将Gremlin图存储在本地DynamoDB中 [英] Store Gremlin graph in local DynamoDB
问题描述
我没有使用AWS，而是使用其本地可用的DynamoDB数据库，并在Gremlin控制台中创建了图形.
Instead of using AWS, I am using its local available DynamoDB database and creating a graph in the Gremlin console.
我的电脑正在使用Gremlin-version=3.0.1.incubating和Titan-version=1.0.0
我的问题:如何在我的本地DynamoDB中保存图形，以便我可以随时取回它? (例如，计算机重新启动后).
My question: How to save a graph in my local DynamoDB so that I can retrieve it back whenever I wish? (E.g. after computer restart).
我已经尝试了很多，使用save()或commit()图.但我总是出错:
I have tried a lot, using save() or commit() graph. But I always got an error:
g.commit()
No signature of method: org.apache.tinkerpop.gremlin.process.traversal.dsl.graph
.GraphTraversalSource.commit() is applicable for argument types: () values: []
Possible solutions: wait(), computer(), collect(), wait(long), computer(java.lang.Class), collect(groovy.lang.Closure)
我正在使用Tinkerpop 3.
推荐答案
相关文档链接:
- Amazon DynamoDB Storage Backend for Titan
- Running DynamoDB on Your Computer
如Filipe所述，g.commit()引发异常，因为g上没有commit()方法，这是 Transaction /apache/tinkerpop/gremlin/structure/Graph.html#tx--"rel =" nofollow noreferrer> Graph .在评论中，我们发现您正在尝试commit()在TinkerGraph上进行交易，该交易不支持交易.
As Filipe mentioned, g.commit() throws an exception because there is no commit() method on g which is a GraphTraversalSource. I suggested that you use graph.tx().commit(), where graph.tx() gets the Transaction from the Graph. In the comments we found out that you were trying to commit() a transaction on a TinkerGraph, which does not support transactions.
您需要实例化 TitanGraph ，而不是TinkerGraph.这通常是通过属性文件完成的，并且有一个DynamoDB Local
You need to instantiate a TitanGraph, not a TinkerGraph. This commonly done with a properties file, and there is a DynamoDB Local example properties file in the dynamodb-titan-storage-backend repository. Make sure to update the storage.dynamodb.client.endpoint to match your configuration. If you are using the Titan Server directions from the DynamoDB-Titan link, the port is 4567. If you are using the directions from the DynamoDB local link above, the default port is 8000.
gremlin> graph = TitanFactory.open('conf/gremlin-server/dynamodb-local.properties')
==>standardtitangraph[com.amazon.titan.diskstorage.dynamodb.DynamoDBStoreManager:[127.0.0.1]]
gremlin> v0 = graph.addVertex('name', 'jason'); v1 = graph.addVertex('name', 'mustaffa'); v0.addEdge('helps', v1)
==>e[175-39k-1lh-374][4232-helps->4144]
gremlin> graph.tx().commit()
==>null
还要注意，DynamoDB-Titan指令最终会启动内存中的DynamoDB Local实例.可以通过注释-inMemory参数来更改此行为. ="nofollow noreferrer"> pom.xml .
Also note, the DynamoDB-Titan directions end up starting an in-memory DynamoDB Local instance. This behavior can be changed by commenting out the -inMemory argument the pom.xml.
这篇关于将Gremlin图存储在本地DynamoDB中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
