问题
I'm trying to make graph queries via a gremlin-shell to a Cassandra backend (locally or remotely).
I downloaded a stock Gremlin Server distribution and then installed Titan (as described here in the manual-installation).
http://s3.thinkaurelius.com/docs/titan/0.9.0-M1/server.html
I added all the property settings and classpath :
~/gremlin-server-3.0.0.M6$ cat conf/titan-cassandra.properties
gremlin.graph=com.thinkaurelius.titan.core.TitanFactory
storage.backend=cassandrathrift
storage.directory=../db/cassandra
~/gremlin-server-3.0.0.M6$ cat conf/gremlin-server.yaml
host: localhost
port: 8182
threadPoolWorker: 1
gremlinPool: 8
scriptEvaluationTimeout: 30000
serializedResponseTimeout: 30000
channelizer: com.tinkerpop.gremlin.server.channel.WebSocketChannelizer
graphs: {
g: conf/titan-cassandra.properties}
#g: conf/tinkergraph-empty.properties}
plugins:
- aurelius.titan
When I bring up the Gremlin server, I get the following errors (even though gremlin server itself comes up) :
bin/gremlin-server.sh
[INFO] GremlinServer -
\,,,/
(o o)
-----oOOo-(3)-oOOo-----
[INFO] GremlinServer - Configuring Gremlin Server from conf/gremlin-server.yaml
[INFO] MetricManager - Configured Metrics ConsoleReporter configured with report interval=180000ms
[INFO] MetricManager - Configured Metrics CsvReporter configured with report interval=180000ms to fileName=/tmp/gremlin-server-metrics.csv
[INFO] MetricManager - Configured Metrics JmxReporter configured with domain= and agentId=
[INFO] MetricManager - Configured Metrics Slf4jReporter configured with interval=180000ms and loggerName=com.tinkerpop.gremlin.server.Settings$Slf4jReporterMetrics
[WARN] Graphs - Graph [g] configured at [conf/titan-cassandra.properties] could not be instantiated and will not be available in Gremlin Server. GraphFactory message: GraphFactory could not instantiate this Graph implementation [com.thinkaurelius.titan.core.TitanFactory]
java.lang.RuntimeException: GraphFactory could not instantiate this Graph implementation [com.thinkaurelius.titan.core.TitanFactory]
:
:
[INFO] GremlinServer - Initialized Gremlin thread pool. Threads in pool named with pattern gremlin-*
[INFO] ScriptEngines - Loaded nashorn ScriptEngine
[INFO] ScriptEngines - Loaded gremlin-groovy ScriptEngine
[INFO] GremlinServer - Initialized GremlinExecutor and configured ScriptEngines.
[INFO] AbstractChannelizer - Configured application/vnd.gremlin-v1.0+kryo with com.tinkerpop.gremlin.driver.ser.KryoMessageSerializerV1d0
[INFO] AbstractChannelizer - Configured application/vnd.gremlin-v1.0+kryo-stringd with com.tinkerpop.gremlin.driver.ser.KryoMessageSerializerV1d0
[INFO] AbstractChannelizer - Configured application/vnd.gremlin-v1.0+json with com.tinkerpop.gremlin.driver.ser.JsonMessageSerializerGremlinV1d0
[INFO] AbstractChannelizer - Configured application/json with com.tinkerpop.gremlin.driver.ser.JsonMessageSerializerV1d0
[INFO] GremlinServer - Gremlin Server configured with worker thread pool of 1 and boss thread pool of 1
[INFO] GremlinServer - Channel started at port 8182.
Furthermore, when I try to invoke a simple graph operation via the gremlin-shell, I see the following :
bin/gremlin.sh
\,,,/
(o o)
-----oOOo-(3)-oOOo-----
plugin activated: aurelius.titan
plugin activated: tinkerpop.server
plugin activated: tinkerpop.utilities
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/home/appsec/titan-1.0.0-hadoop1/lib/slf4j-log4j12-1.7.5.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/home/appsec/titan-1.0.0-hadoop1/lib/logback-classic-1.1.2.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
20:50:02 INFO org.apache.tinkerpop.gremlin.hadoop.structure.HadoopGraph - HADOOP_GREMLIN_LIBS is set to: /home/appsec/titan-1.0.0-hadoop1/lib
plugin activated: tinkerpop.hadoop
plugin activated: tinkerpop.tinkergraph
gremlin> :remote connect tinkerpop.server conf/remote.yaml
==>Connected - localhost/127.0.0.1:8182
gremlin> GraphOfTheGodsFactory.load(graph)
No such property: graph for class: groovysh_evaluate
Display stack trace? [yN] y
groovy.lang.MissingPropertyException: No such property: graph for class: groovysh_evaluate
gremlin> graph = TitanFactory.open('/home/appsec/gremlin-server-3.0.0.M6/conf/titan-cassandra.properties')
Could not instantiate implementation: com.thinkaurelius.titan.diskstorage.cassandra.thrift.CassandraThriftStoreManager
Display stack trace? [yN] y
java.lang.IllegalArgumentException: Could not instantiate implementation: com.thinkaurelius.titan.diskstorage.cassandra.thrift.CassandraThriftStoreManager
:
:
Caused by: java.net.ConnectException: 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)
... 55 more
回答1:
You should download and use Titan 1.0.0, and make sure that you refer to the Titan 1.0.0 documentation for Titan Server. You don't need to install Gremlin Server separately because it is already bundled with the Titan 1.0.0 distribution.
There was a bug in the Titan 1.0.0 release that has been fixed. You can read more about it on this previous StackOverflow question. In short, you need to update the gremlin-server.yaml to point at a new configuration file titan-cassandra-es-server.properties.
If you're interested in connecting Gremlin Server to Titan (rather than using the server already included with the Titan distrubtion), I've listed some steps in this mailing list post:
# Get Apache TinkerPop's Gremlin Server (Titan 1.0.0 uses TinkerPop 3.0.1)
unzip apache-gremlin-server-3.0.1-incubating-bin.zip
cd apache-gremlin-server-3.0.1-incubating
# This will install Titan-Cassandra as a plugin under ext/titan-cassandra
./bin/gremlin-server.sh -i com.thinkaurelius.titan titan-cassandra 1.0.0
# Copy over some Titan configuration files
# https://gist.github.com/pluradj/8437255e831d2b640b6fea4f815a79c5
# * conf/titan-server.yaml
# * conf/titan-cassandra.properties
# start the server with Titan configuration
./bin/gremlin-server.sh conf/titan-server.yaml
来源：https://stackoverflow.com/questions/39111557/graphfactory-message-graphfactory-could-not-instantiate-this-graph-implementati