances.
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.codehaus.groovy.vmplugin.v7.Java7$1 (file:/Users/xbbn1xn/apache-tinkerpop-gremlin-server-3.4.3/lib/groovy-2.5.7-indy.jar) to constructor java.lang.invoke.MethodHandles$Lookup(java.lang.Class,int)
WARNING: Please consider reporting this to the maintainers of org.codehaus.groovy.vmplugin.v7.Java7$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[INFO] ServerGremlinExecutor - Initialized gremlin-groovy GremlinScriptEngine and registered metrics
[INFO] ServerGremlinExecutor - A GraphTraversalSource is now bound to [g] with graphtraversalsource[tinkergraph[vertices:6 edges:14], standard]
[INFO] OpLoader - Adding the standard OpProcessor.
[INFO] OpLoader - Adding the session OpProcessor.
[INFO] OpLoader - Adding the traversal OpProcessor.
[INFO] TraversalOpProcessor - Initialized cache for TraversalOpProcessor with size 1000 and expiration time of 600000 ms
[INFO] GremlinServer - Executing start up LifeCycleHook
[INFO] Logger$info - Loading 'modern' graph data.
[ERROR] GremlinServer - Gremlin Server Error
java.lang.IllegalArgumentException: Vertex with id already exists: 1
    at org.apache.tinkerpop.gremlin.structure.Graph$Exceptions.vertexWithIdAlreadyExists(Graph.java:1196)
    at org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerGraph.addVertex(TinkerGraph.java:167)
    at org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerFactory.generateModern(TinkerFactory.java:90)
    at org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerFactory$generateModern.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:115)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:127)
    at Script1$_run_closure1.doCall(Script1.groovy:28)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:567)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:101)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:323)
    at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:263)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1041)
    at groovy.lang.Closure.call(Closure.java:405)
    at org.codehaus.groovy.runtime.ConvertedMap.invokeCustom(ConvertedMap.java:54)
    at org.codehaus.groovy.runtime.ConversionHandler.invoke(ConversionHandler.java:122)
    at com.sun.proxy.$Proxy15.onStartUp(Unknown Source)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.lambda$start$1(GremlinServer.java:154)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.start(GremlinServer.java:151)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.main(GremlinServer.java:346)
[ERROR] GremlinServer - Gremlin Server was unable to start and will now begin shutdown: Vertex with id already exists: 1
[INFO] GremlinServer - Shutting down OpProcessor[]
[INFO] GremlinServer - Shutting down OpProcessor[session]
[INFO] GremlinServer - Shutting down OpProcessor[traversal]
[INFO] GremlinServer - Shutting down thread pools.
[INFO] GremlinServer - Executing shutdown LifeCycleHook
[INFO] GremlinServer - Closed Graph instance [graph]
[INFO] GremlinServer - Gremlin Server - shutdown complete

嗯？顶点已经存在？这不可能。我什至从来没有运行这个文件，为什么会有任何关于它的记忆？就 gremlin 而言，我什至从未加载过图表。也许它会启动一个图表并忘记从内存中删除它或其他什么，对吧？

好吧，让我们创建我们自己的文件并只初始化一个 Vertex 和一些奇怪的素数并且没有边。我们就叫它tinkerpop-crew2.json：

{"id":{"@type":"g:Int64","@value":47284629},"label":"person"}.

可能不是素数。任何。好的，太棒了，成功了！

[INFO] GremlinServer - Configuring Gremlin Server from ./conf/gremlin-server-rest-modern.yaml
[INFO] MetricManager - Configured Metrics Slf4jReporter configured with interval=180000ms and loggerName=org.apache.tinkerpop.gremlin.server.Settings$Slf4jReporterMetrics
[INFO] DefaultGraphManager - Graph [graph] was successfully configured via [conf/tinkergraph-empty.properties].
[INFO] ServerGremlinExecutor - Initialized Gremlin thread pool.  Threads in pool named with pattern gremlin-*
[INFO] ServerGremlinExecutor - Initialized GremlinExecutor and preparing GremlinScriptEngines instances.
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.codehaus.groovy.vmplugin.v7.Java7$1 (file:/Users/xbbn1xn/apache-tinkerpop-gremlin-server-3.4.3/lib/groovy-2.5.7-indy.jar) to constructor java.lang.invoke.MethodHandles$Lookup(java.lang.Class,int)
WARNING: Please consider reporting this to the maintainers of org.codehaus.groovy.vmplugin.v7.Java7$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[INFO] ServerGremlinExecutor - Initialized gremlin-groovy GremlinScriptEngine and registered metrics
[INFO] ServerGremlinExecutor - A GraphTraversalSource is now bound to [g] with graphtraversalsource[tinkergraph[vertices:1 edges:0], standard]
[INFO] OpLoader - Adding the standard OpProcessor.
[INFO] OpLoader - Adding the session OpProcessor.
[INFO] OpLoader - Adding the traversal OpProcessor.
[INFO] TraversalOpProcessor - Initialized cache for TraversalOpProcessor with size 1000 and expiration time of 600000 ms
[INFO] GremlinServer - Executing start up LifeCycleHook
[INFO] Logger$info - Loading 'modern' graph data.
[INFO] AbstractChannelizer - Configured application/vnd.gremlin-v3.0+json with org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV3d0
[INFO] AbstractChannelizer - Configured application/json with org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV3d0
[INFO] GremlinServer$1 - Gremlin Server configured with worker thread pool of 1, gremlin pool of 8 and boss thread pool of 1.
[INFO] GremlinServer$1 - Channel started at port 8182.

注意这里：[INFO] ServerGremlinExecutor - A GraphTraversalSource is now bound to [g] with graphtraversalsource[tinkergraph[vertices:1 edges:0], standard]。一个顶点。

当我们将服务器配置为再次使用该文件时会发生什么？

[INFO] GremlinServer - Configuring Gremlin Server from ./conf/gremlin-server-rest-modern.yaml
[INFO] MetricManager - Configured Metrics Slf4jReporter configured with interval=180000ms and loggerName=org.apache.tinkerpop.gremlin.server.Settings$Slf4jReporterMetrics
[INFO] DefaultGraphManager - Graph [graph] was successfully configured via [conf/tinkergraph-empty.properties].
[INFO] ServerGremlinExecutor - Initialized Gremlin thread pool.  Threads in pool named with pattern gremlin-*
[INFO] ServerGremlinExecutor - Initialized GremlinExecutor and preparing GremlinScriptEngines instances.
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.codehaus.groovy.vmplugin.v7.Java7$1 (file:/Users/xbbn1xn/apache-tinkerpop-gremlin-server-3.4.3/lib/groovy-2.5.7-indy.jar) to constructor java.lang.invoke.MethodHandles$Lookup(java.lang.Class,int)
WARNING: Please consider reporting this to the maintainers of org.codehaus.groovy.vmplugin.v7.Java7$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[INFO] ServerGremlinExecutor - Initialized gremlin-groovy GremlinScriptEngine and registered metrics
[INFO] ServerGremlinExecutor - A GraphTraversalSource is now bound to [g] with graphtraversalsource[tinkergraph[vertices:7 edges:6], standard]
[INFO] OpLoader - Adding the standard OpProcessor.
[INFO] OpLoader - Adding the session OpProcessor.
[INFO] OpLoader - Adding the traversal OpProcessor.
[INFO] TraversalOpProcessor - Initialized cache for TraversalOpProcessor with size 1000 and expiration time of 600000 ms
[INFO] GremlinServer - Executing start up LifeCycleHook
[INFO] Logger$info - Loading 'modern' graph data.
[ERROR] GremlinServer - Gremlin Server Error
java.lang.IllegalArgumentException: Vertex with id already exists: 1
    at org.apache.tinkerpop.gremlin.structure.Graph$Exceptions.vertexWithIdAlreadyExists(Graph.java:1196)
    at org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerGraph.addVertex(TinkerGraph.java:167)
    at org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerFactory.generateModern(TinkerFactory.java:90)
    at org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerFactory$generateModern.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:115)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:127)
    at Script1$_run_closure1.doCall(Script1.groovy:28)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:567)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:101)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:323)
    at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:263)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1041)
    at groovy.lang.Closure.call(Closure.java:405)
    at org.codehaus.groovy.runtime.ConvertedMap.invokeCustom(ConvertedMap.java:54)
    at org.codehaus.groovy.runtime.ConversionHandler.invoke(ConversionHandler.java:122)
    at com.sun.proxy.$Proxy15.onStartUp(Unknown Source)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.lambda$start$1(GremlinServer.java:154)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.start(GremlinServer.java:151)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.main(GremlinServer.java:346)
[ERROR] GremlinServer - Gremlin Server was unable to start and will now begin shutdown: Vertex with id already exists: 1
[INFO] GremlinServer - Shutting down OpProcessor[]
[INFO] GremlinServer - Shutting down OpProcessor[session]
[INFO] GremlinServer - Shutting down OpProcessor[traversal]
[INFO] GremlinServer - Shutting down thread pools.
[INFO] GremlinServer - Executing shutdown LifeCycleHook
[INFO] GremlinServer - Closed Graph instance [graph]
[INFO] GremlinServer - Gremlin Server - shutdown complete

和以前一样的错误。这到底是怎么回事？还有两件事引起了我的注意：

ERROR] GremlinServer - Gremlin Server Error java.lang.IllegalArgumentException: Vertex with id already exists: 1。是说只有一个顶点存在，还是 ID 为“1”的顶点存在？因为我的所有顶点的 ID 都不是 1。也就是说，直到...
您注意到这甚至没有加载我的文件！ [INFO] ServerGremlinExecutor - A GraphTraversalSource is now bound to [g] with graphtraversalsource[tinkergraph[vertices:7 edges:6], standard]。我的文件没有 7 个顶点和 6 个边。它有 1 个顶点和 0 个边。这实际上看起来很可疑，就像它正在加载原始的 tinkerpop-crew.json 文件，或者类似的东西，尽管当我们最初加载它时，INFO 消息说：[INFO] ServerGremlinExecutor - A GraphTraversalSource is now bound to [g] with graphtraversalsource[tinkergraph[vertices:6 edges:14], standard]。

好的，所以我不知道这里发生了什么。

运行我的 ajax 查询以查看发生了什么

我有一个非常非常简单的查询，我使用 AJAX 调用运行和发布：

$.ajax({
            type: "POST",
            accept: "application/json",
            url: url // http://localhost:8182,
            timeout: timeout // I have it set to 3500,
            data: JSON.stringify({"gremlin" : q}),
            success: function(data, textStatus, jqXHR){
                            var retrvData = data.result.data;
                            console.log(retrvData)
}

好的，有几件重要的事情。 q 变量是我发送到 Gremlin 服务器以返回一些数据的查询，它看起来像这样：

q = 'nodes = g.V().limit(15).toList();edges = g.V(nodes).aggregate('node').outE().as('edge').inV().where(within('node')).select('edge').toList();[nodes,edges]'

这个查询本质上应该返回一个节点和边的列表。现在，我想回顾三个案例：

tinkerpop-empty.properties（实际上是空的）：

第一种情况是使用未更改的 tinkerpop-empty.properties 文件。请记住，当我加载它时，我得到的输出是：

[INFO] ServerGremlinExecutor - A GraphTraversalSource is now bound to [g] with graphtraversalsource[tinkergraph[vertices:0 edges:0], standard]

这意味着 tinkergraph 中不应该有任何信息。我应该收到一个空列表。但是，当我打电话时，我得到了这个：

value: Array(2)
0: Array(7)
0: {id: 1, label: "person", type: "vertex"}
1: {id: 2, label: "person", type: "vertex"}
2: {id: 3, label: "software", type: "vertex"}
3: {id: 47284629, label: "person", type: "vertex"}
4: {id: 4, label: "person", type: "vertex"}
5: {id: 5, label: "software", type: "vertex"}
6: {id: 6, label: "person", type: "vertex"}
length: 7
__proto__: Array(0)
1: Array(6)
0: {id: 9, label: "created", inVLabel: "software", outVLabel: "person", inV: 3, …}
1: {id: 7, label: "knows", inVLabel: "person", outVLabel: "person", inV: 2, …}
2: {id: 8, label: "knows", inVLabel: "person", outVLabel: "person", inV: 4, …}
3: {id: 10, label: "created", inVLabel: "software", outVLabel: "person", inV: 5, …}
4: {id: 11, label: "created", inVLabel: "software", outVLabel: "person", inV: 3, …}
5: {id: 12, label: "created", inVLabel: "software", outVLabel: "person", inV: 3, …}
length: 6

这是开发者控制台中的输出（来自 console.log(retrvData)）。有各种各样的数据。看，节点的长度是 7，边是 6。听起来很熟悉？为什么 gremlin 加载这些数据？为什么将它发送到我的 ajax 查询？

tinkergraph-empty.properties（修改为使用 tinkerpop-crew.json）

好吧，随便。让我们运行下一个properties 文件。请记住，我们现在使用tinkerpop-crew.json 并将graphFormat 设置为graphson。

当然，我得到了与以前相同的错误，即java.lang.IllegalArgumentException: Vertex with id already exists: 1。我的服务器也关闭了：

[ERROR] GremlinServer - Gremlin Server was unable to start and will now begin shutdown: Vertex with id already exists: 1
[INFO] GremlinServer - Shutting down OpProcessor[]
[INFO] GremlinServer - Shutting down OpProcessor[session]
[INFO] GremlinServer - Shutting down OpProcessor[traversal]
[INFO] GremlinServer - Shutting down thread pools.
[INFO] GremlinServer - Executing shutdown LifeCycleHook
[INFO] GremlinServer - Closed Graph instance [graph]
[INFO] GremlinServer - Gremlin Server - shutdown complete

让我们转到我的 AJAX 查询，看看我们得到了什么。

当然没有。我的 gremlin 服务器崩溃了。看起来它可能正在加载正确的文件，因为 INFO 日志显示 A GraphTraversalSource is now bound to [g] with graphtraversalsource[tinkergraph[vertices:6 edges:14], standard]。我还没有验证这是否正确......这并不容易。

tinkerpop-empty.properties 加载 tinkerpop-crew2.json

我们第一次运行tinkerpop-crew2.json，一切顺利。我们将 ID 更改为一些奇怪的数字并且没有抛出异常。此外，图表似乎加载了正确的东西。现在让我们再次运行它，并将 ID 更改为4724729456382。

好的，哇，我边走边打字，看看我刚刚找到了什么：

{"id":{"@type":"g:Int64","@value":1},"label":"person","outE":{"created":[{"id":{"@type":"g:Int32","@value":9},"inV":{"@type":"g:Int64","@value":3},"properties":{"weight":{"@type":"g:Double","@value":0.4}}}],"knows":[{"id":{"@type":"g:Int32","@value":7},"inV":{"@type":"g:Int64","@value":2},"properties":{"weight":{"@type":"g:Double","@value":0.5}}},{"id":{"@type":"g:Int32","@value":8},"inV":{"@type":"g:Int64","@value":4},"properties":{"weight":{"@type":"g:Double","@value":1.0}}}]},"properties":{"name":[{"id":{"@type":"g:Int64","@value":0},"value":"marko"}],"age":[{"id":{"@type":"g:Int64","@value":2},"value":{"@type":"g:Int32","@value":29}}]}}
{"id":{"@type":"g:Int64","@value":2},"label":"person","inE":{"knows":[{"id":{"@type":"g:Int32","@value":7},"outV":{"@type":"g:Int64","@value":1},"properties":{"weight":{"@type":"g:Double","@value":0.5}}}]},"properties":{"name":[{"id":{"@type":"g:Int64","@value":3},"value":"vadas"}],"age":[{"id":{"@type":"g:Int64","@value":4},"value":{"@type":"g:Int32","@value":27}}]}}
{"id":{"@type":"g:Int64","@value":3},"label":"software","inE":{"created":[{"id":{"@type":"g:Int32","@value":9},"outV":{"@type":"g:Int64","@value":1},"properties":{"weight":{"@type":"g:Double","@value":0.4}}},{"id":{"@type":"g:Int32","@value":11},"outV":{"@type":"g:Int64","@value":4},"properties":{"weight":{"@type":"g:Double","@value":0.4}}},{"id":{"@type":"g:Int32","@value":12},"outV":{"@type":"g:Int64","@value":6},"properties":{"weight":{"@type":"g:Double","@value":0.2}}}]},"properties":{"name":[{"id":{"@type":"g:Int64","@value":5},"value":"lop"}],"lang":[{"id":{"@type":"g:Int64","@value":6},"value":"java"}]}}
{"id":{"@type":"g:Int64","@value":4},"label":"person","inE":{"knows":[{"id":{"@type":"g:Int32","@value":8},"outV":{"@type":"g:Int64","@value":1},"properties":{"weight":{"@type":"g:Double","@value":1.0}}}]},"outE":{"created":[{"id":{"@type":"g:Int32","@value":10},"inV":{"@type":"g:Int64","@value":5},"properties":{"weight":{"@type":"g:Double","@value":1.0}}},{"id":{"@type":"g:Int32","@value":11},"inV":{"@type":"g:Int64","@value":3},"properties":{"weight":{"@type":"g:Double","@value":0.4}}}]},"properties":{"name":[{"id":{"@type":"g:Int64","@value":7},"value":"josh"}],"age":[{"id":{"@type":"g:Int64","@value":8},"value":{"@type":"g:Int32","@value":32}}]}}
{"id":{"@type":"g:Int64","@value":5},"label":"software","inE":{"created":[{"id":{"@type":"g:Int32","@value":10},"outV":{"@type":"g:Int64","@value":4},"properties":{"weight":{"@type":"g:Double","@value":1.0}}}]},"properties":{"name":[{"id":{"@type":"g:Int64","@value":9},"value":"ripple"}],"lang":[{"id":{"@type":"g:Int64","@value":10},"value":"java"}]}}
{"id":{"@type":"g:Int64","@value":6},"label":"person","outE":{"created":[{"id":{"@type":"g:Int32","@value":12},"inV":{"@type":"g:Int64","@value":3},"properties":{"weight":{"@type":"g:Double","@value":0.2}}}]},"properties":{"name":[{"id":{"@type":"g:Int64","@value":11},"value":"peter"}],"age":[{"id":{"@type":"g:Int64","@value":12},"value":{"@type":"g:Int32","@value":35}}]}}
{"id":{"@type":"g:Int64","@value":47284629},"label":"person"}

这就是我tinkerpop-crew2.json的内容了！这里发生了什么？为什么 gremlin-server 将信息转储到该文件？如果您看到最后一行，它包含文件的原始内容：

{"id":{"@type":"g:Int64","@value":47284629},"label":"person"}

好吧，真的，@tinkerpop，这是什么鬼？

我想现在是有道理的，为什么当我第二次运行该文件时，它再次抛出该错误并说 id 为 1 的顶点已经存在！

搞笑的是，我离题了！让我们删除该文件的非原始部分并运行它：

{"id":{"@type":"g:Int64","@value":47284629},"label":"person"}

好的，使用正确的 INFO 运行良好，我应该期待：[INFO] ServerGremlinExecutor - A GraphTraversalSource is now bound to [g] with graphtraversalsource[tinkergraph[vertices:1 edges:0], standard]。

现在，让我们运行 AJAX 调用...

啊！！一样的！！

value: Array(2)
0: Array(7)
0: {id: 1, label: "person", type: "vertex"}
1: {id: 2, label: "person", type: "vertex"}
2: {id: 3, label: "software", type: "vertex"}
3: {id: 47284629, label: "person", type: "vertex"}
4: {id: 4, label: "person", type: "vertex"}
5: {id: 5, label: "software", type: "vertex"}
6: {id: 6, label: "person", type: "vertex"}
length: 7
__proto__: Array(0)
1: Array(6)
0: {id: 9, label: "created", inVLabel: "software", outVLabel: "person", inV: 3, …}
1: {id: 7, label: "knows", inVLabel: "person", outVLabel: "person", inV: 2, …}
2: {id: 8, label: "knows", inVLabel: "person", outVLabel: "person", inV: 4, …}
3: {id: 10, label: "created", inVLabel: "software", outVLabel: "person", inV: 5, …}
4: {id: 11, label: "created", inVLabel: "software", outVLabel: "person", inV: 3, …}
5: {id: 12, label: "created", inVLabel: "software", outVLabel: "person", inV: 3, …}
length: 6

注意节点列表的长度为 7，边的长度为 6！假设它正在加载一些东西，例如，and 附加我的文件，它应该是节点长度 8 和边长 7！这是怎么回事？

接受的答案

解决方案是进入scripts/generate-modern.groovy 并注释掉这些行：

globals << [hook : [
  onStartUp: { ctx ->
    ctx.logger.info("Loading 'modern' graph data.")
      org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerFactory.generateModern(graph)
  }
] as LifeCycleHook]

【问题讨论】：

这当然很奇怪......也许斯蒂芬马莱特可以在 Google 表单上为您提供帮助。
@user3026388 无法在此处发帖，不断收到错误消息“与服务器通信时发生错误。”这几乎是预言。
有趣，我遇到了同样的错误。一定有什么事情发生了，我想请稍等。
如果您指的是 google 群组 - 肯定会发生一些奇怪的事情。人们实际上正在提交数十个相同的帖子（过去三天），而且他们正在大量审核。我想我现在知道人们没有意识到他们实际上正在经历，所以他们不断重新提交。我在这里处理你的问题，你还希望它进入列表吗？

标签： gremlin tinkerpop tinkerpop3 gremlin-server graphson

【解决方案1】：

我认为你的情况开始出现问题：

当我更改 tinkerpop-empty.properties 文件夹以加载图表时，事情变得非常奇怪。我打算这样改变它：

gremlin.graph=org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerGraph gremlin.tinkergraph.vertexIdManager=长 gremlin.tinkergraph.graphLocation=数据/tinkerpop-crew.json gremlin.tinkergraph.graphFormat=graphson

您收到错误是因为您错过了 Gremlin 服务器初始化脚本正在运行的事实 - 您的 yaml 中的这一行：

https://github.com/apache/tinkerpop/blob/3.4.3/gremlin-server/conf/gremlin-server-rest-modern.yaml

所以这是试图将“现代”图加载到您试图指定为“船员”图的图中（或相反，我不记得哪个先加载，但我想我得到了没错）。解决方案是：

注释掉在您的scripts/generate-modern.groovy 中加载“现代”图表的行并保持您的属性文件原样或
更改scripts/generate-modern.groovy init 脚本以仅加载“船员”数据，并保持属性文件不变以生成空图。

您有一长串看起来很奇怪的其他可能性/结果，但我想知道其中有多少是由于缺少初始化文件以及它在“背后”对您做了什么。这些知识是否有助于解决您的所有问题？如果没有，请告诉我还有什么问题，我可以尝试帮助解决它。

【讨论】：

嘿斯蒂芬，我尝试了第一个建议，但是当我运行 AJAX 查询（出现在 gremlin 控制台上）时，这给了我一个错误：[WARN] HttpGremlinEndpointHandler - Invalid request - responding with 500 Internal Server Error and No such property: g for class: Script2 groovy.lang.MissingPropertyException: No such property: g for class: Script2]。你能告诉我如何做你的第二个建议吗？我无法编辑我的帖子，因为我已达到字符数限制...如果您认为这是一个好主意，我们也可以将其带到聊天室并稍后留下更新。
等等！啊哈！第一个建议奏效了！我做错了什么。非常感谢人...我知道这很简单。我查看了那个脚本并试图看看那个函数到底做了什么，但在二进制文件中找不到足够快的速度，所以我放弃了。应该继续...无论如何，谢谢
优秀。仅通过一些配置调整即可解决问题时总是很好
media1.tenor.com/images/07feba4572471b21fd4258b6af83c9c4/…
如果我们有一个原生的 Javascript TinkerPop VM 会很酷，但这基本上意味着将完整的 Java 库移植到 Javascript 并支持所有需要的东西。显然是不小的努力。鉴于最流行的 Gremlin 提供程序无论如何都是远程源（DataStax Graph、Neptune、CosmosDB 等），您通过 GLV 与 Gremlin 交互的方式几乎就是此时您与 Java 交互的方式。缺少的用例是我猜想的小型内存图情况。