Kann JanusGraph nicht mit lokaler Cassandra auf Mac verbinden

Question

Ich habe Cassandra 3.11.1 installiert und läuft auf meinem Mac (OS X 10.11.6). Laufende cqlsh in Terminal druckt die folgende Meldung:

Connected to Test Cluster at 127.0.0.1:9042. 
[cqlsh 5.0.1 | Cassandra 3.11.1 | CQL spec 3.4.4 | Native protocol v4] 
Use HELP for help. 
cqlsh> 

So sollte Cassandra in Ordnung sein zu arbeiten. Mit Hilfe des Java-API, versuche ich ein Graph zu schaffen mit dem Cassandra Speicher-Backend dieser Zeilen mit:

JanusGraph graph = JanusGraphFactory.build() 
    .set("storage.backend", "cassandra") 
    .set("storage.hostname", "127.0.0.1") 
    .open(); 

jedoch, dass die folgenden Ausnahme verursachen:

java.lang.IllegalArgumentException: Could not instantiate implementation: org.janusgraph.diskstorage.cassandra.astyanax.AstyanaxStoreManager 
    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:97) 
    at org.janusgraph.core.JanusGraphFactory$Builder.open(JanusGraphFactory.java:152) 
    at engineering.divine.core.GraphFactory.cassandraGraph(GraphFactory.java:395) 
    at engineering.divine.core.GraphFactory.graph(GraphFactory.java:301) 
    at engineering.divine.core.GraphFactory.getDefault(GraphFactory.java:102) 
    at engineering.divine.repository.Repository.listRepositoriesToUpdate(Repository.java:130) 
    at engineering.divine.daemon.RepositoryAnalysisDaemon.run(RepositoryAnalysisDaemon.java:24) 
    at java.util.concurrent.Executors$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) 
    ... 18 more 
Caused by: org.janusgraph.diskstorage.TemporaryBackendException: Temporary failure in storage backend 
    at org.janusgraph.diskstorage.cassandra.astyanax.AstyanaxStoreManager.ensureKeyspaceExists(AstyanaxStoreManager.java:590) 
    at org.janusgraph.diskstorage.cassandra.astyanax.AstyanaxStoreManager.<init>(AstyanaxStoreManager.java:302) 
    ... 23 more 
Caused by: com.netflix.astyanax.connectionpool.exceptions.PoolTimeoutException: PoolTimeoutException: [host=127.0.0.1(127.0.0.1):9160, latency=10003(10003), attempts=1]Timed out waiting for connection 
    at com.netflix.astyanax.connectionpool.impl.SimpleHostConnectionPool.waitForConnection(SimpleHostConnectionPool.java:231) 
    at com.netflix.astyanax.connectionpool.impl.SimpleHostConnectionPool.borrowConnection(SimpleHostConnectionPool.java:198) 
    at com.netflix.astyanax.connectionpool.impl.RoundRobinExecuteWithFailover.borrowConnection(RoundRobinExecuteWithFailover.java:84) 
    at com.netflix.astyanax.connectionpool.impl.AbstractExecuteWithFailoverImpl.tryOperation(AbstractExecuteWithFailoverImpl.java:117) 
    at com.netflix.astyanax.connectionpool.impl.AbstractHostPartitionConnectionPool.executeWithFailover(AbstractHostPartitionConnectionPool.java:352) 
    at com.netflix.astyanax.thrift.ThriftClusterImpl.executeSchemaChangeOperation(ThriftClusterImpl.java:146) 
    at com.netflix.astyanax.thrift.ThriftClusterImpl.internalCreateKeyspace(ThriftClusterImpl.java:321) 
    at com.netflix.astyanax.thrift.ThriftClusterImpl.addKeyspace(ThriftClusterImpl.java:294) 
    at org.janusgraph.diskstorage.cassandra.astyanax.AstyanaxStoreManager.ensureKeyspaceExists(AstyanaxStoreManager.java:585) 
    ... 24 more 

Ich habe Ports auch schon versucht 127.0.0.1:9160, 127.0.0.1:9042, 127.0.0.1:7000 und 127.0.0.1:7199. Was fehlt mir hier?

Answer 1

Das Backend cassandra und cassandrathrift verwendet Thrift, das in Cassandra 3.11.1 nicht standardmäßig aktiviert ist. Sie können Thrift entweder im cassandra.yaml aktivieren, indem Sie start_rpc: true oder in der Befehlszeile mit nodetool enablethrift festlegen.

Wenn Sie JanusGraph 0.2.0 oder höher verwenden, können Sie den CQL-Speicheradapter verwenden, der das native CQL-Protokoll verwendet. Sie können dies tun, indem Sie storage.backend auf cql setzen. Lesen Sie mehr über die CQL-Optionen im JanusGraph configuration reference.