janusgraph | 易学教程

Best way to get (millions of rows of) data into Janusgraph via Tinkerpop, with a specific model

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问题 Just started out with Tinkerpop and Janusgraph, and I'm trying to figure this out based on the documentation. I have three datasets, each containing about 20 milions rows (csv files) There is a specific model in which the variables and rows need to be connected, e.g. what are vertices, what are labels, what are edges, etc. After having everything in a graph, I'd like to of course use some basic Gremlin to see how well the model works. But first I need a way to get the data into Janusgraph.

How to build index for already present property?

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问题 When I am updating my schema, I created a new property(say A) but I forgot to build index. Without knowing that, I have tried to add the value for that property resulted in :> g.V().hasLabel('AA').has('active',true).property('A','ok').count() ** Could not find a suitable index to answer graph query and graph scans are disabled: [(~label = user)]:VERTEX** :> g.V().hasLabel('AA').has('active',true).has('A','ok').valueMap() But when I do valueMap by traversing it with other indexed property then

How to build index for already present property?

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【巨杉数据库SequoiaDB】社区分享 | SequoiaDB + JanusGraph 实践

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本文来自社区用户投稿，感谢小伙伴的技术分享项目背景大家好！在春节这段时间里，由于一直在家，所以花时间捣鼓了一下代码，自己做了 SequoiaDB 和 JanusGraph 的兼容扩展工作。自己觉得这个项目还是挺有意思的，本着开源即是美德的想法，我把自己的代码开源出来了，欢迎 JanusGraph 和 SDB 爱好者拍砖，也希望对这块比较感兴趣的朋友，可以和我一起来完善这个项目。我们团队在做一个项目时，引入了国产数据库 SequoiaDB，感觉效率啊，维护性啊，都比较友好。自己呢，年前也刚好在其他场景需要应用到一些图计算相关的技术，就想着是否可以为 SequoiaDB 加个 JanusGraph 的翅膀。因为根据我的理解，JanusGraph 对存储扩展极度的友好。（项目地址：https://github.com/ak918808/sequoiadb_for_janusgraph） JanusGraph 介绍实际上，在图数据领域里，Neo4j 才是真正处于统治地位的，但是无奈它的社区版本，性能“限（yan）制（ge）”得太过分了，功能也是各种被砍，难以使用在生产环境里。至于企业版，目前也没有专门的预算给到这块的需求。而看看图数据库里的老二 -- JanusGraph ，Apache 基金会顶级项目，顶着当年明星项目 Titan 的光环，继续忍辱负重地前行。

Using valueMap with match()

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问题 I am calling JanusGraph remote, which returns ReferenceVertex by default. In order to retrieve properties as well, I use valueMap(), which works well for simple queries. However, in my use case I need to build a join, which works well based on ReferenceVertex as follows: // select t1.table2_ID, t2.table2_ID from table1 as t1 inner join table2 as t2 on t1.table2_ID = t2.table2_ID GraphTraversal<?, ?> t1 = __.start().as("table1").out("relatesTo").hasLabel("table2").as("table2"); GraphTraversal<

Where to configure GraphSONVersion.V1_0 for JanusGraph Gremlin Server?

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问题 I am using JanusGraph 0.3.1 and gremlin javascript driver from Tinkerpop. I am trying to access the graph and when I try to retrieve the valueMap() in my queries, I am getting type information. Which is not what I was looking for I am looking for plain V1_0 variation of the GraphSON response. Please suggest where I shall update the GraphSON version configuration? on the server? or on the client while creating the client object? In my node js service's package.json I've: "gremlin": "^2.6.0",

Gremlin Python in Web Application

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问题 I have a python flask web app, which is querying a Janus graph DB using gremlin_python . One basic question is the correct way to initialize the graph traversal object. Can I initialize my traversal g = traversal().withRemote(DriverRemoteConnection(...) and persist the traversal variable g across requests? (All requests are against the same graph. I tried this and started getting tornado.iostream.StreamClosedError intermittently. Second option is the create a traversal per request. I do not

Using JanusGraph with Solr

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问题 Setting up JanusGraph i noticed the following in the console: 09:04:12,175 INFO ReflectiveConfigOptionLoader:173 - Loaded and initialized config classes: 10 OK out of 12 attempts in PT0.023S 09:04:12,230 INFO Reflections:224 - Reflections took 28 ms to scan 1 urls, producing 2 keys and 2 values 09:04:12,291 WARN GraphDatabaseConfiguration:1445 - Local setting index.search.index-name=entity (Type: GLOBAL_OFFLINE) is overridden by globally managed value (janusgraph). Use the ManagementSystem

vertex_ids table missing in cassandra under the janusgraph keyspace?

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问题 Titan graph when used with cassandra creates a table "vertex_ids" under the "titan" keyspace. But when working with janus , I can't seem to find the "vertex_ids" table under the 'janusgrpah' keyspace. Also I read the documentation where they describe how the values are stored but it doesn't tell under which tables. 回答1: JanusGraph started from TitanDB 1.0.0. Both are using these below cassandra tables : edgestore : Store Vertex, Property and Edges as Adjacency List graphindex : Builtin

Janusgraph error while tring to connect with backend

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问题 I'm trying to run ./bin/gremlin-server.sh ./conf/gremlin-server/gremlin-server.yaml I can see cassandra in process list but the client wont connect, i got this error all the time: 263 [main] INFO org.apache.tinkerpop.gremlin.server.GremlinServer - Configuring Gremlin Server from ./conf/gremlin-server/gremlin-server.yaml 400 [main] INFO org.apache.tinkerpop.gremlin.server.util.MetricManager - Configured Metrics ConsoleReporter configured with report interval=180000ms 402 [main] INFO org.apache