[TINKERPOP-2436] The gremlin server starts even if all graphs instantiation has failed

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Done
• Affects Version/s: 3.4.8
• Fix Version/s: 3.5.0, 3.4.9
• Component/s: server
• Assignee: Stephen Mallette
• Reporter: Nicolas Trangosi
• Created: 08/Oct/20 14:14
• Updated: 27/Oct/20 16:59
• Resolved: 27/Oct/20 16:57

Description

Sometimes the gremlin server fails to open the graph due to backend failure. 

In this case, gremlin server starts even if could not serve any request as  gremlin-groovy GremlinScriptEngine is not initialized. I think that in this case, gremlin server should stop (and be restarted in a kubernates cluster)
8 Oct 2020 12:35:51,923 8660 [gremlin-server-exec-1] ERROR org.apache.tinkerpop.gremlin.jsr223.DefaultGremlinScriptEngineManager - Could not create GremlinScriptEngine for gremlin-groovy

{{ java.lang.IllegalStateException: javax.script.ScriptException: javax.script.ScriptException: groovy.lang.MissingPropertyException: No such property: graph for class: Script1 }}

08 Oct 2020 12:35:45,228 1965 [main] WARN  org.apache.tinkerpop.gremlin.server.GremlinServer  - Graph [graph] configured at [/etc/opt/janusgraph/janusgraph.properties] could not be instantiated and will not be available in Gremlin Server.  GraphFactory message: GraphFactory could not instantiate this Graph implementation [class org.janusgraph.core.JanusGraphFactory]
08 Oct 2020 12:35:45,228 1965 [main] WARN  org.apache.tinkerpop.gremlin.server.GremlinServer  - Graph [graph] configured at [/etc/opt/janusgraph/janusgraph.properties] could not be instantiated and will not be available in Gremlin Server.  GraphFactory message: GraphFactory could not instantiate this Graph implementation [class org.janusgraph.core.JanusGraphFactory]
 java.lang.RuntimeException: GraphFactory could not instantiate this Graph implementation [class org.janusgraph.core.JanusGraphFactory]
 	at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:81)
 	at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:69)
 	at ...