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java - 配置 JanusGraph 通过 Java 使用 Lucene

转载 作者:行者123 更新时间:2023-12-01 17:53:15 26 4
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我尝试使用以下代码连接到 JanusGraph:

Graph graph = GraphFactory.open(new PropertiesConfiguration("janusgraph.propertes");

我的janusgraph.properties文件如下:

gremlin.graph=org.janusgraph.core.JanusGraphFactory
storage.backend=hbase
storage.hostname=127.0.0.1

cache.db-cache = true
cache.db-cache-clean-wait = 20
cache.db-cache-time = 180000
cache.db-cache-size = 0.5

index.janusgraph-index.backend=lucene

但是,当我尝试连接时出现以下错误:

Exception in thread "Thread-4" java.lang.RuntimeException: GraphFactory could not instantiate this Graph implementation [class org.janusgraph.core.JanusGraphFactory]
at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:82)
at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:70)
at uk.gov.nca.cdp.graphutils.server.controllers.MergeGraph.lambda$merge$0(MergeGraph.java:26)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:78)
... 3 more
Caused by: java.lang.IllegalArgumentException: Could not find implementation class: org.janusgraph.diskstorage.es.ElasticSearchIndex
at org.janusgraph.util.system.ConfigurationUtil.instantiate(ConfigurationUtil.java:61)
at org.janusgraph.diskstorage.Backend.getImplementationClass(Backend.java:477)
at org.janusgraph.diskstorage.Backend.getIndexes(Backend.java:464)
at org.janusgraph.diskstorage.Backend.<init>(Backend.java:149)
at org.janusgraph.graphdb.configuration.GraphDatabaseConfiguration.getBackend(GraphDatabaseConfiguration.java:1897)
at org.janusgraph.graphdb.database.StandardJanusGraph.<init>(StandardJanusGraph.java:136)
at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:164)
at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:133)
at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:113)
... 8 more
Caused by: java.lang.ClassNotFoundException: org.janusgraph.diskstorage.es.ElasticSearchIndex
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:94)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at org.janusgraph.util.system.ConfigurationUtil.instantiate(ConfigurationUtil.java:56)
... 16 more

这听起来像是尝试使用 Elasticsearch 而不是 Lucene。如何正确配置它以使用 Lucene?

最佳答案

您遇到的问题是您的配置没有定义 storage.hbase.table所以默认表名janusgraph使用(请参阅 JanusGraph configuration reference )。名为 janusgraph 的 HBase 表必须是之前使用 Elasticsearch 为索引提供程序创建的。 JanusGraph 将其初始配置存储在 HBase 表中,因此当您连接到 janusgraph 时表,它正在从 janusgraph 读取旧属性 table 。您应该:

  • 删除现有的 janusgraph HBase 表。从 HBase shell:disable 'janusgraph'; drop 'janusgraph';
  • 通过设置 storage.hbase.table=mygraph 使用不同的 HBase 表

JanusGraph Lucene documentation 中所述,Lucene 索引后端在其配置中需要两个参数:

  • index.[X].backend=lucene
  • index.[X].directory=/data/searchindex

哪里[X]是索引的名称。您可以将其设置为匹配目录名称 searchindex ,或search如示例中常见的那样,或 janusgraph-index就像你的问题一样。确保包含这两个配置属性。

关于java - 配置 JanusGraph 通过 Java 使用 Lucene,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47653285/

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