tinkerpop3 - 无法按照文档启动 JanusGraph

Question

我正在使用 Janus Graph doc我按照提到的方式提取了它。

./gremlin.sh

工作正常，它会启动 Gremlin 提示符。

这段代码也能正常工作

graph = JanusGraphFactory.open('inmemory')
g = graph.traversal()

---

问题

当我这样做时，我得到一个巨大的堆栈跟踪

graph = JanusGraphFactory.open('conf/janusgraph-berkeleyje-es.properties')


gremlin> graph = JanusGraphFactory.open('conf/janusgraph-berkeleyje-es.properties')
12:15:49 WARN  org.janusgraph.diskstorage.es.rest.RestElasticSearchClient  - Unable to determine Elasticsearch server version. Default to FIVE.
java.net.ConnectException: Connection refused
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
    at org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor.processEvent(DefaultConnectingIOReactor.java:171)
    at org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor.processEvents(DefaultConnectingIOReactor.java:145)
    at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor.execute(AbstractMultiworkerIOReactor.java:348)
    at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager.execute(PoolingNHttpClientConnectionManager.java:192)
    at org.apache.http.impl.nio.client.CloseableHttpAsyncClientBase$1.run(CloseableHttpAsyncClientBase.java:64)
    at java.lang.Thread.run(Thread.java:748)
Could not instantiate implementation: org.janusgraph.diskstorage.es.ElasticSearchIndex
Type ':help' or ':h' for help.
Display stack trace? [yN]

Answer 1

从 JanusGraph 0.2.0 开始，您不能将 Elasticsearch 作为嵌入式节点运行，因此您需要启动一个 Elasticsearch 节点。您可以下载并部署自己的 Elasticsearch node ，或者您可以利用 JanusGraph pre-packaged distribution :

bin/janusgraph.sh start

此命令将启动一个 Cassandra 节点、一个 Elasticsearch 节点和一个 Gremlin 服务器。请注意，您需要 Java 开发工具包 (JDK) 才能运行此命令。

或者，您可以从 JanusGraph 预打包分发中启动唯一的 Elasticsearch 节点:

elasticsearch/bin/elasticsearch

这将在前台启动 Elasticsearch。