Question

我尝试启动JanusGraph，我遇到了TinkerPop gremlin服务器的问题。我尝试了“release（0.1.1）”和“from source（0.2.0）”版本。当我运行/bin/janusgraph.sh start时没有错误，但我无法使用我的应用程序连接到gremlin。当我启动从Apache站点下载的TinkerPop版本时，我没有连接问题。我认为问题在于配置文件。 Apache版本使用tinkergraph-empty.properties，JanusGraph版本：janusgraph-cassandra-es-server.properties（当然，我想使用Cassandra）。

使用Cassandra配置执行gremlin-server.sh的结果不会返回任何错误，但会返回警告：

718  [main] WARN  org.apache.tinkerpop.gremlin.server.GremlinServer  - Graph [graph] configured at [conf/gremlin-server/janusgraph-cassandra-es-server.properties] could not be instantiated and will not be available in Gremlin Server.  GraphFactory message: GraphFactory could not instantiate this Graph implementation [class org.janusgraph.core.JanusGraphFactory]
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 org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:104)
    at org.apache.tinkerpop.gremlin.server.GraphManager.lambda$new$0(GraphManager.java:55)
    at java.util.LinkedHashMap$LinkedEntrySet.forEach(LinkedHashMap.java:671)
    at org.apache.tinkerpop.gremlin.server.GraphManager.<init>(GraphManager.java:53)
    at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.<init>(ServerGremlinExecutor.java:83)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.<init>(GremlinServer.java:110)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.main(GremlinServer.java:344)
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)
    ... 8 more
Caused by: java.lang.IllegalArgumentException: Could not instantiate implementation: org.janusgraph.diskstorage.cassandra.thrift.CassandraThriftStoreManager
    at org.janusgraph.util.system.ConfigurationUtil.instantiate(ConfigurationUtil.java:69)
    at org.janusgraph.diskstorage.Backend.getImplementationClass(Backend.java:477)
    at org.janusgraph.diskstorage.Backend.getStorageManager(Backend.java:409)
    at org.janusgraph.graphdb.configuration.GraphDatabaseConfiguration.<init>(GraphDatabaseConfiguration.java:1353)
    at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:107)
    at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:87)
    ... 13 more
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:423)
    at org.janusgraph.util.system.ConfigurationUtil.instantiate(ConfigurationUtil.java:58)
    ... 18 more
Caused by: org.janusgraph.diskstorage.TemporaryBackendException: Temporary failure in storage backend
    at org.janusgraph.diskstorage.cassandra.thrift.CassandraThriftStoreManager.getCassandraPartitioner(CassandraThriftStoreManager.java:219)
    at org.janusgraph.diskstorage.cassandra.thrift.CassandraThriftStoreManager.<init>(CassandraThriftStoreManager.java:198)
    ... 23 more
Caused by: org.apache.thrift.transport.TTransportException: java.net.ConnectException: Connection refused (Connection refused)
    at org.apache.thrift.transport.TSocket.open(TSocket.java:185)
    at org.apache.thrift.transport.TFramedTransport.open(TFramedTransport.java:81)
    at org.janusgraph.diskstorage.cassandra.thrift.thriftpool.CTConnectionFactory.makeRawConnection(CTConnectionFactory.java:102)
    at org.janusgraph.diskstorage.cassandra.thrift.thriftpool.CTConnectionFactory.makeObject(CTConnectionFactory.java:66)
    at org.janusgraph.diskstorage.cassandra.thrift.thriftpool.CTConnectionFactory.makeObject(CTConnectionFactory.java:35)
    at org.apache.commons.pool.impl.GenericKeyedObjectPool.borrowObject(GenericKeyedObjectPool.java:1220)
    at org.janusgraph.diskstorage.cassandra.thrift.CassandraThriftStoreManager.getCassandraPartitioner(CassandraThriftStoreManager.java:216)
    ... 24 more
Caused by: java.net.ConnectException: Connection refused (Connection refused)
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at org.apache.thrift.transport.TSocket.open(TSocket.java:180)
    ... 30 more

如何在没有警告的情况下使用Cassanda启动JanusGraph？

Answer 1

启动Cassandra时遇到问题，您可以通过运行来观察：

bin/nodetool enablethrift

as @Ashraful Islam建议。

需要在conf/cassandra/cassandra-env.sh中取消注释以下行（我将地址设置为localhost）：

JVM_OPTS="$JVM_OPTS -Djava.rmi.server.hostname=127.0.0.1"

Answer 2

启用Cassandra的Thrift服务器

使用以下命令在cassandra中启用thrift

nodetool enablethrift

无法从JanusGraps启动gremlin服务器（GraphFactory警告）

2 个答案: