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Pre-requisites

1.  Ensure you have the syndeia-cloud-3.6-SP1_janusgraph_setup.zip (or latest service pack) downloaded to your home directory (or home directory's Downloads folder) from the download/license instructions sent out by our team.  

  Note: the .ZIP will pre-create a separate folder for its contents when extracted so there is no need to pre-create a separate folder for it.  

2.  Ensure you satisfy Janusgraph's pre-requisites, ie: have (Open|Oracle)JDK/JRE + Apache Cassandra (& optionally Elasticsearch) installed.  Re. CPU, memory, HD space, etc. this will depend on how much data you expect to store, query, and graph.  

3.  If using a firewall, and JG will be on a separate server from SC, ensure the following port is accessible (consult your local network admin if required): TCP port 8182 (this is the port to listen to for client connections).  

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Downloading & Extracting JanusGraph

1. Ensure you have Janusgraph 1.0.5.3 0 (https://github.com/JanusGraph/janusgraph/releases/tag/v0v1.50.30) downloaded to your home directory (ie: wget https://github.com/JanusGraph/janusgraph/releases/download/v0v1.50.30/janusgraph-full-1.0.50.3.zip)

 Note: JG releases are now split into ones with and without ElasticSearch + Gremlin Server bundled.  The full releases contains ElasticSearch + the Gremlin Server.  

2. Unzip the JanusGraph package to /opt, ie:  sudo unzip janusgraph-1.0.5.30-full.zip -d /opt/

 Note: if you don't have unzip installed, you may need to first install it via yum install unzip

3. Unzip Syndeia Cloud's JanusGraph setup package in your home directory ~/, ie:  unzip syndeia-cloud-3.6-SP1_janusgraph_setup.zip -d ~/

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5. Take ownership of the extracted folder, ie:  sudo chown -R janusgraph:janusgraph /opt/janusgraph-1.0.5.30-full

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$ systemctl status janusgraph
● janusgraph.service
   Loaded: loaded (/etc/systemd/system/janusgraph.service; enabled; vendor preset: enabled)
   Active: active (running) since Wed 2019-04-17 10:21:59 EDT; 7s ago
  Process: 22486 ExecStop=/bin/bash -c /opt/janusgraph-1.0.5.30-full/bin/janusgraph.sh stop (code=exited, status=0/SUCCESS)
 Main PID: 23677 (java)
   CGroup: /system.slice/janusgraph.service
           └─23677 java -server -Djanusgraph.logdir=/opt/janusgraph-1.0.5.30-full/bin/../log -Dlog4j.configuration=conf/gremlin-server/log4j-server.properties -Xms32m -Xmx512m -javaagent:

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9. To view the logs for JanusGraph, use sudo journalctl -eu janusgraph & less /opt/janusgraph-1.0.5.30-full/log/gremlin-server.log.  To follow the log files, you can use sudo journalctl -feu janusgraph & tail -f /opt/janusgraph-1.0.5.30-full/log/gremlin-server.log.  You should see output similar to the following (abridged) text:

 Note, for your convenience you may wish to create a symlink to /opt/janusgraph-1.0.5.30-full/log/ from /var/log, ie: sudo ln -nfs /opt/janusgraph-1.0.5.30-full/log/ /var/log/janusgraph

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18. Three things need to occur:  you will need to change the Snitch (if not already done for Cassandra), alter the keyspace Replication Factor (RF), and run nodetool repair on each node (see https://docs.datastax.com/en/archived/cassandra/3.x/cassandra/operations/opsChangeKSStrategy.html for a summary of the process).

1. Change the Snitch:  see "Switching Snitches":  https://docs.datastax.com/en/archived/cassandra/3.x/cassandra/operations/opsChangeKSStrategy.html

2. Alter the RF:  verify the Cassandra “datacenter” name (default = dc1) from the CLI by running nodetool status and then from Cassandra CQLSH increment the RF for your JanusGraph keyspace(s):
   

   Code Block
   language sql
   ALTER KEYSPACE syndeia_cloud_auth WITH REPLICATION = { 'class' : 'NetworkTopologyStrategy', '<datacenter_name>' : <total_number_of_nodes> }; -- where <datacenter_name> = the name of the datacenter as shown via nodetool status, and <total_number_of_nodes> = total # of nodes (in the cluster) ALTER KEYSPACE syndeia_cloud_store WITH REPLICATION = { 'class' : 'NetworkTopologyStrategy', '<datacenter_name>' : <total_number_of_nodes> }; -- where <datacenter_name> = the name of the datacenter as shown via nodetool status, and <total_number_of_nodes> = total # of nodes (in the cluster) ALTER KEYSPACE syndeia_cloud_confluence WITH REPLICATION = { 'class' : 'NetworkTopologyStrategy', '<datacenter_name>' : <total_number_of_nodes> }; -- where <datacenter_name> = the name of the datacenter as shown via nodetool status, and <total_number_of_nodes> = total # of nodes (in the cluster) ALTER KEYSPACE syndeia_cloud_graph WITH REPLICATION = { 'class' : 'NetworkTopologyStrategy', '<datacenter_name>' : <total_number_of_nodes> }; -- where <datacenter_name> = the name of the datacenter as shown via nodetool status, and <total_number_of_nodes> = total # of nodes (in the cluster) ALTER KEYSPACE syndeia_cloud_graph_config WITH REPLICATION = { 'class' : 'NetworkTopologyStrategy', '<datacenter_name>' : <total_number_of_nodes> }; -- where <datacenter_name> = the name of the datacenter as shown via nodetool status, and <total_number_of_nodes> = total # of nodes (in the cluster)

   
   

3. Run nodetool repair:  Run nodetool repair --full <keyspace_name> on each node (for more details see https://docs.datastax.com/en/dse/5.1/cql/cql/cql_using/cqlUpdateKeyspaceRF.html)

19. Follow  "Things to Consider in a Multi-Node JanusGraph Cluster" https://docs.janusgraph.org/1.0.3.10/things-to-consider-in-a-multi-node-janusgraph-cluster.html

20. Repeat steps 14 ~ 19 for each additional cluster node.

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$ ./gremlin.sh 

         \,,,/
         (o o)
-----oOOo-(3)-oOOo-----
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/opt/janusgraph-1.0.5.30-full/lib/slf4j-log4j12-1.7.12.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/opt/janusgraph-1.0.5.30-full/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]
plugin activated: janusgraph.imports
plugin activated: tinkerpop.server
plugin activated: tinkerpop.utilities
20:19:16 WARN  org.apache.hadoop.util.NativeCodeLoader  - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
plugin activated: tinkerpop.hadoop
plugin activated: tinkerpop.spark
plugin activated: tinkerpop.tinkergraph
gremlin> 

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:remote connect tinkerpop.server conf/remote.yaml session
:remote console
graph = ConfiguredGraphFactory.open('syndeia_cloud_graph');
// should return: ==>standardjanusgraph[cql:[cassandra.mydomain.com]]
g = graph.traversal();
g.V();
g.E();

The last 2 commands above should not return any results since the graph (syndeia_cloud_graph) is empty - no vertices or edges.

21.4.  Type :quit   

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