Cassandra和Titan Graph连接失败

Question

我使用的是datastax社区服务器1.2.13和Titan 0.4.2。如果我使用以下命令

gremlin> g = TitanFactory.open('conf/titan-cassandra-es.properties')
==>titangraph[cassandrathrift:127.0.0.1]

它没有显示任何错误，但当我在java代码中使用以下代码时：

Configuration conf = new BaseConfiguration();
conf.setProperty("storage.backend","cassandra");
conf.setProperty("storage.hostname","127.0.0.1");
conf.setProperty("storage.port","9160");
TitanGraph g = TitanFactory.open(conf);

它显示以下异常：

Exception in thread "main" java.lang.IllegalArgumentException: Could not find implementation class: com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager
    at com.thinkaurelius.titan.diskstorage.Backend.instantiate(Backend.java:347)
    at com.thinkaurelius.titan.diskstorage.Backend.getImplementationClass(Backend.java:367)
    at com.thinkaurelius.titan.diskstorage.Backend.getStorageManager(Backend.java:311)
    at com.thinkaurelius.titan.diskstorage.Backend.<init>(Backend.java:121)
    at com.thinkaurelius.titan.graphdb.configuration.GraphDatabaseConfiguration.getBackend(GraphDatabaseConfiguration.java:1163)
    at com.thinkaurelius.titan.graphdb.database.StandardTitanGraph.<init>(StandardTitanGraph.java:75)
    at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:40)
    at newpackage.TitanTest.main(TitanTest.java:24)

如果我使用conf.setProperty("storage.backend","cassandrathrift");

它显示：

Exception in thread "main" java.lang.IllegalArgumentException: Could not find implementation class: com.thinkaurelius.titan.diskstorage.cassandra.thrift.CassandraThriftStoreManager
    at com.thinkaurelius.titan.diskstorage.Backend.instantiate(Backend.java:347)
    at com.thinkaurelius.titan.diskstorage.Backend.getImplementationClass(Backend.java:367)
    at com.thinkaurelius.titan.diskstorage.Backend.getStorageManager(Backend.java:311)
    at com.thinkaurelius.titan.diskstorage.Backend.<init>(Backend.java:121)
    at com.thinkaurelius.titan.graphdb.configuration.GraphDatabaseConfiguration.getBackend(GraphDatabaseConfiguration.java:1163)
    at com.thinkaurelius.titan.graphdb.database.StandardTitanGraph.<init>(StandardTitanGraph.java:75)
    at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:40)
    at newpackage.TitanTest.main(TitanTest.java:24)

为什么？

Answer 1

这个错误让我认为你没有下载正确的Titan包。如果你没有下载这个titan-all-0.4.2.zip，也许你应该试试那个。