Titan + Hbase REST API

[Tommy]

Hi, not easy for usint Titan + Hbase REST API. Is there someone has built this graph database successfully?

I followed the installation tutoral step by step, and used hbase as storage backend in gremlin shell perfect. Command below:

graph = TitanFactory.open('conf/titan-hbase-es.properties')

But when I ran `bin/gremlin-server.sh conf/gremlin-server-hbase.properties`. Something wrong with the following log

566  [main] WARN  org.apache.tinkerpop.gremlin.server.GremlinServer  - Graph [graph] configured at [conf/titan-hbase.properties] could not be instantiated and will not be available in Gremlin Server.  GraphFactory message: Configuration must contain a valid 'gremlin.graph' setting

java.lang.RuntimeException: Configuration must contain a valid 'gremlin.graph' setting

        at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:57)

        at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:104)

        at org.apache.tinkerpop.gremlin.server.GraphManager.lambda$new$27(GraphManager.java:50)

        at java.util.LinkedHashMap$LinkedEntrySet.forEach(LinkedHashMap.java:671)

        at org.apache.tinkerpop.gremlin.server.GraphManager.<init>(GraphManager.java:48)

        at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.<init>(ServerGremlinExecutor.java:94)

        at org.apache.tinkerpop.gremlin.server.GremlinServer.<init>(GremlinServer.java:88)

        at org.apache.tinkerpop.gremlin.server.GremlinServer.main(GremlinServer.java:290)

569  [main] INFO  org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor  - Initialized Gremlin thread pool.  Threads in pool named with pattern gremlin-*

943  [main] INFO  org.apache.tinkerpop.gremlin.groovy.engine.ScriptEngines  - Loaded nashorn ScriptEngine

1371 [main] INFO  org.apache.tinkerpop.gremlin.groovy.engine.ScriptEngines  - Loaded gremlin-groovy ScriptEngine

2102 [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

2103 [main] INFO  org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor  - Initialized GremlinExecutor and configured ScriptEngines.

2156 [main] WARN  org.apache.tinkerpop.gremlin.server.AbstractChannelizer  - Could not instantiate configured serializer class - org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0 - it will not be available. There is no graph named [graph] configured to be used in the useMapperFromGraph setting

2158 [main] INFO  org.apache.tinkerpop.gremlin.server.AbstractChannelizer  - Configured application/vnd.gremlin-v1.0+gryo-stringd with org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0

2301 [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

2302 [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

And I add a configuration in `conf/titan-hbase.properties`:

gremlin.graph=com.thinkaurelius.titan.core.TitanFactory

Then restart titan, and error occurred:

1562 [main] INFO  org.apache.zookeeper.ZooKeeper  - Initiating client connection, connectString=127.0.0.1:2181 sessionTimeout=90000 watcher=hconnection-0x1e16c0aa, quorum=127.0.0.1:2181, baseZNode=/hbase

1594 [main] INFO  org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper  - Process identifier=hconnection-0x1e16c0aa connecting to ZooKeeper ensemble=127.0.0.1:2181

1596 [main-SendThread(127.0.0.1:2181)] INFO  org.apache.zookeeper.ClientCnxn  - Opening socket connection to server 127.0.0.1/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)

1606 [main-SendThread(127.0.0.1:2181)] INFO  org.apache.zookeeper.ClientCnxn  - Socket connection established to 127.0.0.1/127.0.0.1:2181, initiating session

1616 [main-SendThread(127.0.0.1:2181)] INFO  org.apache.zookeeper.ClientCnxn  - Session establishment complete on server 127.0.0.1/127.0.0.1:2181, sessionid = 0x154aa86d1920409, negotiated timeout = 40000

1786 [main] INFO  org.apache.zookeeper.ZooKeeper  - Initiating client connection, connectString=127.0.0.1:2181 sessionTimeout=90000 watcher=hconnection-0xd771cc9, quorum=127.0.0.1:2181, baseZNode=/hbase

1787 [main-SendThread(127.0.0.1:2181)] INFO  org.apache.zookeeper.ClientCnxn  - Opening socket connection to server 127.0.0.1/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)

1788 [main-SendThread(127.0.0.1:2181)] INFO  org.apache.zookeeper.ClientCnxn  - Socket connection established to 127.0.0.1/127.0.0.1:2181, initiating session

1789 [main] INFO  org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper  - Process identifier=hconnection-0xd771cc9 connecting to ZooKeeper ensemble=127.0.0.1:2181

1790 [main-SendThread(127.0.0.1:2181)] INFO  org.apache.zookeeper.ClientCnxn  - Session establishment complete on server 127.0.0.1/127.0.0.1:2181, sessionid = 0x154aa86d192040a, negotiated timeout = 40000

1793 [main] INFO  org.apache.zookeeper.ZooKeeper  - Initiating client connection, connectString=127.0.0.1:2181 sessionTimeout=90000 watcher=catalogtracker-on-hconnection-0xd771cc9, quorum=127.0.0.1:2181, baseZNode=/hbase

1794 [main-SendThread(127.0.0.1:2181)] INFO  org.apache.zookeeper.ClientCnxn  - Opening socket connection to server 127.0.0.1/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)

1795 [main-SendThread(127.0.0.1:2181)] INFO  org.apache.zookeeper.ClientCnxn  - Socket connection established to 127.0.0.1/127.0.0.1:2181, initiating session

1795 [main] INFO  org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper  - Process identifier=catalogtracker-on-hconnection-0xd771cc9 connecting to ZooKeeper ensemble=127.0.0.1:2181

1798 [main-SendThread(127.0.0.1:2181)] INFO  org.apache.zookeeper.ClientCnxn  - Session establishment complete on server 127.0.0.1/127.0.0.1:2181, sessionid = 0x154aa86d192040b, negotiated timeout = 40000

Does someone know what happened?

Thanks!

[Jason Plurad]

Did you confirm that you can connect to Titan with you titan-hbase.properties from the Gremlin Console? Can you post that file?

For HBase are you running a standalone Zookeeper or embedded? Is Zookeeper listening on 2181? Are you running Apache HBase from zip or a distribution?

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[Tommy]

Yes. I can connect to Titan with titan-hbase.properties from the Gremlin Console.

This is all configuration in my titan-hbase.properties:

storage.backend=hbase
storage.hbase.tablename=titan
storage.hostname=127.0.0.1
cache.db-cache = true
cache.db-cache-clean-wait = 20
cache.db-cache-time = 180000
cache.db-cache-size = 0.5
# gremlin.graph=com.thinkaurelius.titan.core.TitanFactory

I am running a standalone HBase. Shall I run a standalone Zookeeper?

The version of Titan is 1.0.0 and HBase is `hbase-1.1.4-bin.tar.gz`

在 2016年5月14日星期六 UTC+8上午1:28:25，Jason Plurad写道：

[한세윤]

I got same issue.

Did you solved the problem?

2016년 5월 14일 토요일 오전 1시 19분 38초 UTC+9, Tommy 님의 말:

[Jason Plurad]

Oh, those aren't real errors... they are logged as INFO. You can adjust the logging settings in $TITAN_HOME/conf/gremlin-server/log4j-server.properties:

log4j.logger.org.apache.zookeeper=WARN
log4j.logger.org.apache.hadoop.hbase.client=WARN
log4j.logger.org.apache.hadoop.hbase.zookeeper=WARN

-- Jason

[Jason Plurad]

Also, watch out on the versions... Titan 1.0.0 isn't built against HBase 1.1.4, so it may not be compatible, see the version compatibility matrix