问题
I'm trying to run ./bin/gremlin-server.sh ./conf/gremlin-server/gremlin-server.yaml
I can see cassandra in process list but the client wont connect, i got this error all the time:
263 [main] INFO org.apache.tinkerpop.gremlin.server.GremlinServer - Configuring Gremlin Server from ./conf/gremlin-server/gremlin-server.yaml 400 [main] INFO org.apache.tinkerpop.gremlin.server.util.MetricManager - Configured Metrics ConsoleReporter configured with report interval=180000ms 402 [main] INFO org.apache.tinkerpop.gremlin.server.util.MetricManager - Configured Metrics CsvReporter configured with report interval=180000ms to fileName=/tmp/gremlin-server-metrics.csv 484 [main] INFO org.apache.tinkerpop.gremlin.server.util.MetricManager - Configured Metrics JmxReporter configured with domain= and agentId= 488 [main] INFO org.apache.tinkerpop.gremlin.server.util.MetricManager - Configured Metrics Slf4jReporter configured with interval=180000ms and loggerName=org.apache.tinkerpop.gremlin.server.Settings$Slf4jReporterMetrics 1085 [main] WARN org.apache.tinkerpop.gremlin.server.GremlinServer - Graph [graph] configured at [conf/gremlin-server/janusgraph-cassandra-es-server.properties] could not be instantiated and will not be available in Gremlin Server. GraphFactory message: GraphFactory could not instantiate this Graph implementation [class org.janusgraph.core.JanusGraphFactory] java.lang.RuntimeException: GraphFactory could not instantiate this Graph implementation [class org.janusgraph.core.JanusGraphFactory] at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:82) at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:70) at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:104) at org.apache.tinkerpop.gremlin.server.util.DefaultGraphManager.lambda$new$0(DefaultGraphManager.java:57) at java.util.LinkedHashMap$LinkedEntrySet.forEach(LinkedHashMap.java:671) at org.apache.tinkerpop.gremlin.server.util.DefaultGraphManager.(DefaultGraphManager.java:55) 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.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.(ServerGremlinExecutor.java:111) at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.(ServerGremlinExecutor.java:90) at org.apache.tinkerpop.gremlin.server.GremlinServer.(GremlinServer.java:110) at org.apache.tinkerpop.gremlin.server.GremlinServer.main(GremlinServer.java:354) 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) ... 13 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.(GraphDatabaseConfiguration.java:1353) at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:107) at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:87) ... 18 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) ... 23 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.(CassandraThriftStoreManager.java:198) ... 28 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:110) at org.janusgraph.diskstorage.cassandra.thrift.thriftpool.CTConnectionFactory.makeObject(CTConnectionFactory.java:74) at org.janusgraph.diskstorage.cassandra.thrift.thriftpool.CTConnectionFactory.makeObject(CTConnectionFactory.java:43) at org.apache.commons.pool.impl.GenericKeyedObjectPool.borrowObject(GenericKeyedObjectPool.java:1220) at org.janusgraph.diskstorage.cassandra.thrift.CassandraThriftStoreManager.getCassandraPartitioner(CassandraThriftStoreManager.java:216) ... 29 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) ... 35 more 1089 [main] INFO org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor - Initialized Gremlin thread pool. Threads in pool named with pattern gremlin-* 1877 [main] INFO org.apache.tinkerpop.gremlin.groovy.engine.ScriptEngines - Loaded gremlin-groovy ScriptEngine 2971 [main] WARN org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor - Could not initialize gremlin-groovy ScriptEngine with scripts/empty-sample.groovy as script could not be evaluated - javax.script.ScriptException: groovy.lang.MissingPropertyException: No such property: graph for class: Script1 2971 [main] INFO org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor - Initialized GremlinExecutor and preparing GremlinScriptEngines instances. 3043 [main] INFO org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor - Initialized gremlin-groovy GremlinScriptEngine and registered metrics 3094 [main] INFO org.apache.tinkerpop.gremlin.server.op.OpLoader - Adding the standard OpProcessor. 3095 [main] INFO org.apache.tinkerpop.gremlin.server.op.OpLoader - Adding the control OpProcessor. 3099 [main] INFO org.apache.tinkerpop.gremlin.server.op.OpLoader - Adding the session OpProcessor. 3549 [main] INFO org.apache.tinkerpop.gremlin.server.op.OpLoader - Adding the traversal OpProcessor. 3567 [main] INFO org.apache.tinkerpop.gremlin.server.op.traversal.TraversalOpProcessor - Initialized cache for TraversalOpProcessor with size 1000 and expiration time of 600000 ms 3676 [main] INFO org.apache.tinkerpop.gremlin.server.AbstractChannelizer - Configured application/vnd.gremlin-v1.0+gryo with org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0 3679 [main] INFO org.apache.tinkerpop.gremlin.server.AbstractChannelizer - Configured application/vnd.gremlin-v1.0+gryo-lite with org.apache.tinkerpop.gremlin.driver.ser.GryoLiteMessageSerializerV1d0 3680 [main] INFO org.apache.tinkerpop.gremlin.server.AbstractChannelizer - Configured application/vnd.gremlin-v1.0+gryo-stringd with org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0 3685 [main] WARN org.apache.tinkerpop.gremlin.server.AbstractChannelizer - Could not instantiate configured serializer class - org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerGremlinV1d0 - it will not be available. There is no graph named [graph] configured to be used in the useMapperFromGraph setting 3730 [main] WARN org.apache.tinkerpop.gremlin.server.AbstractChannelizer - Could not instantiate configured serializer class - org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerGremlinV2d0 - it will not be available. There is no graph named [graph] configured to be used in the useMapperFromGraph setting 3732 [main] WARN org.apache.tinkerpop.gremlin.server.AbstractChannelizer - Could not instantiate configured serializer class - org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV1d0 - it will not be available. There is no graph named [graph] configured to be used in the useMapperFromGraph setting 3818 [gremlin-server-boss-1] INFO org.apache.tinkerpop.gremlin.server.GremlinServer - Gremlin Server configured with worker thread pool of 1, gremlin pool of 4 and boss thread pool of 1. 3818 [gremlin-server-boss-1] INFO org.apache.tinkerpop.gremlin.server.GremlinServer - Channel started at port 8182.
来源：https://stackoverflow.com/questions/45477719/janusgraph-error-while-tring-to-connect-with-backend