我正在尝试使用以下配置实例化JanusGraph，使用 Cassandra 作为存储后端， ElasticSearch 作为索引后端：
JanusGraph graph = JanusGraphFactory.build()
.set("storage.backend", "cassandra")
.set("storage.hostname", "localhost")
.set("cache.db-cache", true)
.set("schema.default", "none")
.set("index.search.backend", "elasticsearch")
.set("index.search.elasticsearch.client-only", "false")
.set("index.search.elasticsearch.local-mode", "true")
.open();
如果cassandra的cluser名为Test Cluster，则上述代码有效。如果我将其重命名为其他内容，则抛出异常：
java.lang.IllegalArgumentException: Could not instantiate implementation: org.janusgraph.diskstorage.es.ElasticSearchIndex
at org.janusgraph.util.system.ConfigurationUtil.instantiate(ConfigurationUtil.java:69)
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:1850)
at org.janusgraph.graphdb.database.StandardJanusGraph.<init>(StandardJanusGraph.java:134)
at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:107)
at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:97)
at org.janusgraph.core.JanusGraphFactory$Builder.open(JanusGraphFactory.java:152)
at engineering.divine.core.GraphFactory.cassandraGraph(GraphFactory.java:403)
at engineering.divine.core.GraphFactory.graph(GraphFactory.java:298)
at engineering.divine.core.GraphFactory.getDefault(GraphFactory.java:99)
at engineering.divine.repository.Repository.listRepositoriesToUpdate(Repository.java:130)
at engineering.divine.daemon.RepositoryAnalysisDaemon.run(RepositoryAnalysisDaemon.java:24)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at org.janusgraph.util.system.ConfigurationUtil.instantiate(ConfigurationUtil.java:58)
... 20 more
Caused by: org.elasticsearch.client.transport.NoNodeAvailableException: None of the configured nodes are available: []
at org.elasticsearch.client.transport.TransportClientNodesService.ensureNodesAreAvailable(TransportClientNodesService.java:279)
at org.elasticsearch.client.transport.TransportClientNodesService.execute(TransportClientNodesService.java:198)
at org.elasticsearch.client.transport.support.InternalTransportClusterAdminClient.execute(InternalTransportClusterAdminClient.java:86)
at org.elasticsearch.client.support.AbstractClusterAdminClient.health(AbstractClusterAdminClient.java:127)
at org.elasticsearch.action.admin.cluster.health.ClusterHealthRequestBuilder.doExecute(ClusterHealthRequestBuilder.java:92)
at org.elasticsearch.action.ActionRequestBuilder.execute(ActionRequestBuilder.java:91)
at org.elasticsearch.action.ActionRequestBuilder.execute(ActionRequestBuilder.java:65)
at org.janusgraph.diskstorage.es.ElasticSearchIndex.<init>(ElasticSearchIndex.java:215)
... 25 more
如何使elasticsearch使用我的新群集名称？
使用Max OS X 10.11.6，任何指针都受到高度赞赏。
答案 0 :(得分：0)
重置您的数据（如果是用于测试目的）
在JanusGraph
每个配置选项都有一定的可变性级别，用于控制在首次打开数据库后是否以及如何修改它。以下列表描述了可变性级别。
打开数据库后，无法在数据库的整个生命周期内更改这些配置选项
只有在关闭所有实例时，才能立即为整个数据库集群更改这些选项
这些选项只能在整个数据库群集中进行全局更改 屏蔽的 这些选项是全局的，但可以由本地配置文件覆盖
这些选项只能通过本地配置文件提供
您可以从以下链接
获取任何配置的可变性级别