I am trying to setup Titan (server 0.4.4) with Cassandra embedded. My environment is Windows 8.1 x64 + Cygwin. The install is in E:\titan-server-0.4.4.
I also need to be able to access this setup via Rexster.
For my configuration, I referred to https://github.com/thinkaurelius/titan/wiki/Using-Cassandra.
I've modified graph configuration
E:\titan-server-0.4.4\conf\rexster-cassandra-es.xml
graph section to
<graph>
<graph-name>graph</graph-name>
<graph-type>com.thinkaurelius.titan.tinkerpop.rexster.TitanGraphConfiguration</graph-type>
<graph-read-only>false</graph-read-only>
<properties>
<auto-type>none</auto-type>
<storage.batch-loading>true</storage.batch-loading>
<storage.cassandra-config-dir>file:///E:\titan-server-0.4.4\conf\cassandra.yaml</storage.cassandra-config-dir>
<storage.backend>embeddedcassandra</storage.backend>
<storage.index.search.backend>elasticsearch</storage.index.search.backend>
<storage.index.search.directory>../db/es</storage.index.search.directory>
<storage.index.search.client-only>false</storage.index.search.client-only>
<storage.index.search.local-mode>true</storage.index.search.local-mode>
</properties>
<extensions>
<allows>
<allow>tp:gremlin</allow>
</allows>
</extensions>
</graph>
(Note
<auto-type>none</auto-type>
<storage.batch-loading>true</storage.batch-loading>
these are to allow bulk insert. The whole idea of embedded Cassandra is to improve the insertion performance.)
However, when I tried starting the service with ./bin/titan.sh -v start, the start failed with:
org.apache.cassandra.exceptions.ConfigurationException: localhost/127.0.0.1:7000 is in use by another process. Change listen_address:storage_port in cassandra.yaml to values that do not conflict with other services at org.apache.cassandra.net.MessagingService.getServerSocket(MessagingService.java:439) at org.apache.cassandra.net.MessagingService.listen(MessagingService.java:387) at org.apache.cassandra.service.StorageService.joinTokenRing(StorageService.java:549) at org.apache.cassandra.service.StorageService.initServer(StorageService.java:514) at org.apache.cassandra.service.StorageService.initServer(StorageService.java:411) at org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:278) at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:366) at org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:409) at com.thinkaurelius.titan.diskstorage.cassandra.utils.CassandraDaemonWrapper.start(CassandraDaemonWrapper.java:51) at com.thinkaurelius.titan.diskstorage.cassandra.embedded.CassandraEmbeddedStoreManager.(CassandraEmbeddedStoreManager.java:102) 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:408) at com.thinkaurelius.titan.diskstorage.Backend.instantiate(Backend.java:344) at com.thinkaurelius.titan.diskstorage.Backend.getImplementationClass(Backend.java:367) at com.thinkaurelius.titan.diskstorage.Backend.getStorageManager(Backend.java:311) at com.thinkaurelius.titan.diskstorage.Backend.(Backend.java:121) at com.thinkaurelius.titan.graphdb.configuration.GraphDatabaseConfiguration.getBackend(GraphDatabaseConfiguration.java:1173) at com.thinkaurelius.titan.graphdb.database.StandardTitanGraph.(StandardTitanGraph.java:75) at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:40) at com.thinkaurelius.titan.tinkerpop.rexster.TitanGraphConfiguration.configureGraphInstance(TitanGraphConfiguration.java:25) at com.tinkerpop.rexster.config.GraphConfigurationContainer.getGraphFromConfiguration(GraphConfigurationContainer.java:119) at com.tinkerpop.rexster.config.GraphConfigurationContainer.(GraphConfigurationContainer.java:54) at com.tinkerpop.rexster.server.XmlRexsterApplication.reconfigure(XmlRexsterApplication.java:99) at com.tinkerpop.rexster.server.XmlRexsterApplication.(XmlRexsterApplication.java:47) at com.tinkerpop.rexster.Application.(Application.java:96) at com.tinkerpop.rexster.Application.main(Application.java:188) localhost/127.0.0.1:7000 is in use by another process. Change listen_address:storage_port in cassandra.yaml to values that do not conflict with other services
I tried mofiying the ports in "E:\titan-server-0.4.4\conf\cassandra.yaml", but after some investigation, I've realized that the port is actually taken by Cassandra itself, i.e. in this configuration, ./bin/titan.sh -v start tries to start multiple instances of Cassandra?!
I copied cassandra.yaml to cassandra2.yaml with different port settings and specified path to cassandra2.yaml in the graph configuration xml. After this, I was able to start Rexster with Titan and Cassandra embedded by running ./bin/titan.sh -v start.
However, I strongly believe that something is wrong with this setup. Besides, the system does not behave well - sometime I cannot save a graph in Rexster's (Web based) Gremlin shell by using g.commit() - the command succeeds, but nothing gets saved.
So is the right way to run Titan with Cassandra embedded? What is the configuration supposed to be?
